Canada balsam, a mounting agent used to make permanent slides, is obtained from the species of

Options

A. Abies
B. Cedrus
C. Pinus
D. Juniperus

Explanation

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks about the source of Canada balsam, which is a mounting agent used for making permanent slides.

2. **List the Options**: The options provided are:
- A. Abies
- B. Cedrus
- C. Pinus
- D. Juniperus

3. **Understand the Source**: Canada balsam is specifically derived from a type of tree known as balsam fir.

4. **Determine the Correct Species**: The balsam fir belongs to the genus **Abies**. Therefore, the correct answer is **Abies**.

5. **Explain the Process**: Canada balsam is obtained from balsam fir trees by extracting the resin. This resin is then mixed with essential oils, leading to the formation of a yellowish mounting agent. The evaporation of the oil results in an amorphous substance, which is essential for making permanent slides.

6. **Conclusion**: The species from which Canada balsam is obtained is **Abies**.

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