Given below are the following statements regarding actin
(i) Is the main constituent of light band
(ii) Forms the Anisotropic band on its own
(iii) Are te thicker filaments
Are a part of the H zone.
Choose the correct option

Options

A. (i),(ii) and (iii) are true
B. (i) and (iii) are true
C. (ii),(iii) and (iv) are false
D. All are false

Answer

To solve the question regarding the statements about actin, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement (i): Is the main constituent of light band.**
- Actin is indeed the main component of the light band (I band) in muscle fibers. The light band is primarily composed of thin filaments, which are made up of actin. Therefore, this statement is **correct**.

2. **Statement (ii): Forms the Anisotropic band on its own.**
- The anisotropic band (A band) is primarily composed of thick filaments, which are myosin. Actin does not form the A band on its own; it is part of the structure but does not create the A band. Thus, this statement is **incorrect**.

3. **Statement (iii): Are the thicker filaments.**
- Actin filaments are thinner compared to myosin filaments. Myosin is the thicker filament in muscle contraction. Therefore, this statement is also **incorrect**.

4. **Statement (iv): Are a part of the H zone.**
- The H zone is the central part of the A band where only thick filaments (myosin) are present without overlapping with thin filaments (actin). Since actin does not occupy the H zone, this statement is **incorrect**.

### Conclusion:
Based on the analysis:
- The only correct statement is (i): "Is the main constituent of light band."
- The incorrect statements are (ii), (iii), and (iv).

Thus, the correct option is that only the first statement is true.