External water is not required for fertilization of

Options

A. Cryptogams
B. Bryophytes
C. Petridophytes
D. Spermatophytes

Answer

To solve the question "External water is not required for fertilization of:", we will analyze each option provided and determine which group of plants does not require water for fertilization.

### Step-by-Step Solution:

1. **Understanding the Options**:
- The options given are Cryptogams, Bryophytes, Pteridophytes, and Spermatophytes.
- We need to identify which of these groups does not require external water for fertilization.

2. **Analyzing Cryptogams**:
- Cryptogams include seedless plants such as algae, bryophytes, and pteridophytes.
- In cryptogams, fertilization typically requires water as a medium for the movement of male gametes (sperm) to reach the female gametes (egg).

3. **Analyzing Bryophytes**:
- Bryophytes are non-vascular plants like mosses and liverworts.
- They also require water for fertilization, as the sperm must swim through water to fertilize the egg.

4. **Analyzing Pteridophytes**:
- Pteridophytes are vascular plants that reproduce via spores, such as ferns.
- Similar to bryophytes, pteridophytes need water for the sperm to swim to the egg for fertilization.

5. **Analyzing Spermatophytes**:
- Spermatophytes are seed-producing plants, which include gymnosperms and angiosperms.
- In this group, fertilization does not require water. The male gametes (pollen) are carried by wind or animals to the female gametes, making water unnecessary for fertilization.

6. **Conclusion**:
- Since only Spermatophytes do not require external water for fertilization, the correct answer is **Spermatophytes**.

### Final Answer:
External water is not required for fertilization of **Spermatophytes**.