Read the following statements regarding sexual reproduction and select the set of correct statements.
(a.) Sexual reproduction mostly involves 2 parents.
(b.) It generally involves gametic fusion.
(c.) Meiosis does not occur in sexual reproduction.
(d.) External fertilization is a characteristic of sexual reproduction.

Options

A. a and c
B. a and b
C. c and d
D. a , b and d

Answer

To solve the question regarding the statements about sexual reproduction, we will analyze each statement one by one:

1. **Statement (a): Sexual reproduction mostly involves 2 parents.**
- This statement is **correct**. Sexual reproduction typically involves two parents, one male and one female, contributing gametes (sperm and egg) for the formation of offspring.

2. **Statement (b): It generally involves gametic fusion.**
- This statement is also **correct**. Sexual reproduction involves the fusion of male and female gametes, which leads to the formation of a zygote.

3. **Statement (c): Meiosis does not occur in sexual reproduction.**
- This statement is **incorrect**. Meiosis is a crucial part of sexual reproduction as it reduces the chromosome number by half to produce haploid gametes (sperm and egg).

4. **Statement (d): External fertilization is a characteristic of sexual reproduction.**
- This statement is **incorrect**. While some organisms (like many fish and amphibians) do undergo external fertilization, sexual reproduction can also occur through internal fertilization (as seen in mammals). Therefore, it is not a defining characteristic of sexual reproduction.

Based on the analysis of the statements:
- The correct statements are (a) and (b).

### Final Answer:
The correct set of statements regarding sexual reproduction is:
- (a) Sexual reproduction mostly involves 2 parents.
- (b) It generally involves gametic fusion.