Bones have a ________ and ____________ ground substance, rich in ________ salts and _____ fibres -

Options

A. Soft, pliable, Ca, collagen
B. Hard, pliable, Ca, collagen
C. Hard, non-pliable, Ca, collagen
D. Hard, pliable, Fe, collagen

Answer

To fill in the blanks in the statement "Bones have a ________ and ____________ ground substance, rich in ________ salts and _____ fibres," we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Components of Bone**:
- Bones are a type of skeletal connective tissue.
- They consist of a cellular component and a matrix (ground substance).

2. **Understand the Ground Substance**:
- The ground substance in bones is not soft; it is hard due to the presence of minerals.
- The hardness of bones is primarily due to the deposition of inorganic salts.

3. **Determine the Type of Ground Substance**:
- The ground substance in bones is described as "hard" because of the mineral content.
- It is also "non-pliable" or rigid, indicating that it does not bend easily.

4. **Identify the Rich Salts**:
- The primary inorganic salts found in bones are Calcium Phosphate and Calcium Carbonate.
- These salts contribute to the hardness and strength of the bone.

5. **Identify the Fibres Present**:
- The main type of fibres found in bone are collagen fibres.
- Collagen provides tensile strength to the bone, complementing the hardness provided by the mineral content.

### Final Answer:
Bones have a **hard** and **non-pliable** ground substance, rich in **calcium** salts and **collagen** fibres.

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