Question 1 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d08af59b460d7261f312.JPG' />
From the above figure complete the following cycle , By filling the blank (a)
Question 2 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d089f59b460d7261f310.JPG' />
Observe the above image and find out how does the disease spread from one plant to another.
Question 4 :
Pathogenic micro-organisms present in host cells are killed by medicines called
Question 5 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d087f59b460d7261f30e.JPG' />
Observe the image and write the name of the disease
Question 6 :
In the soil, which nutrient is enriched by blue-green algae or cyanobacteria?
Question 7 :
Suggest a suitable word for the following statement. Agent which spreads pathogens from one place to another.
Question 8 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d088f59b460d7261f30f.JPG' />
Observe the above image and name the causative agent of this disease.
Question 10 :
The disease caused by a protozoan and spread by an insect is
Question 11 :
Unscramble the jumbled words underlined in the following statement: $\underline {curbossulite}$ is an air-borne disease caused by a bacterium.
Question 12 :
Suggest a suitable word for the following statement. Nitrogen-fixing microorganism present in the root nodules of legumes.
Question 13 :
Unscramble the jumbled words underlined in the following statement.Yeasts are used in the wine industry because of their property of $\underline {meronettinaf}$ .
Question 17 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d08ef59b460d7261f317.JPG' />
From the above image find out which gas is released in A?
Question 19 :
Suggest a suitable word for the following statement. Chemicals added to food to prevent growth of microorganisms.
Question 21 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d086f59b460d7261f30c.JPG' />
From the above image name the food item on which the organism lives.
Question 22 :
Unscramble the jumbled words underlined in the following statement: $\underline {Xanrhat}$ is a dangerous bacterial disease.
Question 23 :
Suggest a suitable word for each of the following statement.Chemicals which kill or stop the growth of pathogens
Question 24 :
Paheli dug two pits, A and B, in her garden. In pit A, she put a polythene bag packed with some agricultural waste. In pit B, she dumped the same kind of waste but without packing it in a polythene bag. She, then covered both the pits with soil. What did she observe after a month?
Question 25 :
Unscramble the jumbled words underlined in the following statement: Cells of our body produce $\underline {santiidobe}$ to fight pathogens.
Question 30 :
A disease caused by one of the smallest known virus is
Question 35 :
Parasitic alga is - Tea and Coffee leaves are infected by
Question 36 :
The nitrogen molecules present in air can be converted into nitrates and nitrites by:
Question 37 :
Extract of Tobacco with Mosaic disease was called contagium vivum fluidum by
Question 40 :
Which famous biologist showed in the middle of the nineteenth century that beer and butter milk are products of fermentation brought about by years?
Question 41 :
Which among the following is the most reason for storing green coloured apples at low temperatures?<br>
Question 44 : <p class="MsoNormal">The process of heating a liquid to a high temperature and rapidly cooling it to kill bacteria is called:</p>
Question 46 :
Natural fixation of nitrogen takes place through a non-biological process called ___________.<br/>
Question 47 : Match the following.<table class="wysiwyg-table"><tbody><tr><td>(a) Potato spindle</td><td>(i) Virus</td></tr><tr><td>(b) Cr- Jacob disease(CJD)</td><td>(ii) Viroid</td></tr><tr><td>(c) Cholera</td><td>(iii) Prion</td></tr><tr><td>(d) Leaf rolling and curling</td><td>(iv) Bacteria</td></tr></tbody></table>
Question 48 :
In a mixed culture of slow and fast growing bacteria, penicillin will
Question 51 :
Salt is used to preserve food by removing .......... from it.
Question 58 :
Severe famine of West Bengal of 1942-43 was due to destruction of rice crop by a fungus called
Question 61 :
Which microbe is used in preparing beverage cider by fermenting juice in apple?
Question 63 :
The gram negative bacteria detect and respond to chemicals in their surroundings by <br/><br/>
Question 66 :
The process of nitrogen-fixation by bacteria does not take place in the presence of:
Question 69 :
Which substance is produced within an organism to prevent the spread of microorganism?
Question 70 :
Fish can be preserved for longer period of time by adding
Question 71 :
Read the following statements and select the correct option:<br/>STATEMENT I: <i>Nostoc </i>and bacteria are prokaryotes.<br/>STATEMENT II: <i>Penicillium </i>and <i>Spirogyra </i>are fungi.<br/>
Question 73 :
Which of the following pairs of microorganisms and diseases is wrongly matched?
Question 74 :
Which of the following substances are produced by an organism to prevent or reduce the spread of micro organisms?<span class="wysiwyg-font-size-medium">i.  Antiseptics<br/><span class="wysiwyg-font-size-medium">ii. Antibiotics<br/><span class="wysiwyg-font-size-medium">iii. Antibodies
Question 75 :
Organisms that cannot be seen by naked eyes is called as
Question 77 :
Food products are kept in cold storage or refrigerator in order to
Question 81 :
Human Immuno Virus (HIV) contains a protein coat, genetic material and has a horse chestnut shaped 
Question 83 :
Complete the following statement by using the correct option from those given below. <br/>Vinegar is a _____ type of food preservative. 
Question 84 :
A person preparing food like Mary Milton can be a major source of spread of .......... disease.
Question 92 :
............. is the process which is used to make something free from bacteria.
Question 94 :
Penicillin inhibits the growth of bacteria. It's site of action is
Question 97 :  Study the following lists.<br/><table class="wysiwyg-table"><tbody><tr><td>List-I</td><td>List-II</td></tr><tr><td>(A) Syphilis</td><td>(I) Acetobacter </td></tr><tr><td>(B) Pathoacgen of cattle </td><td>(II) Agrobacterium</td></tr><tr><td>(C) Crown Gall of Apples</td><td>(III) Corynebacterium</td></tr><tr><td>(D) Diphtheria</td><td>(IV) Mycobacterium<br/>(V) Treponema</td></tr></tbody></table>
Question 107 :
Mark the correct statement:<br/>a) Common salt has been used to preserve meat and fish for ages.<br/>b) Meat and fish are covered with dry salt to check the growth of bacteria.<br/>c) Salting is also used to preserve amla, raw mangoes, tamarind, etc.
Question 109 :
Among these, the group of infections that are exclusively caused by bacteria are
Question 114 :
The symptoms of food poisoning begin within .......... of eating contaminated food.
Question 117 :
Assertion: Don't store food in an opened tin can, or re-use empty cans to cook or store food.
Reason: When the food is open to the air, the tin from the can might transfer more quickly to the can's contents.
Question 120 :
If a person shows production of interferons in his body, the chances are that he has got an infection of
Question 124 :
The process of nitrogen-fixing is done by bacteria in the presence of oxygen
