How many among the following are haploid structure of bryophytes? Gametophyte, Zygote, Sporophyte, Seta, Rhizoid, Antheridium, Protonima, Antherozoid, Spore, NCC, Archegonium, Oosphere

Options

A. 6
B. 11
C. 9
D. 8

Answer

To determine how many structures among the given list are haploid in bryophytes, we need to analyze each structure and identify its ploidy level. Here’s a step-by-step breakdown:

1. **Identify the Structures**: We have the following structures to analyze: Gametophyte, Zygote, Sporophyte, Seta, Rhizoid, Antheridium, Protonema, Antherozoid, Spore, NCC, Archegonium, and Oosphere.

2. **Determine the Ploidy Level**:
- **Gametophyte**: This is the main plant body of bryophytes and is haploid (N).
- **Zygote**: Formed by the fusion of male and female gametes; it is diploid (2N).
- **Sporophyte**: The structure that arises from the zygote and is also diploid (2N).
- **Seta**: A part of the sporophyte that supports the spore capsule; it is diploid (2N).
- **Rhizoid**: Structures that anchor the gametophyte; they are haploid (N).
- **Antheridium**: The male reproductive organ that produces male gametes; it is haploid (N).
- **Protonema**: The early stage of gametophyte development; it is haploid (N).
- **Antherozoid**: The male gamete; it is haploid (N).
- **Spore**: Produced by the sporophyte through meiosis; it is haploid (N).
- **NCC (Neck Canal Cell)**: Part of the archegonium; it is haploid (N).
- **Archegonium**: The female reproductive organ; it is haploid (N).
- **Oosphere**: The female gamete; it is haploid (N).

3. **Count the Haploid Structures**: Now we will count how many of these structures are haploid:
- Gametophyte (haploid)
- Rhizoid (haploid)
- Antheridium (haploid)
- Protonema (haploid)
- Antherozoid (haploid)
- Spore (haploid)
- NCC (haploid)
- Archegonium (haploid)
- Oosphere (haploid)

Total haploid structures = 9.

4. **Conclusion**: Therefore, the answer to the question is that there are 9 haploid structures among the given options.