Name the end products of anaerobic respiration in yeast.

2

(a)

In some animals, exchange of gases takes place through its thin and moist skin. Name one such animal.

2

(a)

In the experiment, where we exhale into lime water containing glass. What changes were observed by you?

2

(a)

Insects have a special organ present to carry out respiration. What is that organ called?

2

(a)

All organisms breathe in O₂ and CO₂, Should be less O₂ and excess of CO₂ in our environment.

2

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The process of fermentation is based on which principle?

2

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Does this explain why we feel hungry after a physical activity?

2

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When you feel drowsy, does your breathing rate slowdown?

2

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Can you say in which activity the rate of breathing will be the slowest and in which it will be the fasted?

2

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Do we exhale only carbon dioxide or a mixture of gases along with it?

2

(a)

What is the importance of breathing.

2

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Why do you get cramps after heavy exercises?

2

(a)

Why do we get muscle cramps after heavy exercise

2

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Whenever we feel drowsy or sleepy, we start yawning. Does yawning help us in anyway?

2

(a)

Why does a fish did when kept outside water even through there is oxygen in the surrounding air?

2

(a)