Question

Middle layers of pollen sac wall are absent in

• A. Compositae
• B. Lemnaceae
• C. Najadaceae
• D. Both B and C

Answer 1

The correct option is D Both B and C

The pollen sac wall usually comprises of an outer layer of epidermis. This is followed by the subepidermal layer of endothecium. Endothecium is then followed by 2 to 3 middle layers and an inner most single-layered tapetum. The middle layers store food in some taxa that is used by pollen mother cells. The middle layers of pollen sac wall are absent in the members of Lemnaceae and Najadaceae.

Thus, the correct answer is option D.