Question

Discontinuous layers in the wall of pollen grain are

• A. Absent
• B. Foot layer
• C. Baculate layer
• D. Baculate layer and tectum

Answer 1

The correct option is D Baculate layer and tectum

• Pollen wall comprises of two layers: outer layer exine and inner layer intine. The exine is chemically differentiated into two layers: an outer layer called "ektexine" and an inner layer called "endexine". Ektexine is further comprised of tectum, bacula and a foot layer.
• Above the foot layer is present a layer of rod like elements called columella or bacula, which is covered over by a roof like layer called the tectum.
• The Tectum and Bacula layers form different patterns on the pollen grains as they are discontinuous at some regions and thus various types of sculptured patterns are seen in pollen grains.

So, the correct answer is D.