Photorespiration is favoured by
- high $O_2$ and low $CO_2$
- low light and high $O_2$
- low temperature and high $O_2$
- low $O_2$ and high $CO_2$
The Correct Option is A
Solution and Explanation
Top Questions on Photorespiration
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Questions Asked in NEET exam
A sphere of radius R is cut from a larger solid sphere of radius 2R as shown in the figure. The ratio of the moment of inertia of the smaller sphere to that of the rest part of the sphere about the Y-axis is :
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AB is a part of an electrical circuit (see figure). The potential difference \(V_A - V_B\), at the instant when current \(i = 2\) A and is increasing at a rate of 1 amp/second is:
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Concepts Used:
Photorespiration
Photorespiration is a wasteful process in plants in which plants intake oxygen, and sunlight and release carbon dioxide and no glucose is formed. Photorespiration generally takes place when the concentration of oxygen in the leaves is very high and that of carbon dioxide is very low.
In Calvin cycle carbon dioxide fixation does not take place . Hence, instead of carbon dioxide oxygen reacts with RuBP.
Photorespiration in C3 and C4 Plants:
- C4 plants do not undergo photorespiration due to their special mechanism to increase the CO2 level for enzyme binding.
- In Hatch and Slack Pathway, C4 acid and oxaloacetic acid breaks down to release CO2.
- This ensures a high concentration of intercellular CO2.
- Thus, in C4 plants, RuBisCO is more active as a carboxylase enzyme rather than as an oxygenase.
- This is why C4 plants have better productivity.