Question

Sporopollenin is part of
A. Pollen grain covering
B. Oosphere covering
C. Ovule covering
D. Cell wall

Answer 1

Hint: Sporopollenin is a biochemical substance that is present in the exine wall. It is very stable, and well preserved in sediments and soils. It cannot be chemical degraded by inorganic or organic substances.

Complete answer:
Pollen grains are the part of a male flower. Pollen grains are male gametophytes. It is produced by anther. It is like a yellowish powdery form. Pollen grains are spherical in shape and made up of two layers called intine and exine. The inner layer of pollen grains is intine. This layer is made up of pectin and cellulose. The inner layer of the pollen grain is a thin and continuous layer. The outer layer of a pollen grain called exine is made up of sporopollenin substance. Sporopollenin is a biochemical substance that is inert. Therefore it can withstand high temperatures and other harsh weather conditions. These substances protected the pollen grains in all harsh conditions.

Therefore option A is correct that sporopollenin is a part of pollen grain covering.
Hence options B, C, and D are incorrect because sporopollenin substance does not present in any of these covers.

Additional information: Pollen grains may also cause allergy. It may often lead to acute to chronic respiratory diseases also. Pollen grains rich in many nutrients, so in western countries, pollen grains in the form medicines take as food supplements.

Note: Germ pores prominent apertures of pollen grains where sporopollenin is absent. So far no enzymes can degrade sporopollenin. As the sporopollenin is present in pollen grains, pollen grains are persevered as fossil fuel.