Read the following statements carefully: A. The hard outer layer of the pollen grain called exine is made up of sporopollenin which can withstand high temperatures. B. The inner wall of the pollen grain, intine, is a continuous layer made up of cellulose and pectin. C. The innermost wall layer of the microsporangium, tapetum, helps in the dehiscence of anther to release the pollen. D. Sporopollenin can be degraded by

Step-by-step solution

Statement A is correct: The exine is the hard outer layer of the pollen grain, composed of sporopollenin, which is highly resistant to high temperatures, strong acids, and alkalis. Statement B is correct: The intine is the inner wall of the pollen grain. It is a thin, continuous layer made up of cellulose and pectin. Statement C is incorrect: The tapetum is the innermost wall layer of the microsporangium, but its primary function is to nourish the developing pollen grains. The outer three layers (epidermis, endothe