Study the following statements and choose the correct option.
I. Asexual reproduction is common among single celled organisms and organisms with relatively simple organisation
II. Conidia, bud, gemmules are common sexual structures
III. Runner, rhizome, sucker, tuber, offset, bulb are vegetative propagules
IV. The invasive weeds found growing in fresh water bodies is Zostera.

Options

A. I, II are correct
B. III, IV are correct
C. I, III are correct
D. II, IV are correct

Answer

To solve the question, we need to analyze each statement provided and determine whether they are true or false.

### Step-by-Step Solution:

1. **Statement I**: "Asexual reproduction is common among single-celled organisms and organisms with relatively simple organization."
- This statement is **correct**. Asexual reproduction is indeed prevalent in single-celled organisms (like bacteria and protists) and in organisms that have a simpler structure.

2. **Statement II**: "Conidia, bud, gemmules are common sexual structures."
- This statement is **incorrect**. Conidia, buds, and gemmules are structures associated with asexual reproduction, not sexual reproduction. Conidia are asexual spores, buds are outgrowths from the parent organism, and gemmules are a form of asexual reproduction in sponges.

3. **Statement III**: "Runner, rhizome, sucker, tuber, offset, bulb are vegetative propagules."
- This statement is **correct**. All these structures are indeed vegetative propagules that participate in vegetative reproduction, allowing plants to reproduce asexually.

4. **Statement IV**: "The invasive weeds found growing in freshwater bodies is Zostera."
- This statement is **incorrect**. The invasive weed commonly found in freshwater bodies is actually **water hyacinth**, not Zostera. Zostera is a type of seagrass, not an invasive weed.

### Conclusion:
Based on the analysis:
- Statement I is correct.
- Statement II is incorrect.
- Statement III is correct.
- Statement IV is incorrect.

Thus, the correct option that includes the true statements is **Option C**: "First and third statements are correct."