$ Formation of motile gametes occurs in Red Algae.
! Motile gametes in Cycas are muticiliated.

Options

A. If both As and R are correct and R is correct explanation of As
B. If both As and R are correct but R is not correct explanation of As
C. If As is correct, R is wrong
D. If both As and R are wrong.

Answer

### Step-by-Step Solution

1. **Understanding the Assertion**: The assertion states that "Formation of motile gametes occurs in Red Algae." We need to evaluate the truth of this statement.

2. **Identifying Red Algae**: Red algae are scientifically known as Rhodophyceae. It is important to note the characteristics of this group of algae.

3. **Gamete Mobility in Red Algae**: In red algae, both male and female gametes are non-motile. They do not have the ability to move on their own but can be transported by water currents. This indicates that the assertion is incorrect.

4. **Understanding the Reason**: The reason states that "Motile gametes in Cycas are multiciliated." We need to evaluate this statement as well.

5. **Identifying Cycas**: Cycas is a genus of plants that are often referred to as cycads. They are characterized by their palm-like appearance and are considered evergreen.

6. **Gamete Mobility in Cycas**: In Cycas, the male gametes are indeed motile and possess multiple cilia, which allows them to swim. This means that the reason provided is correct.

7. **Evaluating the Options**: Now we need to evaluate the options based on our findings:
- Option 1: Both assertion and reason are correct, and the reason is the correct explanation of the assertion. (Incorrect)
- Option 2: Both assertion and reason are correct, but the reason is not the correct explanation of the assertion. (Incorrect)
- Option 3: Assertion is correct, reason is wrong. (Incorrect)
- Option 4: Both assertion and reason are wrong. (Incorrect)

Since the assertion is wrong and the reason is correct, none of the options accurately reflect this.

8. **Conclusion**: The assertion is false, and the reason is true. Therefore, the correct conclusion is that the assertion is incorrect while the reason is correct.