What is common in Thallphytes, Bryophytes and pteridophytes?

Options

A. Dependence on water
B. Presence of conductive system
C. Presence of cones
D. Absence of vascular tissue.

Answer

To answer the question "What is common in Thallophytes, Bryophytes, and Pteridophytes?", we can follow these steps:

### Step 1: Define the Groups
- **Thallophytes**: These are simple, non-differentiated plants, often aquatic, that do not have true roots, stems, or leaves. Examples include algae and fungi.
- **Bryophytes**: These are small, non-vascular plants that typically grow in moist environments. They include mosses and liverworts and are known as the amphibians of the plant kingdom because they can live both in water and on land.
- **Pteridophytes**: These are vascular plants that reproduce via spores and include ferns. They are usually found in moist environments as well.

### Step 2: Identify Common Features
- All three groups (Thallophytes, Bryophytes, and Pteridophytes) have a common requirement for water for reproduction.
- They depend on water for their reproductive processes, particularly for the movement of sperm to the egg during fertilization.

### Step 3: Analyze the Options
- **Dependence on Water**: This is true for all three groups as they require water for reproduction.
- **Presence of Conductive System**: This is only present in Pteridophytes, as they have vascular tissues.
- **Presence of Cones**: This is not applicable to Thallophytes and Bryophytes; cones are found in gymnosperms.
- **Absence of Vascular Tissue**: This is true for Thallophytes and Bryophytes but not for Pteridophytes.

### Conclusion
The common feature among Thallophytes, Bryophytes, and Pteridophytes is their **dependence on water** for reproduction.

### Final Answer
**Dependence on Water**

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