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Some important events that take place du...

Some important events that take place during fertilisation are given below. Arrange the events in a proper sequence and select the correct option.
(i). Cortical reaction
(ii). Sperm entry
(iii). Karyogamy
(iv). Acrosomal reaction

A

`(iv)to(i)to(ii)to(iii)`

B

`(i)to(ii)to(iii)to(iv)`

C

`(iv)to(ii)to(i)to(iii)`

D

`(ii)to(i)to(iii)to(iv)`

Text Solution

AI Generated Solution

The correct Answer is:
To arrange the events that take place during fertilization in the correct sequence, we can follow these steps: ### Step-by-Step Solution: 1. **Acrosomal Reaction**: The first event that occurs during fertilization is the acrosomal reaction. When a sperm approaches the egg, the acrosome (a cap-like structure on the sperm's head) releases enzymes that help the sperm penetrate the egg's outer layers. 2. **Sperm Entry**: After the acrosomal reaction, the sperm can enter the egg. This is the second event where the sperm penetrates the egg's membrane. 3. **Cortical Reaction**: Once the sperm has entered the egg, the cortical reaction occurs. This involves the release of cortical granules from the egg, which prevents other sperm from entering (a process known as blocking polyspermy). 4. **Karyogamy**: The final event is karyogamy, where the nuclei of the sperm and egg fuse together. This results in the formation of a diploid zygote, combining the genetic material from both parents. ### Correct Sequence: - (iv) Acrosomal reaction - (ii) Sperm entry - (i) Cortical reaction - (iii) Karyogamy Thus, the correct option is the one that lists these events in the order: **Acrosomal reaction → Sperm entry → Cortical reaction → Karyogamy**.
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