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Topic: C3 and C4 pathways, photorespiration· Plant Physiology

A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rates of photosynthesis at high temperatures and has improved efficiency of nitrogen utilisation. In which of the following physiological groups woul…

A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rates of photosynthesis at high temperatures and has improved efficiency of nitrogen utilisation. In which of the following physiological groups would you assign this plant ?

1. C\(_3\)

2. C\(_4\)

3. CAM

4. Nitrogen fixer

1 answer

Best answer

Answer: 2. C\(_4\)

The listed features are the hallmarks of C4 plants.

C4 plants have Kranz anatomy and PEP carboxylase, which fixes CO2 in mesophyll cells and concentrates it around RuBisCO in bundle-sheath cells. This suppresses oxygenase activity, so photorespiration is absent, water use is efficient, and photosynthesis stays high at high temperature. C3 plants lose carbon by photorespiration; CAM plants have low growth rates; a nitrogen fixer is not a photosynthetic type.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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