Which is true of taenia ?

Options

A. Anterior proglottides contain male organs while ripe proglottids have uterus filled with eggs
B. all proglottides have both male and female organs
C. female organs are confined to anterior proglottides .
D. Male organs are confined to posterior proglottides.

Answer

To determine which statement is true regarding Taenia, we need to analyze the characteristics of its proglottids. Here’s a step-by-step breakdown of the information provided:

### Step 1: Understanding Taenia Structure
- Taenia, commonly known as tapeworms, has a body structure called strobila, which is segmented into parts known as proglottids.
- The growth of Taenia starts from the neck region, and as new proglottids form, the older ones move towards the posterior end.

**Hint:** Remember that the growth of Taenia starts from the neck, and the oldest proglottids are located at the posterior end.

### Step 2: Types of Proglottids
- There are three types of proglottids:
1. Immature proglottids (located towards the neck)
2. Mature proglottids (located in the middle)
3. Gravid proglottids (located at the posterior end and are the oldest)

**Hint:** Identify the locations of immature, mature, and gravid proglottids to understand their functions.

### Step 3: Reproductive Organs in Proglottids
- Each mature proglottid contains both male and female reproductive organs.
- The male organs consist of numerous testes, and the female organs include a bilobed ovary, both of which open into a common genital pore.

**Hint:** Focus on the fact that mature proglottids have both male and female reproductive systems.

### Step 4: Evaluating the Statements
Now, let's evaluate the statements provided in the question:

1. **Anterior proglottids contain male organs while right proglottids have uterus filled with eggs.**
- This statement is **false** because anterior proglottids are immature and do not contain male organs.

2. **All proglottids have both male and female organs.**
- This statement is **true** for mature proglottids, as they contain both male and female reproductive systems.

3. **Female organs are confined to anterior proglottids.**
- This statement is **false** because female organs are present in mature proglottids, not just confined to the anterior ones.

4. **Male organs are confined to posterior proglottids.**
- This statement is also **false** since male organs are present in all mature proglottids.

### Conclusion
Based on the evaluation, the correct statement about Taenia is that **all proglottids have both male and female organs** (specifically referring to mature proglottids).

**Final Answer:** The correct statement is: **All proglottids have both male and female organs.**