Prothallial cells present in the male gametophytes of Pinus are

Options

A. One
B. Two
C. Three
D. Four.

Answer

To answer the question regarding the number of prothallial cells present in the male gametophytes of Pinus, we can follow these steps:

### Step 1: Understand the Male Gametophyte Structure
The male gametophyte of Pinus, which is a type of conifer, develops from pollen grains. Each pollen grain contains a few cells, including prothallial cells.

**Hint:** Recall that the male gametophyte is formed from the microspore and consists of several cells.

### Step 2: Identify the Prothallial Cells
In the male gametophyte of Pinus, there are specifically two prothallial cells. These cells are part of the pollen grain structure and are essential for the development of the male gametophyte.

**Hint:** Focus on the specific types of cells that make up the male gametophyte and their functions.

### Step 3: Recognize the Role of Prothallial Cells
Among the two prothallial cells, one differentiates into a generative cell, while the other becomes a tube cell. The generative cell will later divide to form sperm cells.

**Hint:** Consider the functions of the different types of cells in the male gametophyte and how they contribute to fertilization.

### Step 4: Conclusion
Therefore, the number of prothallial cells present in the male gametophytes of Pinus is 2.

**Hint:** Remember that the question specifically asks for the number of prothallial cells, not their functions or roles.

### Final Answer
The correct answer is 2 prothallial cells.