In organisms showing internal fertilisation, female gamete is non-motile. Lack of motility is advantageous because it

Options

A. faciitates less expenditure of energy
B. assists in rapid division of female gamete
C. helps the cell to store extra nutrients for rapid embryo development
D. both (a) and (c ).

Answer

**Step-by-Step Solution:**

1. **Understanding Internal Fertilization**:
- In organisms that exhibit internal fertilization, the female gamete (egg) is non-motile, while the male gamete (sperm) is motile. This means that the sperm must travel to the egg for fertilization to occur.

2. **Analyzing the Advantages of Non-Motility**:
- The lack of motility in the female gamete has specific advantages that can be evaluated through different statements.

3. **Evaluating Statement A**:
- The first statement suggests that the non-motility of the female gamete facilitates less expenditure of energy. This is correct because a non-motile egg does not require energy for movement, allowing the organism to conserve energy.

4. **Evaluating Statement B**:
- The second statement claims that the non-motility assists in the rapid division of the female gamete. This is incorrect because the division of the female gamete does not depend on its motility; it can divide independently of whether it is motile or not.

5. **Evaluating Statement C**:
- The third statement states that the non-motility helps the cell to store extra nutrients for rapid embryo development. This is correct because a non-motile egg can allocate more resources to nutrient storage, which is beneficial for the developing embryo.

6. **Conclusion**:
- Based on the evaluations, the correct advantages of the non-motility of the female gamete in internal fertilization are that it facilitates less energy expenditure (Statement A) and helps in storing extra nutrients for embryo development (Statement C). Therefore, the correct answer is both A and C.

**Final Answer**: The lack of motility is advantageous because it facilitates less expenditure of energy and helps the cell to store extra nutrients for rapid embryo development.

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