Which of the following statement is correct?

Options

A. Small number of gametes are released by animals performing external fertilisation
B. Chimpanzee exhibits oestrous cycle
C. Oviparous animals always lay fertilised eggs covered by hard calcareous shell
D. The type of parthenogenesis observed in honeybees is arrhenotoky

Answer

To determine which of the given statements is correct, let's analyze each statement one by one.

### Step-by-Step Solution:

1. **Evaluate Statement 1**:
- **Statement**: "Small number of gametes are released by animals performing external fertilization."
- **Analysis**: This statement is incorrect. Animals that perform external fertilization, such as fish and frogs, release a large number of gametes to increase the chances of fertilization, as the gametes are released into water where they may be consumed or destroyed by other organisms.

2. **Evaluate Statement 2**:
- **Statement**: "Chimpanzee exhibits oestrus cycle."
- **Analysis**: This statement is also incorrect. Chimpanzees, being advanced mammals, exhibit a menstrual cycle rather than an estrous cycle. The estrous cycle is typical of many non-primate mammals.

3. **Evaluate Statement 3**:
- **Statement**: "Oviparous animals always lay fertilized eggs covered by hard calcareous shells."
- **Analysis**: This statement is incorrect as well. Oviparous animals do not always lay fertilized eggs; they can lay unfertilized eggs too. The statement also incorrectly implies that all oviparous eggs have hard calcareous shells, which is not true for all species.

4. **Evaluate Statement 4**:
- **Statement**: "The type of parthenogenesis observed in honey bees is Arenotarchy."
- **Analysis**: This statement is correct. In honey bees, parthenogenesis occurs where unfertilized eggs develop into male bees (drones), which is classified as Arenotarchy.

### Conclusion:
- After evaluating all four statements, it is clear that **Statement 4** is the only correct statement.

### Final Answer:
The correct statement is: **"The type of parthenogenesis observed in honey bees is Arenotarchy."**

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