Ncert Exercises & Solutions

In what kind of plants do you come across ‘Kranz anatomy’? To which conditions are those plants better adapted? How arethese plants better adapted than the plants, which lack this anatomy?

Kranz anatomy refers to the dimorphism in the chloroplast structure. It is found in C₄ plants. The cells of leaves have two types of chloroplastin them.

Granal Chloroplast It is found in the mesophyll cells of leaves. Chloroplast have well developed grana in them. These chloroplast effectively fix CO₂ even if it is present in lower concentrations. PEP carboxylase is present which fix CO₂ and to form oxaloacetic acid (4 carbon compound).

Agranal Chloroplast Present in bundie sheath cells of the leaves. C₃ cycle occursin these cells with the presence of RuBisCo enzyme.

The C₄ plants are well adaptedto high O₂ concentrations and high temperature.

C₄ plants can absorb CO₂ even when CO₂ concentration in much low thus C₄ plants can perform high rate of photosynthesis even the stomata are closed or there is the shortage of water thus, they can conserve water.

Since, PEP-carboxylase is insensitive to O₂ thus excess O₂ has us inhibitory effect in C₄pathway and there is no photosynthesis in C₄ plant.

Thus, C₄ plants are better adapted to tropical and desert (hot acid habitats) areas than the plants, that lack this anatomy.

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