Select the correct statement from the following

Options

A. hanging drop method as in vivo germination of pollen grain
B. obturator directs the growth of pollen tibe twoards mircropyle of seed
C. there are many embryos of different sized and shapes in the seeds of orange
D. embryo arises parthenogenetically from the diploid egg in adventive embryony

Answer

To solve the question of selecting the correct statement from the provided options, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Analyze the First Statement:**
- The first statement claims that the hanging drop method is used for in vivo germination of pollen grains.
- **Explanation:** The hanging drop method is a laboratory technique used to observe the germination of pollen grains in a controlled environment, which is not a natural (in vivo) setting. Therefore, this statement is incorrect.

2. **Analyze the Second Statement:**
- The second statement states that the obturator directs the growth of the pollen tube towards the micropyle of seeds.
- **Explanation:** The obturator does guide the growth of the pollen tube, but it directs it towards the micropyle of the ovule (not the seed). Hence, this statement is also incorrect.

3. **Analyze the Third Statement:**
- The third statement mentions that there are many embryos of different sizes and shapes in the seeds of orange.
- **Explanation:** In citrus fruits like oranges, it is indeed true that there can be multiple embryos of varying sizes and shapes within the seeds. This statement is correct.

4. **Analyze the Fourth Statement:**
- The fourth statement says that the embryo arises pathogenetically from the diploid egg in adventive embryony.
- **Explanation:** In adventive embryony, embryos can form from cells other than the zygote, and this process does not involve the diploid egg directly. Therefore, this statement is incorrect.

### Conclusion:
- After analyzing all statements, the correct statement is: **"There are many embryos of different sizes and shapes in the seeds of orange."**