Ncert Exercises & Solutions

46. Suppose Euphorbia and maize are grown in the tropical area.

(a) Which one of them do you think will be able to survive under such conditions?

(b) Which one of them is more efficient in terms of photosynthetic activity?

(a) Euphorbia is a CAM plant. It fixes CO₂ during night and usesit in day time.It will be able to survive in hot tropical climate.

(b) Maize being a C₄ plant is more efficient in terms of photosynthetic activity as it is able to use CO₂at lower level as well as high O₂ and temperature.

(c) Maize plants show kranz anatomy in their leaves. They have granal chloroplast in mesophyll cells and agranal in bundle sheath cells. Euphorbia does not have C₄ cycle so kranz anatomyis not found in them.

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