Select the correct options about algae -

Options

A. Some algae are associated with fungi (in lichen) and animals (on sloth bear)
B. Great range in form and size
C. Reproduce by vegetative, asexual and sexual method
D. All

Answer

To answer the question about algae, we will analyze each statement provided in the options and determine their correctness step by step.

### Step-by-Step Solution:

1. **Understanding Algae**:
- Algae are members of the plant kingdom and are characterized by the presence of chlorophyll, which allows them to perform photosynthesis.
- They are primarily aquatic organisms and can be found in various environments.

2. **Association with Fungi and Animals**:
- Some algae do form associations with fungi, which are known as lichens. This symbiotic relationship is beneficial for both organisms.
- Additionally, algae can also be found in association with certain animals, such as sloths, where they live on the fur of these animals.
- **Conclusion**: This statement is **correct**.

3. **Range in Form and Size**:
- Algae exhibit a wide range of forms and sizes. They can be unicellular (like Chlamydomonas), multicellular (like giant kelp), filamentous, or even colloidal.
- This variability allows algae to thrive in various ecological niches.
- **Conclusion**: This statement is **correct**.

4. **Reproductive Methods**:
- Algae can reproduce through various methods: vegetative (asexual), asexual (like binary fission), and sexual reproduction (involving gametes).
- This diversity in reproductive strategies contributes to their adaptability and survival in different environments.
- **Conclusion**: This statement is **correct**.

### Final Conclusion:
All the statements regarding algae are correct. Therefore, the correct options about algae are:
1. Some algae are associated with fungi and lichen and animals on sloth beer.
2. There is a great range in form and size.
3. Algae reproduce by vegetative, asexual, and sexual methods.