Bryophytes are amphibious of plant kingdom as their

Options

A. Reproductive phase requires water
B. Sex organs are multicellular and jacketed
C. Conducting strands have tracheids
D. All the above.

Answer

### Step-by-Step Text Solution:

1. **Understanding Bryophytes**: Bryophytes are non-vascular plants that include mosses, liverworts, and hornworts. They are often found in moist environments and are known for their ability to live both in water and on land.

2. **Amphibious Nature**: The term "amphibious" refers to organisms that can live both in water and on land. Bryophytes are considered amphibious because they thrive in terrestrial habitats but require water for certain life processes.

3. **Reproductive Phase**: The reproductive phase of bryophytes is dependent on water. This is because their sperm cells are motile and need to swim through water to reach the egg cells for fertilization. This highlights their reliance on water for reproduction.

4. **Sex Organs**: Bryophytes have multicellular and jacketed sex organs, which are adaptations for their reproductive processes. However, this characteristic alone does not define their amphibious nature.

5. **Conducting Strains**: Bryophytes do not have true vascular tissues like tracheids or vessels found in higher plants. Instead, they have simple conducting tissues, which means the statement about conducting strains having tracheids is incorrect.

6. **Conclusion**: Given that the defining characteristic of bryophytes being amphibious is their requirement for water during the reproductive phase, the correct answer to the question is option A: "Reproductive phase requires water."