[3 marks Question Answer]

Question 13 Marks

What is the importance of respiration?

Answer

Respiration is important because it produces energy that is necessary for the functioning of the body. It provides oxygen to the cells and expels toxic carbon dioxide. When oxygen reaches the cells, this oxygen breakdown glucose which is present in digested food, and releases energy.

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Question 23 Marks

Write in short about the process of respiration.

Answer

Respiration is the process of releasing energy by breaking down food (glucose) needed for various body activities. Respiration is a biological process in which an organism’s cells obtain energy by mixing oxygen and glucose and emitting carbon dioxide, water, and ATP (the currency of energy in cells).

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Question 33 Marks

How does respiration occur in plants? Write a note on it.

Answer

The roots of a plant take oxygen required for respiration from the air present in between the soil particles by the process of diffusion. This oxygen is used in respiration in cells of the leaf. The carbon dioxide produced during diffuses out from the leaf into the air through same stomata.

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Question 43 Marks

Differentiate between :
Aerobic and Anaerobic Respiration

Answer

Aerobic Respiration	Anaerobic Respiration
1. It takes place in the presence of oxygen.	It takes place in the absence of oxygen.
2. Food molecules (sugars) are completely broken down into carbon dioxide and water, releasing energy.	Food molecules (sugars) are partially broken down into ethyl alcohol, carbon dioxide and energy.
3. Energy released is more (38 ATP molecules).	Energy released is much less (2 ATP molecules).

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BIOLOGY [3 marks Question Answer]

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