Which of the following is correct ?

Options

A. Spores are invariably haploid
B. Gametes are generally haploid
C. Both spores and gametes are invariably haploid
D. Gametes are invariably haploid

Answer

To solve the question regarding which statement is correct about spores and gametes, we can analyze each option step by step.

### Step 1: Understand the nature of spores
- Spores can be formed through mitosis or meiosis, depending on the organism. In lower plants like algae, bryophytes, and pteridophytes, spores can be either haploid or diploid.
- **Hint:** Remember that spores can be produced by both mitotic and meiotic divisions.

### Step 2: Understand the nature of gametes
- Gametes are always produced through meiosis, which results in haploid cells. Therefore, gametes are invariably haploid.
- **Hint:** Recall that gametes are the reproductive cells and are always haploid.

### Step 3: Analyze the statements
1. **Spores are invariably haploid.**
- This statement is incorrect because spores can be diploid.

2. **Gametes are generally haploid.**
- This statement is also incorrect because gametes are not just generally haploid; they are invariably haploid.

3. **Both spores and gametes are invariably haploid.**
- This statement is incorrect, as spores can be diploid.

4. **Gametes are invariably haploid.**
- This statement is correct because gametes are always produced through meiosis, resulting in haploid cells.

### Conclusion
After analyzing all the statements, the only correct statement is:
- **D: Gametes are invariably haploid.**

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