Pollen grain is related to embryo sac as

Options

A. sperm to egg
B. male gametophyte to female gametophyte
C. male gametophyte to egg
D. sperm to female gametophyte

Answer

To solve the question "Pollen grain is related to embryo sac as", we need to analyze the relationship between pollen grains and embryo sacs in the context of flowering plants' reproduction. Here's a step-by-step breakdown:

### Step 1: Identify the Key Terms
- **Pollen Grain**: This is the male gametophyte in flowering plants. It contains the male gametes (sperm cells).
- **Embryo Sac**: This is the female gametophyte, which contains the egg cell and other cells necessary for fertilization.

### Step 2: Understand the Function of Each Structure
- The **pollen grain** is responsible for delivering sperm cells to the ovule, where fertilization occurs.
- The **embryo sac** contains the egg cell that will be fertilized by the sperm from the pollen grain.

### Step 3: Analyze the Options Given
1. **Sperm to Egg**: This is incorrect because it does not represent the relationship between pollen grain and embryo sac.
2. **Male Gametophyte to Female Gametophyte**: This is correct because pollen grain (male gametophyte) relates to the embryo sac (female gametophyte).
3. **Male Gametophyte to Egg**: This is incorrect as it does not encompass the entire structure of the embryo sac.
4. **Sperm to Female Gametophyte**: This is also incorrect because it does not accurately describe the relationship.

### Step 4: Select the Correct Answer
The correct answer is **Male Gametophyte to Female Gametophyte**. This option accurately describes the relationship between pollen grains and embryo sacs.

### Final Answer
**Pollen grain is related to embryo sac as Male Gametophyte is related to Female Gametophyte.**

---