Which of the following is correct statement

Options

A. Gametes are diploid
B. Spores are invariably haploid
C. Spores and gametes are invariably haploid
D. Gametes are invariably haploid

Explanation

To determine the correct statement regarding gametes and spores, we can analyze each option based on the information provided in the video transcript.

### Step-by-Step Solution:

1. **Understanding Gametes**:
- Gametes are the reproductive cells involved in sexual reproduction. They are formed through meiosis, which is a type of cell division that reduces the chromosome number by half.
- Therefore, gametes are always haploid (n), meaning they contain one set of chromosomes.

2. **Understanding Spores**:
- Spores are also produced through meiosis but can have different ploidy levels.
- Spores can be haploid (n) or diploid (2n) depending on the organism and the specific life cycle stage.

3. **Analyzing the Statements**:
- **Statement 1**: "Gametes are diploid."
- This statement is incorrect because gametes are haploid.
- **Statement 2**: "Spores are invariably haploid."
- This statement is incorrect because spores can be either haploid or diploid.
- **Statement 3**: "Spores and gametes are invariably haploid."
- This statement is incorrect because, while gametes are always haploid, spores can be either haploid or diploid.
- **Statement 4**: "Gametes are invariably haploid."
- This statement is correct because gametes are always formed as haploid cells.

4. **Conclusion**:
- The correct statement among the options is that "gametes are invariably haploid."

### Final Answer:
The correct statement is: **Gametes are invariably haploid.**

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