H-zone of striated muscle fibre represents both thick and thin filaments.

Answer

**Step-by-Step Solution:**

1. **Understanding the Structure of Striated Muscle Fiber:**
- Striated muscle fibers are composed of repeating units called sarcomeres, which are the basic functional units of muscle contraction.

2. **Identifying the A Band and H Zone:**
- Within a sarcomere, there are different bands. The A band is the dark band that contains both thick (myosin) and thin (actin) filaments.
- The H zone is located in the center of the A band.

3. **Characteristics of the H Zone:**
- The H zone appears as a lighter band within the A band.
- It is important to note that the H zone specifically contains only thick filaments (myosin) and does not include any thin filaments (actin).

4. **Conclusion about the Statement:**
- The statement in the question claims that the H zone represents both thick and thin filaments. This is incorrect.
- Therefore, the statement is false because the H zone only contains thick filaments.

**Final Answer:**
The H-zone of striated muscle fiber represents only thick filaments and not both thick and thin filaments. Thus, the statement is false.

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