Apical and axillary meristem are free of virus due to (i) concentration of (ii) and rapid rate of cell division. Select the correct option to an in the blanks (i and (ii).

Options

A. (i) Low, (ii) Cytokinins
B. (i) Low, (ii) Gibberellins
C. (i) High, (ii) Auxins
D. (i) High, (ii) Abscisic acid

Answer

To solve the question regarding why apical and axillary meristems are free of viruses, we need to fill in the blanks (i) and (ii) with the correct terms based on the context provided.

**Step 1: Understanding the context**
- The question states that apical and axillary meristems are free of viruses due to two reasons: the concentration of a certain substance (i) and a rapid rate of cell division (ii).

**Step 2: Identifying the factors involved**
- The rapid rate of cell division in meristems is primarily influenced by plant hormones. The two key hormones that promote cell division are cytokinins and auxins.

**Step 3: Analyzing the options**
- The options provided are:
1. Low and cytokinins
2. Low and gibberellins
3. High and auxins
4. High and abscisic acid

**Step 4: Evaluating the options**
- **Low and cytokinins**: Incorrect, as low concentration would not promote rapid cell division.
- **Low and gibberellins**: Incorrect, gibberellins are not primarily responsible for cell division.
- **High and auxins**: Correct, as high concentration of auxins promotes rapid cell division.
- **High and abscisic acid**: Incorrect, as abscisic acid inhibits cell division.

**Step 5: Filling in the blanks**
- Therefore, the correct answers to fill in the blanks are:
(i) "high" and (ii) "auxins".

**Final Answer:**
Apical and axillary meristem are free of virus due to (i) high concentration of (ii) auxins and rapid rate of cell division.

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