Which of the following statements regarding pollen grains is/are fals...
The intine is the inner wall of a pollen grain that is made up of cellulose and pectin. Exine is the outer protective layer of the pollen grains.
The outer wall or exine of pollen grains contains sporopollenin. It is one of the most resistant organic compounds known. It protects pollen grains from external factors such as temperature, acid, alkali, etc.
Mature pollen has two cells:
- Generative cell
- Vegetative cell
Which of the following statements regarding pollen grains is/are fals...
D. Only C is false.
Explanation:
A. The hard outer layer of pollen grains is made up of sporopollenin.
- This statement is true. The hard outer layer of pollen grains, known as the exine, is composed of sporopollenin. Sporopollenin is a tough and resistant polymer that helps protect the pollen grain during its journey from the anther to the stigma.
B. A mature pollen grain contains vegetative cell and generative cell.
- This statement is true. A mature pollen grain consists of two cells - the vegetative cell and the generative cell. The vegetative cell is responsible for producing the pollen tube, which helps transport the generative cell to the female reproductive organs. The generative cell is involved in the process of fertilization and gives rise to sperm cells.
C. The exine is the inner wall of a pollen grain that is made up of cellulose and pectin.
- This statement is false. The exine is the outer wall of a pollen grain, not the inner wall. It is made up of sporopollenin, as mentioned earlier, not cellulose and pectin. Cellulose and pectin are components of the pollen grain's intine, which is the inner wall.
Based on the explanations above, the false statement is C) Only B.