Which of the following is false about external fertilization?

Options

A. Organisms showing external fertilization exhibit great synchrony between the sexes and release gametes
B. Gametes are produced in large number in water to enhance the chances of fertilization
C. A large number of gametes are wasted
D. A major advantage is that the offsprings are protected from predators and there is a great chance of their survival upto adult hood

Answer

To determine which statement is false about external fertilization, let's analyze the options provided step by step.

### Step 1: Understand External Fertilization
External fertilization occurs when the male and female gametes unite outside the female's body. This process is common in aquatic organisms such as fish and amphibians.

### Step 2: Analyze Each Option
1. **Option 1:** Organisms showing external fertilization exhibit great synchronicity between the sexes and release gametes.
- **Explanation:** This statement is true. In external fertilization, males and females often release their gametes simultaneously to increase the chances of fertilization.

2. **Option 2:** If the male gametes are produced in large numbers into water, it will enhance the chances of fertilization.
- **Explanation:** This statement is also true. Producing a large number of male gametes increases the likelihood that some will encounter and fertilize female gametes.

3. **Option 3:** If the male gametes are produced in large numbers into water, it will enhance the chances of fertilization.
- **Explanation:** This statement is a repetition of Option 2 and is true for the same reasons.

4. **Option 4:** If the male gametes are produced in large numbers into water, it will enhance the chances of fertilization.
- **Explanation:** This statement is again a repetition of Options 2 and 3 and is true.

### Step 3: Identify the False Statement
Since Options 1, 2, 3, and 4 are all true, it appears that there may have been an error in the question or the options provided. However, if we were to assume that one of the options is indeed false, we would need to look for inconsistencies or misinterpretations in the context of external fertilization.

### Conclusion
Based on the analysis, all the provided statements regarding external fertilization are true. If the question asks for a false statement, it may be misleading or incorrectly framed.