Question

Basic feature of Kranz anatomy in C4 plants is
A)Presence of chlorophyll in bundle sheath cells
B)Presence of chloroplast in mesophyll and epidermal cells
C)Presence of typical granal chloroplast in bundle sheath cells and rudimentary chloroplasts in mesophyll cells
D)Presence of rudimentary chloroplasts in bundle sheath cells and typical granal chloroplast in mesophyll cells

Answer 1

Hint: Plants like maize, sorghum, have different anatomical adaptations for photosynthesis. The mesophyll cells surround the bundle sheath cells. In C4 plants the light dependent reactions and the Calvin cycle occurs at the places.

Complete answer:
To solve this question, we must know about the adaptation in C4 plants.
The C4 plants the energy dependent reaction called the photorespiration does not take place so as to minimise the wastage of energy. The C4 plants have special anatomy called the kranz anatomy where the mesophyll cells cluster around the bundle sheath cells and form a ring.
Due to this Carbon dioxide is first fixed into a 4-carbon compound in the mesophyll cells as the chloroplast is present in the bundle sheath cells. Thus they are known as C4 plants.
The Chloroplast present in the mesophyll cells is the characteristic of C3 plants.
Mesophyll cells have large developed grana whereas bundle sheath cells do not have grana. Hence option C and D are incorrect.

Hence, the correct answer is option (A)

Note: The C4 plants are adapted for hot climatic conditions. The stomata of these plants remain closed for a longer duration. These adaptations help the plant to minimise the water loss. Also the absence of photorespiration helps them in minimising the energy loss.