In a typical angiosperm anther

Options

A. a longitudinal groove runs lengthwise separating the theca
B. a transeverse groove separate the theca
C. each lobe having two theca
D. both 1 and 3 are correct

Answer

### Step-by-Step Solution:

1. **Identify the Structure of the Anther**:
- The anther is a part of the stamen, which is the male reproductive structure of flowering plants (angiosperms). It consists of two main parts: the filament (the stalk) and the anther itself.

2. **Understand the Lobes and Tika**:
- A typical anther is bilobed, meaning it has two lobes. Each lobe is referred to as a "tika." Therefore, the anther can be described as having two tikas.

3. **Examine the Longitudinal Groove**:
- Between the two tikas, there is a longitudinal groove that runs lengthwise. This groove separates the two lobes of the anther.

4. **Microsporangia**:
- Each tika contains two microsporangia, which are the structures that produce microspores (male gametes). Thus, in total, there are four microsporangia in a typical anther (two in each tika).

5. **Dehiscence**:
- When the anther matures, it undergoes dehiscence, which is the process of opening to release the microspores. This occurs along the line of dehiscence, which is typically located at the groove.

6. **Evaluate the Statements**:
- **Statement 1**: "A longitudinal groove runs lengthwise separating the tika." - This statement is correct.
- **Statement 2**: "A transverse groove separates the tika." - This statement is incorrect as the groove is longitudinal, not transverse.
- **Statement 3**: "Each lobe having two tika." - This statement is incorrect because each tika has two lobes, not the other way around.
- **Statement 4**: "Both 1 and 3 are correct." - This statement is incorrect since only statement 1 is correct.

7. **Conclusion**:
- The correct answer is option A, as it is the only statement that accurately describes the structure of a typical angiosperm anther.