Page 1 :
Directorate of Education GNCT of Delhi, Subject: English, Worksheet: 72, Class: X, Name of Student………………………, , Date: 24/01/2022, Name of Class Teacher…...………….., , Read the passage given below and answer the questions that follow., Mount Vesuvius, a volcano located between the ancient Italian cities of Pompeii and Herculaneum, has received much attention because of, its frequent and destructive eruptions. The most famous of these eruptions occurred in A.D. 79., The volcano had been inactive for centuries. There was little warning of the coming eruption, although one account unearthed by, archaeologists says that a hard rain and a strong wind had disturbed the celestial calm during the preceding night. Early the next morning, the, volcano poured a huge river of molten rock down upon Herculaneum, completely burying the city and filling the harbor with coagulated, lava., Meanwhile, on the other side of the mountain, cinders, stone and ash rained down on Pompeii. Sparks from the burning ash ignited the, combustible rooftops quickly. Large portions of the city were destroyed in the conflagration. Fire, however, was not the only cause of, destruction. Poisonous sulfuric gases saturated the air. These heavy gases were not buoyant in the atmosphere and therefore sank toward the, earth and suffocated people., Over the years, excavations of Pompeii and Herculaneum have revealed a great deal about the behavior of the volcano. By analyzing data,, much as a zoologist dissects an animal specimen, scientists have concluded that the eruption changed large portions of the area’s geography., For instance, it turned the Sarno River from its course and raised the level of the beach along the Bay of Naples. Meteorologists studying, these events have also concluded that Vesuvius caused a huge tidal wave that affected the world’s climate., In addition to making these investigations, archaeologists have been able to study the skeletons of victims by using distilled water to wash, away the volcanic ash. By strengthening the brittle bones with acrylic paint, scientists have been able to examine the skeletons and draw, conclusions about the diet and habits of the residents. Finally, the excavations at both Pompeii and Herculaneum have yielded many, examples of classical art, such as jewelry made of bronze, which is an alloy of copper and tin. The eruption of Mount Vesuvius and its tragic, consequences have provided everyone with a wealth of data about the effects that volcanoes can have on the surrounding area. Today,, volcanologists can locate and predict eruptions, saving lives and preventing the destruction of other cities and cultures., 1. Herculaneum and its harbor were buried under _________ lava., a), liquid, b), solid, c), flowing, d), gas, e), Answer not available, 2. The poisonous gases were not _________ in the air., a), able to float, b), visible, c), able to evaporate, d), invisible, e), able to condense, 3. Scientists analyzed data about Vesuvius in the same way that a zoologist _________ a specimen., a), describes in detail, b), studies by cutting apart, c), photographs, d), chart, e), Answer not available, 4. _________ have concluded that the volcanic eruption caused a tidal wave., a), Scientists who study oceans, b), Scientists who study atmospheric conditions, c), Scientists who study ash, d), Scientists who study animal behavior, e), Answer not available in article, 5. Scientists have used _________ water to wash away volcanic ash from the skeletons of victims., a), bottled, b), volcanic, c), purified, d), sea, e), fountain, , COVID appropriate behaviour (CAB) message:, Keep maintaining physical distance of 6 feet or 2 yards.

Page 3 :
Directorate of Education, GNCT of Delhi, Subject: Mathematics, Worksheet: 74, Date: 24/01/2022, Class: X, Name of Student………………, Name of Class Teacher…...…………….., , Statistics: An Introduction, Data in Statistics :, Collection of meaningful, informations, , Statistics: A branch of mathematics dealing with the collection,, analysis, interpretation and presentation of masses of numerical data., Measures of Central Tendency, , Two types of Data: Ungrouped data and Grouped data, , Measure of Central Tendency: It means a centre, or location of the distribution. The most, common measures of central tendency are the, arithmetic mean, the median and the mode., , Range = Highest observation – Lowest observation, h = Class Size = Upper Limit – Lower Limit, , If class interval is discontinuous then make it, continuous by subtracting 0.5 from lower, limit and adding 0.5 to upper limit., , Empirical relationship between three measures, of central tendency:, Mode = 3 Median – 2 Mean, , Mean, Mean → Average of the data, Direct Method =, , Mode, , Median, Median → Middle, Value, Median =, , ∑, ∑, , Assumed Mean Method (Shortcut method) → a +, , ∑, ∑, , +, , (, , . ), , Step Deviation Method, , Median Class: A class interval is which cumulative frequency is, greater than and nearest to, , ×, , Mode → Maximum, number of, observations, Mode =, +(, , (, , ), ), , ×, , xi = Mid-point = Class mark, , = ( ∑!" ), , =, , Modal Class: A class interval having maximum frequency., , Now Answer These, 1. Class mark = ½ ( ________________________, , +, , ________________________ )., , 2. A class interval, whose frequency is maximum, is called, , _____________________., , 3. The Range of the observations 255,125,130,160,185,170,103 is _______________ ., 4. The Empirical relationship between three measures of central tendency is ___________________., 5. The difference between upper limit and lower limit is known as ________________., 6. The mean of first 5 prime numbers is _____________________________________., , COVID appropriate behaviour (CAB) message:, To stay safe in the fight against COVID-19, wear a mask

Page 4 :
Directorate of Education ,GNCT of Delhi, Subject: Science, Worksheet:74, Date:24/01/2022, Class: X, Name of Student…………………, Name of Class Teacher…...…………….., Heredity And Evolution, Sex determination in Humans, Humans have 23 pairs of chromosomes (total 46) in each of their, cells. Out of these 23 pairs, 22 pairs are called Autosomes and, one pair is of sex chromosomes which determines the sex of an, individual. All pairs of human chromosomes are perfect pair except, the pair of sex chromosomes in human males. Females are, homozygous for these sex chromosomes as they have both same,, viz., XX; on the other hand males are heterozygous because they, have one shorter chromosome Y along with X, i.e., XY. This, shows that females can produce only one type of gamete, which, is, X , whereas, males can produce two types of gametes, which, are, X and Y., During zygote formation a child always gets X chromosome from the, mother. But the sex of child is determined by the chromosome, inherited from father. A child who inherits an X chromosome from her, father will be a girl, and one who inherits a Y chromosome from him, will be a boy. Thus, the sex of a child is dependent only on the, , sperm contributed by the father and not on ovum contributed, by mother. Moreover, the probability percentage of having a, male or a female child is 50- 50%., Let us practice:, 1. In a few reptiles, the, temperature at which fertilized, eggs are kept determines, whether the animals developing, in the eggs will be male or, female., 2. In some animals, such as, snails, individuals can change, sex, indicating that sex is not, always genetically determined., , 1. A woman is being held responsible for giving birth to a female, child in our society. Would you agree with the statement? Why/, why not?, 2. How would we determine the probability of male and female, offsprings in humans. Show with the help of a cross., 3. AMNIOCENTESIS is a technique to determine the sex of a child, before birth. This technique is banned in our country. Why do you, think that is so?, 4. Sex is not always genetically determined. Do you agree with the, statement. Justify with an example., 5. Complete the picture:, , 3. In birds, females are, heterozygous, i.e., they have, ZW chromosomes whereas, males have ZZ., 4. In some insects males have, only one sex chromosome, instead of a pair., , COVID appropriate behaviour (CAB) message:, To stay safe in the fight against COVID-19, wear a mask

Page 5 :
Directorate of Education GNCT of Delhi, Subject: Social Science, Worksheet: 72, Date: 24/01/2022, Class: X Name of Student……………. Name of Class Teacher…...……, Chapter- 3: Nationalism in India, The Rowlatt Act, Dear students, you studied about the earliest three movements that were organized by Mahatma, Gandhi in the worksheet number 71. These movements were quite successful and the British, government had to accept the demands. Emboldened with this success, Gandhiji in 1919 decided to, launch a nationwide satyagraha against the proposed Rowlatt Act (1919), Rowlatt Act was passed hurriedly through the Imperial Legislative Council despite the united, opposition of the Indian members. It gave the government enormous powers to repress political, activities, and allowed detention of the political prisoners without trial for two years. Mahatma, Gandhi wanted non-violent civil disobedience against such unjust laws., Important Events:, A hartal was called on 6 April 1919. Rallies were organized in various cities, workers went on strike, in railway workshops, and shops closed down., Alarmed by the popular upsurge, the British administration decided to clamp down on nationalists., Local leaders were picked up from Amritsar, and Mahatma Gandhi was barred from entering Delhi., On 10 April 1919, the police in Amritsar fired upon a peaceful procession, provoking widespread, attacks on banks, post offices and railway stations. Martial law was imposed., On 13 April 1919, the infamous Jallianwalla Bagh incident took place. On that day a large crowd, gathered in the enclosed ground of Jallianwalla Bagh. Some came to protest against the, government’s new repressive measures. Others had come to attend the annual Baisakhi fair. Being, from outside the city, many villagers were unaware of the martial law that had been imposed., General Dyer entered the area, blocked the exit points, and opened fire on the crowd, killing, hundreds., Answer the following questions:, 1. What was the Rowlatt Act? Why were people opposed to this Act?, 2. Mention the important incidents related to the protest of the Rowlatt Act., , COVID appropriate behaviour (CAB) message:, Keep maintaining physical distance of 6 feet or 2 yards.

Page 6 :
Directorate of Education GNCT of Delhi, Subject: English, Worksheet: 73, Class: X, Name of Student………………………, , Date: 25/01/2022, Name of Class Teacher…...…………….., , Look at the given pie chart. It shows the annual spendings of a country’s budget. Analyze for important, information and write an ‘Analytical Paragraph’., , COVID appropriate behaviour (CAB) message:, Wash your hands with soap and water regularly.

Page 8 :
Directorate of Education, GNCT of Delhi, Subject: Mathematics, Worksheet: 75, Date: 25/01/2022, Class: X, Name of Student……………………… Name of Class Teacher…...…………….., , MEAN: DIRECT METHOD, Definition: It is the average value of any collection of numbers (observations). It is denoted as ̅ ., Mathematically, mean is calculated as, , ̅ =, , "#$ % &'' ()* %+,*-.&( %/,, 0%(&' /#$+*- % %+,*-.&( %/,, , Grouped data : The data represented in the form of class-intervals with frequency distribution is called, GROUPED DATA. A grouped data can be presented as :, Class-interval, , Lower, Class-limit, , 0-5, 5-10, 10-15, ⑮-⑳, 20-25, 25-30 Upper, 30-35 class-limit, 35-40, Total, , Frequency, (fi), 7, 4, 9, 5, 4, 6, 3, 2, 40, , How can we find mean, , for grouped data?, Mean for grouped data can be found by many, methods. One of the method is Direct Method., Today, we will discuss direct method to find the, mean of grouped data., , Example 1 : Find mean for the given grouped data., Solution :, Class- Frequency Class-mark, fi i, Steps for finding mean by DIRECT METHOD :, interval, (fi), ( i), 1. Write the table., 0-5, 7, 2.5, 17.5, 2. Find class-mark of each class-interval under, 5-10, 4, 7.5, 28, the column i., 10-15, 9, 12.5, 112.5, 3. Find the product of class-mark and frequency, 15-20, 5, 17.5, 87.5, under the column fi i., 20-25, 4, 22.5, 90, 4 Find the sum of the column fi i as Σfi i., 25-30, 6, 27.5, 165, 30-35, 3, 32.5, 97.5, 5. Find mean as, =, 35-40, 2, 37.5, 75, Σfi = 40, Σfi i=667, , Try it yourself, , Here mean is ̅ =, , =, , = 16.675 ≌ 16.7, , Q1. The following table shows literacy rate (in %) of 35 cities. Find the mean literacy rate., Literacy rate(in%), , 45-55, , 55-65, , 65-75, , 75-85, , 85-95, , Number of cities, , 3, , 10, , 11, , 8, , 3, , Q 2. The following table shows the overtime (in hours) done by 180 employees of a company. Find the, mean overtime of the employees., Overtime (in hours), , 10-20, , 20-30, , 30-40, , 40-50, , 50-60, , No. of Employees, , 47, , 32, , 21, , 45, , 35, , COVID appropriate behaviour (CAB) message:, Keep maintaining physical distance of 6 feet or 2 yards.

Page 9 :
Directorate of Education ,GNCT of Delhi, Subject: Science, Worksheet: 69, Date: 25-01-2022, 17/01/2022, 75, Class: X, Name of Student………………………, Name of Class Teacher…...…………….., OUR ENVIRONMENT, ECOSYSTEM:, An ecosystem consists of biotic components On the basis of nutrition, comprising living organisms and abiotic Biotic components are divided into :, components comprising physical factors, Producers:, Consumers:, Decomposers, like temperature, rainfall, wind, soil and The organisms, The organisms, The organisms, can produce their, minerals., which are, which, TYPES OF ECOSYSTEM:, Natural ecosystem:- Man- made, The ecosystem, which, ecosystem:, exist in nature on its, own like lake, pond,, forest, grassland,ocean, etc., , are called artificial, ecosystem which are, created and, maintained by humans, like crop field,, aquarium and garden., , Components of ecosystem:, Biotic Components:, All, the, living, components such as, plants,, animals,, bacteria, fungi etc., form, the, biotic, components., , Abiotic, Components:, All the non-living, components such as, air, water, land, light,, temperature etc. form, the, abiotic, components., , own food using, abiotic, components, (photosynthesis),, hence called, producers or, autotrophs., e.g. All green, plants and bluegreen algae, , dependent on, producers for, their food are, called, consumers or, heterotrophs., Eg. All animals, including, human., , decompose the, dead plants and, animals .These, help in the, replenishment of, natural resources., e.g. bacteria,, fungi., , Consumers are further divided into :, , 1)Herbivores: the animals which eat, green plants only as their food.They, are also called primary consumers., Eg.cow, deer, rabbit etc., 2)Carnivores: These animals are, flesh eaters and are called secondary, consumers e.g., tiger, crocodile, 3)Omnivores: The animals which, eats both plants and animals e.g.,, human., 4)Parasites: The animals who live on, the body of host and take food from, it without killing e.g., lice, cascuta., QUESTIONS:, 1)Explain the terms Producers, Consumers and, Decomposers. Give two examples of each., 2)Why plants are called producers?, 3)what is the difference between natural and, artificial ecosystems?, 4)What are parasites?, 5)What is the role of decomposers?, , COVID appropriate behaviour (CAB) message:, Wash your hands with soap and water regularly.

Page 10 :
Directorate of Education GNCT of Delhi, Subject: Social Science, Worksheet: 73, Date: 25/01/2022, Class: X Name of Student……………. Name of Class Teacher…...……., Chapter- 3: Nationalism in India, While the Rowlatt satyagraha had been a widespread movement, it was still limited mostly to cities and, towns. Mahatma Gandhi now felt the need to launch a more broad-based movement in India. For this, he, wanted to bring Hindus and Muslims closer together. One way of doing this, he felt, was to take up the, Khilafat issue., , Khilafat Movement, The First World War had ended and Ottoman Turkey was also on defeated side. And there were rumours that, a harsh peace treaty was going to be imposed on the Ottoman emperor- the spiritual head of the Islamic, world (the Khalifa). To defend the Khalifa’s temporal powers, a Khilafat Committee was formed in Mumbai, (then Bombay) in March 1919. A young generation of Muslim leaders like the brothers Muhammad Ali and, Shaukat Ali began discussing with Mahatma Gandhi about the possibility to bring Muslims under the umbrella, of a unified national movement. At the Calcutta (now Kolkata) session of the Congress in September 1920, he, convinced other leaders of the need to start a non-cooperation movement in support of Khilafat as well as for, swaraj., , Non-Cooperation Movement, Mahatma Gandhi in his book Hind Swaraj (1909) had declared that British rule was established in India with, the cooperation of Indians and had survived only because of this cooperation. If Indians refused to cooperate,, British rule in India would collapse within a year, and swaraj would come., In order to make the non-cooperation a movement, Gandhiji proposed that the movement should unfold in, stages. It should begin with the surrender of titles that the government awarded, and a boycott of civil, services, army, police, courts and legislative councils, schools and foreign goods. Then, in case the government, used repression, a full civil disobedience campaign would be launched., The Non-Cooperation programme was adopted at Nagpur session of Congress in December, 1920. The NonCooperation-Khilafat Movement began in January 1921., Answer the following questions:, 1. Write a short note on the Khilafat Movement., 2. Mention the important programmes of the Non-Cooperation Movement., , COVID appropriate behaviour (CAB) message:, Wash your hands with soap and water regularly.

Page 11 :
Directorate of Education, GNCT of Delhi, Subject: Mathematics, Worksheet: 76, Date: 27/01/2022, Class: X, Name of Student………………. Name of Class Teacher…...…………….., Mean: Direct Method, Steps for finding mean by DIRECT METHOD :, 1. Write the table., 2. Find class-mark of each class-interval under the Column 𝔁i., 3. Find the product of class-mark and frequency under the column fi𝔁i., 4 Find the sum of the column fi𝒙𝒊 as Σfi𝒙i., 5. Find mean as, , 𝜮𝒇𝒊𝔁𝒊, 𝑋̅ =, 𝜮𝒇𝒊, , Example 1: The mean of the following distribution is 50. Find the value of q., , Solution1:, , Class, 0-20, Frequency 17, , 20-40, 32, , Class, 0-20, 20-40, 40-60, 60-80, , Frequency, 17, 32, 24, q, , 80-100, , 40-60, q, , 60-80, 24, , 80-100, 19, , 𝔁i, 10, 30, 50, 70, , 19, Σfi = 92+q, , Mean =50 (given), Σfi = 92+q, Σfi𝔁I = 4040+70q, 𝛴𝑓𝑖𝓍𝑖, 𝑋̅ =, 𝛴𝑓𝑖, 4040+70𝑞, ⇒ 50 = 92+𝑞, ⇒ 4600 + 50q = 4040 + 70q, , 𝑓𝑖𝓍𝑖, 170, 960, 1200, 70q, , 90, , 1710, Σfi𝔁I =4040+70q, , ⇒ 20q = 560, ⇒ q = 28, , Example 2: The mean of the following frequency distribution is 22, find the missing value ‘f’., Solution2:, , Class, 0-10, Frequency 12, Class, 0-10, 10-20, 20-30, 30-40, 40-50, , 10-20, 16, , 20-30, 6, , 30-40, f, , 𝔁i, 5, 15, 25, 35, 45, , Frequency, 12, 16, 6, f, 9, , Mean =22 (given), Σfi = 43+f, Σfi𝔁I = 855+35f, 𝛴𝑓𝑖𝓍𝑖, 𝑋̅ = 𝛴𝑓𝑖, ⇒ 22 = 855+35f, 43+f, ⇒ 946 + 22f = 855+35f, , 40-50, 9, 𝑓𝑖𝓍𝑖, 60, 240, 150, 35f, 405, , Σfi = 43+f, , ⇒, , 35f-22f = 946 - 855, , ⇒, , 13f, , = 91, , 91, , ⇒ f= 13=7, , Σfi𝔁I =855+35f, , ⇒, , Try yourself, , f= 7, , Q1. The number of plants in 50 houses in a locality are given below. Find the mean number of plants per house., Number of plants, Number of houses, , 0-10, 7, , 10-20, 8, , 20-30, 15, , 30-40, 9, , 40-50, 11, , Q2. The mean of the following data is 25.2. Find the missing value k., Class, Frequency, , 0-10, 8, , 10-20, 12, , 20-30, 10, , COVID appropriate behaviour (CAB) message:, Wash your hands with soap and water regularly., , 30-40, 11, , 40-50, K

Page 13 :
Directorate of Education GNCT of Delhi, Subject: English, Worksheet: 74, Date: 27/01/2022, Class: X Name of Student………………………, Name of Class Teacher…...……………., FOOTPRINTS WITHOUT FEET- Chapter 9 ‘BHOLI’, Q1. On the basis of your understanding of the lesson, answer the questions given below. (30-40 words), (a) How was Bholi’s first day at school? Could she make any friends? Why/ Why not?, ________________________________________________________________________________________, ________________________________________________________________________________________, ________________________________________________________________________________________, (b) Why did the teacher treat Bholi with kindness?, ________________________________________________________________________________________, ________________________________________________________________________________________, ________________________________________________________________________________________, (c) How did Bholi’s mother convince her father that Bishamber was the right match for her?, ________________________________________________________________________________________, ________________________________________________________________________________________, ________________________________________________________________________________________, (d) Did Bholi feel happy when she heard about the groom? Why did she agree to marry him?, ________________________________________________________________________________________, ________________________________________________________________________________________, ________________________________________________________________________________________, (e) What did Bholi say to pacify her parents after refusing to marry Bishamber?, ________________________________________________________________________________________, ________________________________________________________________________________________, ________________________________________________________________________________________, (f) Sulekha did not stammer while talking back to her aunt. What brought about this transformation?, ________________________________________________________________________________________, ________________________________________________________________________________________, ________________________________________________________________________________________, Q2. Answer the following question in 100-120 words:, Compare Bholi’s teacher with your favourite teacher mentioning three similarities and, one difference. How has this teacher made a difference in your life? Explain with an, example., ___________________________________________________________________________________________, ___________________________________________________________________________________________, ___________________________________________________________________________________________, ___________________________________________________________________________________________, ___________________________________________________________________________________________, ___________________________________________________________________________________________, ___________________________________________________________________________________________, ___________________________________________________________________________________________, ___________________________________________________________________________________________, Q3. Identify the error in each line and write its correction in the space given below:, Error, You may send your daughters to school., __________, , Correction, ____________, , That night when Ramlal consults his wife, she cried, “Are you crazy?, , __________, , ____________, , If girls go to school, who has marry them?”, , __________, , ____________, , COVID appropriate behaviour (CAB) message:, To stay safe in the fight against COVID-19, wear a mask

Page 14 :
Directorate of Education GNCT of Delhi, Subject: Science, Worksheet: 76, Date: 27/01/2022, Class: X, Name of Student……………………… Name of Class Teacher…...…………….., OUR ENVIRONMENT, FOOD CHAIN, , TROPHIC LEVELS, , v Food chain is a series of organisms in, which one organism eats another as, food., v The flow of nutrition and energy from, one organism to another through food is, called a food chain., v Food chain starts with producer., v Flow of energy in a food chain is, unidirectional., , e.g., à Tiger, 1) Grass à Deer, à Grasshopper à Frog à, 2) Plant, Eagle, 3) Water plants à Crab à Fish à Crane, , The various steps in a food chain at which the, transfer of food or energy takes place are, called trophic levels., Plant, , à Grasshopper à Frog à Eagle, , (producer) (herbivore) (carnivore) (top-carnivore), LEVEL-I, L, , LEVEL-II, , LEVEL-III, , LEVEL -IV, , The transfer is never 100%. Thus each, successive trophic level receives lesser energy, than previous resulting in a pyramid shape., , FOOD- CHAIN, , Ideal Pyramid of Energy, , TEN PERCENT LAW(10%):, According to 10% law,, “Only ten percent of the energy entering a particular, trophic level of organisms is available for transfer, to the next higher trophic level.”, , FOOD-WEB:, v Several, interconnected, food chains form, a food web., v Single food, chain doesn’t, occur naturally, in an ecosystem., , Let us Practice:, 1.If 20000J energy is at producer level what, amount of energy will be transferred to, secondary consumer level., 2.Draw food chain of pond and forest both., 3.Define a trophic level. Draw any foodchain with four trophic levels., FOOD- WEB, , COVID appropriate behaviour (CAB) message:, Wash your hands with soap and water regularly.

Page 15 :
Directorate of Education GNCT of Delhi, Subject: Social Science, Worksheet: 74, Date: 27/01/2022, Class: X Name of Student……………. Name of Class Teacher…...……, Chapter- 3: Nationalism in India, With the start of the Non-Cooperation Movement in January 1921, various social groups, participated in it with its own specific aspirations. All of them responded to the call of Swaraj,, but the term meant different things to different people. In this worksheet, we will study the, participation of the people the towns/cities., , Non-Cooperation Movement in the Towns/Cities, Participation of various groups-The movement started with the middle- class participation in, the cities. Thousands of students left government controlled schools and colleges, headmasters, and teachers resigned, and lawyers gave up their legal practices. The council elections were, boycotted in most provinces., Impact on foreign goods- Foreign goods were boycotted, liquor shops picketed, and foreign, cloth burnt in huge bonfires. The import of foreign cloth halved between 1921 and 1922, its, value dropping from Rs. 102 crore to Rs. 57 crore. In many places merchants and traders, refused to trade in foreign goods and people began discarding imported clothes and wearing, only Indian clothes. Consequently, production of Indian textile and mills and handlooms went, up., Slow down of the Movement- The movement in the cities gradually slowed down for a variety, of reasons:, (i), (ii), , Khadi cloth was often more expensive than mass-produced mill cloth and poor, people could not afford to buy it., Boycott of the British institutions posed a problem as well. Alternative Indian, institutions could not be set up rapidly. So students and teachers started going back, to government schools and lawyers joined back work in government courts., , Answer the following questions:, 1. How did the various groups participate in the Non-Cooperation Movement in the, towns/cities? Why did the movement gradually slow down?, 2. If you were a student during the Non-Cooperation Movement, how would you have, participated in it?, COVID appropriate behaviour (CAB) message:, To stay safe in the fight against COVID-19, wear a mask

Page 16 :
Directorate of Education GNCT of Delhi, Subject: ENGLISH, Worksheet:75, Date: 28/01/2022, Class: X, Name of Student……………………… Name of Class Teacher…...…………….., FOOTPRINTS WITHOUT FEET- Chapter 9 ‘BHOLI’, Q1. Sulekha has become the Principal of Neerali Village school. The village panchayat has finally decreed, that the empty piece of land beside the school will be used as its playground. You are Ms. Kamini Gupta,, the Physical Education Teacher (PET) in the school. The Principal has asked you to place an order for, necessary sports equipment such as, footballs, Basketballs, Cricket Sets, Badminton Racquets and Hockey, Sticks, etc. Write a letter to M/s Delhi Sports, Daryaganj placing an order for the same in 125 – 150 words., Neerali Village School, Veer Pradesh, 28 January 2022, The Sales Manager, __________________________, Daryaganj, Delhi, Subject: __________________________________________________________, Sir/ Madam, This is with reference to your quotation ______________________________________________________, _______________________________________________________________________________________, _______________________________________________________________________________________, _______________________________________________________________________________________, _______________________________________________________________________________________, The list of particulars are as follows:, S. NO, , NAME OF SPORTS ITEM, , QUANTITY, , The payment will be made by cheque on receipt of the goods. Kindly ensure that all the items in the order, are in good condition and reach us ______________________________________, Thank you, Yours truly, __________________________, __________________________, COVID appropriate behaviour (CAB) message:, Keep maintaining physical distance of 6 feet or 2 yards.

Page 18 :
Directorate of Education GNCT of Delhi, Subject: Mathematics, Worksheet: 77, Date: 28/01/2022, Class: X, Name of Student……………………… Name of Class Teacher…...…………….., Mean: Assumed Mean Method, In statistics, the assumed mean method is used for, calculating mean or arithmetic mean of a grouped data. If, the given data is large, then this method is recommended, rather than a direct method for calculating mean. This, method helps in reducing the calculations ., Let x1, x2, x3,…,xn are mid-points or class marks of n, class intervals and, f1, f2, f3, …, fn are the respective frequencies., The formula of the assumed mean method is:, , STEPS To find mean using assumed mean method, 1. Form a table with 5 columns, 2. Fill first column with class intervals values given in, the question., 3. Fill the 2nd column with the frequency ‘fi’, corresponding to the class intervals provided in the, question, 4. Fill the 3rd column with class marks (class marks, are the middle values of the class intervals) denoted, by xi ., 5. Central value will be picked up from the column of, Here,, class marks denoted as ‘a’., a = assumed mean, 6. Now we will find ‘di ’ in 4th column where, fi = frequency of ith class, di = xi –a i.e. difference between class mark and, di = xi – a = deviation of ith class, assumed mean., Σfi = n = Total number of observations, 7. Last column filled by product of f i and d i i.e., xi = class mark = (upper class limit + lower class limit), 2, f i× d i.., 8. Now apply the formula to find the mean., Example 1: The following table gives information about the, marks obtained by 110 students in an examination., Class, 0-10 10-20 20-30 30-40 40-50, Frequency 12, 28, 32, 25, 13, TRY YOURSELF, Find the mean marks of the students using the assumed, mean method., Solution:, Class, Frequency, Class, di = xi – fidi, 1. The table below shows the daily expenditure on, (CI), (fi), mark (xi) a, food of 25 households in a locality. Find the mean, 0-10, 12, 5, 5 – 25 = -240, daily expenditure on food by assumed mean method., – 20, 10-20, 28, 15, 15 – 25, -280, Daily, 100- 150- 200- 250- 300= – 10, expenditure, 20-30, 32, 25 = a, 25-25 =, 0, 150 200, 250, 300, 350, (Rs), 0, 30-40, 25, 35, 35-25 =, 250, No. of, 10, 4, 5, 12, 2, 2, households, 40-50, 13, 45, 45-25 =, 260, 20, Total, Σfi =110, Σfidi = 10, 2. Find the mean of the following data by assumed, Assumed mean = a = 25, Mean of the data:, = 25 + (-10/ 110), = 25 -( 1/11), = (275-1)/11, = 274/11 =24.9, Hence, the mean marks of the students are 24.9., , mean method., CI 50–, 150, , 150 –, 250, , 250 –, 350, , 350– 450 –, 450 550, , 550–, 650, , f, , 5, , 16, , 12, , 3, , 7, , COVID appropriate behaviour (CAB) message:, To stay safe in the fight against COVID-19, wear a mask, , 2

Page 19 :
Directorate of Education ,GNCT of Delhi, Subject: Science, Worksheet: 77, Date:28-01-2022, Class: X Name of Student……………………… Name of Class Teacher…...…………….., , OUR ENVIRONMENT, We have discussed about Food Chains, Trophic BIOLOGICAL MAGNIFICATION:, Levels And Ten Percent Law In our previous, worksheets., v The increase in the concentration of, We should remember the following points about, harmful chemical substances like, the transfer of energy in the ecosystem:, pesticides in the body of living, • Energy is not created in the ecosystem., organisms at each trophic level of a food, Energy is only converted from one form to, chain is called biological magnification., another., v It expands over different trophic levels., • There is a continuous transfer of energy from, v Organisms at higher trophic levels have, one trophic level of organisms to the next in a, higher concentration of such chemicals., food chain., v Eg. In this case, man will have the, • At each trophic level of organisms, some of, highest amount of pesticides., the energy is utilized by the organisms for, their activities like respiration or for growth., • A part of the energy at each trophic level is, PesticidesàSoilàPlantsàHerbivoreàMan, utilized for the functioning of decomposers., • There is a loss of energy at various trophic, v Pesticides are non-biodegradable, levels which goes into the environment and, chemicals, so they get accumulated at each, remains unutilized., trophic level. Since humans occupy the top, Thus, when we move from one trophic level to, level in any food chain, so the maximum, the next, the amount of energy available, amount of harmful chemicals get, gradually decreases. This is because at each, accumulated in our bodies. This damages, level, energy is lost as heat energy which goes, our health gradually., into the environment., , The flow of energy in the ecosystem is unidirectional., The energy enters the plants from the sun through photosynthesis. This energy is passed on from, one organism to another in a food chain. Energy given out by the organisms as heat is lost to the, environment, it does not return for the plants to be used again. Thus the flow of energy is, unidirectional or in one direction., , Let us Practice:, 1. Describe with the help of a flow diagram, how energy from the sun flows through various, trophic levels., 2. Explain why the flow of energy in the ecosystem is said to be unidirectional?, 3. What is meant by biological magnification?, 4. ”If we excessively use pesticides to protect the crops from diseases, then it may cause long, term damage to mankind”. Justify the statement., COVID appropriate behaviour (CAB) message:, Wash your hands with soap and water regularly.

Page 20 :
Directorate of Education GNCT of Delhi, Subject: Social Science, Worksheet: 75, Date: 28/01/2022, Class: X Name of Student…………………… Name of Class Teacher….………….., Chapter- 3: Nationalism in India, Rebellion in the countryside, In Awadh- Here the peasants were led by Baba Ramchandra. The movement here was against talukdars and, landlords who demanded exorbitantly high rents and a variety of other cesses from peasants. Peasants had to, do begar and work at landlords’ farms without any payment. The peasant movement demanded reduction of, revenue, abolition of begar and social boycott of oppressive landlords. By October 1920, the Oudh Kisan Sabha, was set up. Within a month, over 300 branches had been set up in the villages around the region. So when the, Non-Cooperation Movement began the following year, the effort of the Congress was to integrate the Awadh, peasant struggle into the wider struggle. The peasant movement, however, developed in forms that the, Congress leadership was unhappy with. As the movement spread in 1921, the houses of talukdars and, merchants were attacked, bazaars were looted, and grain hoards were taken over. The name of Mahatma, Gandhi was being invoked to sanction all action and aspirations., In Gudem Hills of Andhra Pradesh- Tribal peasants in this area interpreted the message of Mahatma Gandhi, and the idea of swaraj in yet another way. In the early 1920s, a militant guerrilla movement spread. The, people were enraged by the forest rules made by the colonial government. They were prevented from, entering the forests to graze their cattle, or to collect fuelwood and fruits. Their leader was Alluri Sitaram Raju., He claimed that he had a variety of special powers: he could make correct astrological predictions and heal, people, and he could survive even bullet shots. Raju talked of the greatness of Mahatma Gandhi, said he was, inspired by the Non-Cooperation Movement, and persuaded people to wear khadi and give up drinking. But at, the same time he asserted that India could be liberated only by the use of force, not non-violence. The Gudem, rebels attacked police stations, attempted to kill British officials and carried on guerrilla warfare for achieving, swaraj. Raju was captured and executed in 1924., Answer the following questions:, 1. How did the peasants of Awadh and Gudem Hills of Andhra Pradesh participate in the NonCooperation Movement?, 2. How was the participation of the peasants in the Non-Cooperation Movement different from, participation of people in cities in it?, , COVID appropriate behaviour (CAB) message:, Keep maintaining physical distance of 6 feet or 2 yards.