A: The higher organisms must evolve a special mechanism for gamete transfer.
R: Male and female gametes are formed in different individuals.

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
B. If both Assertion & Reason are true and the reason is not the correct explanation of the assertion, then mark (2)
C. If Assertion is true statements but Reason is false then mark (3)
D. If both Assertion and Reason are false statements, then mark (4)

Answer

To solve the assertion and reason question, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Assertion (A)**:
- The assertion states that "higher organisms must evolve a special mechanism for gamete transfer." This implies that there is a necessity for a specific method to transfer gametes in higher organisms.

2. **Understanding the Reason (R)**:
- The reason states that "male and female gametes are formed in different individuals." This indicates that in many higher organisms, male and female gametes are produced in separate individuals, necessitating a mechanism for their transfer.

3. **Linking Assertion and Reason**:
- The assertion and reason are interconnected. The need for a special mechanism for gamete transfer arises from the fact that male and female gametes are produced in different individuals. This separation means that a physical or biological process is required to bring the gametes together for fertilization.

4. **Examples of Mechanisms**:
- In animals (like humans), the mechanism is copulation, where the male gametes are transferred to the female through physical mating.
- In plants (like angiosperms), the mechanism is pollination, where pollen (male gametes) is transferred to the stigma of the female reproductive part.

5. **Evaluating the Truth of A and R**:
- Both the assertion and reason are true statements. The assertion is valid because higher organisms do require special mechanisms for gamete transfer. The reason is also true as it accurately describes why such mechanisms are necessary.

6. **Conclusion**:
- Since both the assertion and reason are true, and the reason provides a correct explanation for the assertion, we conclude that the answer is that both are true, and the reason is the correct explanation of the assertion.

### Final Answer:
Both assertion (A) and reason (R) are true, and R is the correct explanation of A.

---