Q2 of 45 Page 178

Assertion (A) In the day time, CO2 generated during respiration is used up for photosynthesis.

Reason (R) There is no CO2 release during day.

In respiration, O2 is taken in and CO2 is released while in photosynthesis, CO2 is used up and O2 is released. Both photosynthesis and respiration occurs in plant during daytime. But the rate of photosynthesis is much more than rate of respiration. Thus there is no net release of CO2.

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18

After being taught about respiration in living organisms, aditi got confused as to how organisms like earthworm respire. As these organisms lack any special organs for respiration and breathing.

(i) How does earthworm respire when no specialised system is present in them?


(ii) Mention the major function of respiratory pigment.


(iii) What values do you observe in Aditi?

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Which process occurring in human body does not involve energy from respiration?

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The following changes take place in an athlete’s body during a 100m race. Which change occurs first?