Read the given statements about algae and select the correct option:
(i). Plant body is thalloid
(ii). They are largely aquatic.
(iii). Reproduction occurs by vegetative, asexual and secual methods.
(iv). Chlamydomonas, volvox and Ulothrix are the multicellular algae.

Options

A. Statement I and II are true
B. Statement ii and iii are true.
C. statements (i),(ii) and (iii) are ture.
D. All statements are true.

Explanation

To solve the question regarding the statements about algae, we will analyze each statement one by one and determine their correctness.

### Step-by-Step Solution:

1. **Statement (i): Plant body is thalloid.**
- Algae do indeed have a plant body that is thalloid. This means that their structure is not differentiated into roots, stems, and leaves like higher plants. Instead, they have a simple body structure that is flat and leaf-like.
- **Conclusion:** This statement is **True**.

2. **Statement (ii): They are largely aquatic.**
- Algae are primarily found in aquatic environments, including both freshwater and marine ecosystems. They thrive in water, which is essential for their survival and reproduction.
- **Conclusion:** This statement is **True**.

3. **Statement (iii): Reproduction occurs by vegetative, asexual, and sexual methods.**
- Algae can reproduce in various ways: vegetatively (e.g., fragmentation), asexually (e.g., through spores), and sexually (e.g., fusion of gametes). This diversity in reproduction methods is a characteristic feature of algae.
- **Conclusion:** This statement is **True**.

4. **Statement (iv): Chlamydomonas, Volvox, and Ulothrix are multicellular algae.**
- Chlamydomonas is a unicellular green alga, while Volvox is a colonial alga, and Ulothrix is filamentous. Therefore, not all of these examples are multicellular; Chlamydomonas is specifically unicellular.
- **Conclusion:** This statement is **False**.

### Final Evaluation:
- Statements (i), (ii), and (iii) are true, while statement (iv) is false. Therefore, the correct option includes statements 1, 2, and 3.

### Correct Option:
- The correct option is **Option 3**: Statements 1, 2, and 3 are true.

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