Which of the following statement is correct regarding liverworts ?

Options

A. The thallus is dorsiventral and closely appressed to the substrate
B. They are monoecious as well as dioecious
C. Asexual reproduction by fragements or gemma cups.
D. More than one option is correct

Answer

To determine which statement is correct regarding liverworts, let's analyze each option step by step.

### Step 1: Analyze the first statement
- **Statement**: The thallus is dorsiventral and closely appressed to the substrate.
- **Explanation**: Liverworts have a thallus that is indeed dorsiventral, meaning it has two distinct surfaces (upper and lower). The thallus is typically flat and closely attached to the ground or substrate, which is characteristic of liverworts.
- **Conclusion**: This statement is correct.

### Step 2: Analyze the second statement
- **Statement**: They are monoecious as well as dioecious.
- **Explanation**: Liverworts can be either monoecious (having both male and female reproductive organs on the same plant) or dioecious (having male and female reproductive organs on separate plants). This variability is true for many liverwort species.
- **Conclusion**: This statement is also correct.

### Step 3: Analyze the third statement
- **Statement**: Asexual reproduction by fragments or gemmae.
- **Explanation**: Liverworts reproduce asexually through fragmentation and by producing gemmae, which are small, multicellular structures that can grow into new individuals. Gemmae are produced in cup-like structures on the thallus surface.
- **Conclusion**: This statement is correct as well.

### Step 4: Analyze the fourth statement
- **Statement**: More than one option is correct.
- **Explanation**: Since we have established that the first three statements are correct, this statement logically follows.
- **Conclusion**: This statement is correct.

### Final Answer
Since all the statements regarding liverworts are correct, the answer is:
**D: More than one option is correct.**

---