Which is not characteristic of bryophytes

Options

A. Main plant body is haploid
B. They possess multicellular sex organs
C. Have well differentiated vascular tissues.
D. They need water for sexual reproduction

Answer

To determine which characteristic is not true for bryophytes, we will analyze each option provided in the question step by step.

### Step 1: Analyze the first option - "Main plant body is diploid"
- Bryophytes primarily have a gametophyte stage that is haploid (n). The diploid phase (sporophyte) is dependent on the gametophyte for nutrition and support.
- **Conclusion**: This statement is **true** for bryophytes, as their main plant body is haploid.

**Hint**: Remember that in bryophytes, the dominant phase is the gametophyte, which is haploid.

### Step 2: Analyze the second option - "They possess multicellular sex organs"
- Bryophytes do indeed have multicellular sex organs. The male sex organ is called antheridium, and the female sex organ is called archegonium.
- **Conclusion**: This statement is **true** for bryophytes.

**Hint**: Think about the reproductive structures of bryophytes and their multicellular nature.

### Step 3: Analyze the third option - "Have well differentiated vascular tissues"
- Bryophytes are non-vascular plants, meaning they lack well-defined vascular tissues such as xylem and phloem. They have simple water-conducting cells but no true vascular system.
- **Conclusion**: This statement is **not true** for bryophytes, as they do not have well differentiated vascular tissues.

**Hint**: Recall that bryophytes rely on diffusion for water movement due to the absence of vascular tissues.

### Step 4: Analyze the fourth option - "They need water for sexual reproduction"
- Bryophytes require water for the transfer of sperm to the egg during fertilization. The sperm swims through water to reach the egg.
- **Conclusion**: This statement is **true** for bryophytes.

**Hint**: Consider the role of water in the reproductive process of bryophytes.

### Final Conclusion:
The characteristic that is **not true** for bryophytes is: **"Have well differentiated vascular tissues."**

This is the correct answer to the question posed.