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Questions and Answers, , , , Question 1., , Why does an athlete breathe faster and, deeper than usual after finishing the race?, Answer:, , When the athlete runs in the race, his body, needs more energy. In order to get extra, energy, the athlete breathes faster and, also takes, deep breaths. Because more, oxygen is supplied to our cells. It speeds, up the breakdown of food and more, , energy is released.

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Question 2., , List the similarities and differences, between aerobic and anaerobic, respiration., , Answer:, , Similarities:, , e In both, food (glucose) is broken, down., e In both processes, energy is released., , ¢ Both take place in the cells., , Differences:, , Aerobic Anaerobic, respiration respiration, (a) It takes, , (a) It takes place in, , place in the, the absence of, , presence of, oxygen., oxygen.

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Differences:, , Aerobic, , respiration, , (a) It takes, place in the, presence of, , oxygen., , (b)More energy, is released in, , this process, , (c) Glucose is, broken down, , completely., , (d) Carbon, dioxide, water, vapor, and, energy are, , £n~--~--1, , Ge Ge Ge Ge Luis, , Anaerobic, , respiration, , (a) It takes place in, the absence of, , oxygen., , (b) Less energy is, released in this, , process., , (c) Glucose is not, broken completely, , (d) Alcohol, lactic, acid carbon, dioxide, and energy, , are formed., , ne ——

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Question 3., , Why do we often sneeze when we inhale a, lot of dust-laden air., , Answer:, , The air around us contains various types, of unwanted particles such as smoke,, dust, pollens along with different gases., When we inhale, dust particles get trapped, in the hair present in our nasal cavity. This, causes irritation in the lining of the cavity., This results in sneezing. Sneezing expels, the dust particles and other foreign, particles from the inhaled air and a dust, free, clean air enters our body.

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Question 5., , Tick the correct answer :, , a. In cockroaches, air enters the body, through, , i. lungs, , ii. gills, , iii. spiracles, , iv. skin, , Answer:, , ili. spiracles, , b. During heavy exercise, we get cramps in, the legs due to the accumulation of, , i. carbon dioxide, , ii. lactic acid, , iii. alcohol, , iv. water, , Answer:, , it lactic acid