Which of the following is not found naturally in plants?

Options

A. NAA
B. IBA
C. Kinetin
D. Both (1) and (3)

Answer

To solve the question "Which of the following is not found naturally in plants?" we need to analyze each of the options provided:

### Step 1: Analyze Option 1 - NAA (Naphthalene Acetic Acid)
- NAA is a synthetic plant growth regulator that belongs to the auxin family.
- It is not naturally occurring in plants; it is artificially created for agricultural use.

**Hint:** Look for whether the substance is synthesized naturally in plants or created artificially.

### Step 2: Analyze Option 2 - IBA (Indole Butyric Acid)
- IBA is an auxin that is naturally produced in plants.
- It is commonly used in horticulture for rooting and plant growth.

**Hint:** Check if the substance is a naturally occurring hormone in plants.

### Step 3: Analyze Option 3 - Kinetin
- Kinetin is a type of cytokinin. Initially, it was considered a synthetic compound when it was first isolated.
- However, it has been proven to occur naturally in plants and is found in various plant tissues.

**Hint:** Consider the history of the compound and whether it has been proven to exist in nature.

### Step 4: Conclusion
- From the analysis, we can conclude that NAA (Naphthalene Acetic Acid) is the only option that is not found naturally in plants.
- Therefore, the correct answer to the question is **Option 1: NAA**.

### Final Answer:
**NAA (Naphthalene Acetic Acid) is not found naturally in plants.**