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Define excretion

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Differentiate between osmoregulation and thermoregulation.

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What do you mean by homeostatsis? Why is it necessary?

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The breathing becomes rapid and deep after exercise. Why?

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What is the stimulus of breathing?

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Why there is more risk of heart attack among smokers?

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small quantity of nicotine beneficial?

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Is small quantity of nicotine beneficial?

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Write three measures taken by the government to discourage.

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What are the effects of tar on lungs?

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What are the main effects of smoking?

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What do you observe about the position of the heart in normal and smoker’s chest cavity?

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Compare non-smokers’ lungs with those of smokers and note your observations.

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Observe the presence of tar by rubbing white tissue paper on the inner surface of the funnel.

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An animal is placed in an apparatus where it re-breathes the same air continuously. Its breathing rate increases. Why?

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The amount of carbon dioxide is higher in exhaled air as compared to atmospheric air. Why?

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Which of the flask is acting as a control? Justify.

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Which compound is formed when limewater combines with carbon dioxide?

asked Oct 16, 2017 in English by sonia (36.5k points)

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The result you have noted is only because of the carbon dioxide

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In the lungs, the oxygen passes from the alveoli to the blood. What features make this process rapid?

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