Question

Question 45.1
Observe the diagram and answer the following.

(a) Which group of plants exibit these two types of cells?

(b) What is the first product of $C_4$ cycle?

(c) Which enzyme is there in bundle sheath cells and mesophyll cells?

Answer 1

(a) Monocot plants belonging to Graminae/Poaceae family, e.g., sugarcane, maize etc., possess these two types of cells. i.e., bundle sheath and mesophyll cell (in kranz anatomy).

(b) A 4-carbon compound oxaloacetic acid is (the first product of $C_4$ cycle.

(c) Mesophyll cells have PEP carboxylase to fix atmospheric $C{O}_2$ to form a 4-carbon compound oxalo acetic acid, whereas bundle sheath cells have RuBP carboxylase which fix $CO-2$ by this enzyme to form 3-arbon compound 3 PGA (3 phosphoglyceric acid).