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The diagram below shows the effect of varying light intensity on the exchange of carbon IV oxide between the leaves of a green plant and...

      

The diagram below shows the effect of varying light intensity on the exchange of carbon IV oxide between the leaves of a green plant and the atmosphere.

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a) What is the name given to the point marked x?

b)
i) With reference to carbon IV oxide exchange state what happens at point x.
ii) Explain how the effect observed at point x occurs.

c) Explain why there is a net uptake of carbon IV oxide at light intensity above x.

d) What would happen to the plant if light intensity falling on it were maintained at x throughout?

e) What can you say about the exchange of oxygen between the plant and the surrounding air at intensities below x?

  

Answers


Martin
(a) Compensation point

(b) (i) There is no net uptake or release of Carbon (VI) oxide by the plant;

(ii) The rate of respiration and photosynthesis in the plants are equal; therefore all the Carbon (VI) Oxide released during respiration is used in photosynthesis;

(c) At light intensity beyond/above X, the rate of photosynthesis is higher than the rate of respiration; and this requires a net uptake of Carbon (IV) Oxide (to sustain the increasing rate of photosynthesis);

(d) Growth would cease because all the products of photosynthesis would be utilized in respiration;

(e) The plant will take up oxygen from the surrounding air since the rate of respiration is higher than the rate of photosynthesis
marto answered the question on October 4, 2019 at 08:14


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