Which is incorrect?

Options

A. Sowing is not a method of vegetative propagation.
B. Estrous cycle is indication of breeding period.
C. External water is required for fertilization of spermatophytes.
D. Banana is multiplied by rhizome

Answer

To determine which statement is incorrect, let's analyze each of the four statements provided:

1. **Sowing is not a method of vegetative propagation.**
- **Analysis:** This statement is correct. Sowing refers to the process of planting seeds, which is a method of sexual reproduction, not vegetative propagation. Vegetative propagation involves the growth of new plants from parts of the parent plant, such as stems, roots, or leaves.

2. **The estrous cycle is an indication of the breeding period.**
- **Analysis:** This statement is also correct. The estrous cycle refers to the recurring physiological changes that are induced by reproductive hormones in most mammalian females, indicating their breeding period. Non-primates, like cats and dogs, exhibit this cycle, which includes periodic changes in the ovaries and ovum production.

3. **External water is required for fertilization of spermatophytes.**
- **Analysis:** This statement is incorrect. Spermatophytes, which include gymnosperms and angiosperms, do not require water for fertilization. Instead, they rely on mechanisms such as wind or animals for pollination. Water is essential for fertilization in other plant groups, such as pteridophytes (ferns).

4. **The banana is multiplied by rhizome.**
- **Analysis:** This statement is correct. Bananas reproduce vegetatively through rhizomes, which are underground stems that can produce new banana plants without the need for fertilization.

**Conclusion:** The incorrect statement is the third one: "External water is required for fertilization of spermatophytes."