The extractives of heart wood are

Options

A. Gums, resins and tannins
B. Presence of sap
C. The primary metabolites
D. Starch and latex

Answer

### Step-by-Step Solution

1. **Understanding Heartwood**:
- Heartwood is the central, supporting pillar of a tree, which is typically darker than the outer layers. It is formed from the accumulation of secondary xylem and is known for its durability and resistance to decay.

2. **Composition of Heartwood**:
- Heartwood contains various organic compounds that contribute to its strength and resistance against pests and diseases. These compounds are referred to as extractives.

3. **Identifying Extractives**:
- The main extractives found in heartwood include:
- **Tannins**: These are polyphenolic compounds that provide astringency and help in protecting the wood from microbial attack.
- **Resins**: These are sticky substances that can help seal wounds and protect the wood from insects and fungi.
- **Oils**: These can provide additional protection and contribute to the wood's aromatic properties.
- **Gums**: These are viscous substances that can also play a role in sealing and protecting the wood.
- **Aromatic Substances**: These compounds can contribute to the characteristic smell of certain types of wood.

4. **Evaluating the Options**:
- The question provides several options regarding the extractives of heartwood.
- The correct option should include the compounds mentioned above.

5. **Selecting the Correct Answer**:
- Upon reviewing the options, the first option which lists **Gum, Resins, Tannins** correctly identifies some of the primary extractives found in heartwood.
- Other options that mention sap, primary metabolites, starch, and latex do not accurately reflect the composition of heartwood.

6. **Conclusion**:
- Therefore, the extractives of heartwood are **Gums, Resins, and Tannins**.