Which one of the following statements is not true

Options

A. Pollen grains are released from anthers at 2-celled state
B. Sporogenous cell directly behaves as the megaspore mother cell
C. Megaspore divides twice to form an eight nucleate embryosac
D. Egg and synergids always lie near the micropylar end of ovule

Explanation

To determine which statement is not true, we will analyze each statement provided in the question step by step.

### Step 1: Analyze the first statement
- **Statement**: Pollen grains are released from anthers at the two-cell stage.
- **Analysis**: This statement is true. Pollen grains, which are microspores, are indeed released from the anthers of flowering plants when they reach the two-cell stage, comprising a generative nucleus and a vegetative nucleus.

### Step 2: Analyze the second statement
- **Statement**: Sporogenous cells directly behave as the megaspore mother cell.
- **Analysis**: This statement is also true. Sporogenous cells can differentiate into megaspores, and the megaspore mother cell is derived from sporogenous cells.

### Step 3: Analyze the third statement
- **Statement**: The megaspore divides twice to form an 8-nucleate embryo sac.
- **Analysis**: This statement is incorrect. The megaspore undergoes three mitotic divisions to form an 8-nucleate embryo sac, not two divisions. Therefore, this statement is not true.

### Step 4: Analyze the fourth statement
- **Statement**: An egg and synergids are always located near the micropyle end of the ovule.
- **Analysis**: This statement is true. In the ovule, the egg cell and synergids are positioned at the micropyle end, while antipodal cells are found at the chalazal end.

### Conclusion
After analyzing all the statements, the statement that is not true is the third one: "The megaspore divides twice to form an 8-nucleate embryo sac."

### Final Answer
The statement that is not true is: "The megaspore divides twice to form an 8-nucleate embryo sac."

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