Consider the following statements: a. All oviparous organisms exhibit external fertilization. b. Hermaphrodites can show cross fertilization. c. New individual can develop from ovum (without fusion with sperm) .Which of the above mentioned statements are incorrect?

Options

A. a & c
B. b & a
C. only a
D. b & c

Answer

To determine which of the statements are incorrect, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Analyze Statement A**: "All oviparous organisms exhibit external fertilization."
- **Definition**: Oviparous organisms are those that lay eggs.
- **Evaluation**: While many oviparous organisms do exhibit external fertilization (like many fish and amphibians), there are also oviparous organisms that fertilize their eggs internally (like birds and reptiles). Therefore, this statement is **incorrect**.

2. **Analyze Statement B**: "Hermaphrodites can show cross fertilization."
- **Definition**: Hermaphrodites are organisms that possess both male and female reproductive organs.
- **Evaluation**: Hermaphrodites can indeed undergo cross-fertilization (where two individuals exchange sperm) as well as self-fertilization (where an individual fertilizes its own eggs). Therefore, this statement is **correct**.

3. **Analyze Statement C**: "New individual can develop from ovum (without fusion with sperm)."
- **Definition**: This process is known as parthenogenesis, a form of asexual reproduction.
- **Evaluation**: In parthenogenesis, an egg can develop into a new individual without fertilization by a sperm. This is observed in some species like bees and certain reptiles. Therefore, this statement is **correct**.

### Conclusion:
- The only incorrect statement is **Statement A**: "All oviparous organisms exhibit external fertilization."

### Final Answer:
The incorrect statement is **A** only.