Select an incorrect statement about gemmae?

Options

A. Gemmae are green, multicellular, sexual buds
B. Gemmae develop in small receptacles called gemma cups located on the thalli.
C. Gemmae become detached from the parent body and germinate to form new individuals
D. Gemmae are biconcave stalked structures

Answer

To determine the incorrect statement about gemmae, we will analyze each of the provided statements one by one.

1. **Statement 1**: "Gemmae are green multicellular sexual buds."
- This statement is incorrect. Gemmae are actually asexual reproductive structures, not sexual buds. They are multicellular but are involved in asexual reproduction.

2. **Statement 2**: "Gemmae develop in small receptacles called gemma cups located on the thallus."
- This statement is correct. Gemmae indeed develop in specialized structures known as gemma cups, which are found on the thallus of liverworts.

3. **Statement 3**: "Gemmae become detached from the parent body and germinate to form new individuals."
- This statement is also correct. Gemmae detach from the parent plant and can grow into new individuals, which is a characteristic of asexual reproduction.

4. **Statement 4**: "Gemmae are bi-concave structures."
- This statement is correct as well. Gemmae are often described as bi-concave in shape.

Based on the analysis, the incorrect statement about gemmae is **Statement 1**: "Gemmae are green multicellular sexual buds."

### Step-by-Step Solution:
1. **Identify the statements about gemmae.**
2. **Analyze each statement for accuracy.**
3. **Determine which statement is incorrect.**
4. **Conclude that the first statement is incorrect.**