Which of the following statement is correct ?

Options

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

Answer

To determine which statement is correct among the given options, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Evaluate Option 1:**
- The statement claims that a small number of gametes are released by animals performing external fertilization.
- **Analysis:** Animals that perform external fertilization, such as aquatic amphibians and bony fishes, typically release a large number of gametes into the water to increase the chances of fertilization.
- **Conclusion:** This statement is incorrect.

2. **Evaluate Option 2:**
- The statement claims that chimpanzees exhibit an oestrus cycle.
- **Analysis:** Chimpanzees, being apes, actually exhibit a menstrual cycle, similar to humans. The menstrual cycle involves cyclic changes in the endometrium lining of the uterus.
- **Conclusion:** This statement is also incorrect.

3. **Evaluate Option 3:**
- The statement claims that oviparous animals lay fertilized eggs covered by a hard calcareous shell.
- **Analysis:** Oviparous animals, such as reptiles and birds, do indeed lay fertilized eggs that are often covered by a hard shell made of calcium carbonate (calcareous).
- **Conclusion:** This statement is correct.

4. **Evaluate Option 4:**
- The statement claims that the type of parthenogenesis observed in honey bees is arenotarchy.
- **Analysis:** The correct type of parthenogenesis in honey bees is incomplete parthenogenesis, where males are produced from unfertilized eggs and females from fertilized eggs.
- **Conclusion:** This statement is incorrect.

### Final Conclusion:
- The correct statement among the options is **Option 3**, which states that oviparous animals lay fertilized eggs covered by a hard calcareous shell.

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