Select odd one out with respect to physiological effects of plant growth regulator which is biosynthesised from tryptophan:

Options

A. Inhibits the growth of the axillary buds
B. Also induce parthenocapy in tomatoes
C. Leads to early seed reproduction in conifers
D. Widely used as herbicides

Answer

To solve the question of identifying the odd one out with respect to the physiological effects of the plant growth regulator that is biosynthesized from tryptophan, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Plant Growth Regulator**:
- The plant growth regulator that is biosynthesized from tryptophan is **Auxin**.

2. **Analyze the Options**:
- **Option 1**: "Inhibits the growth of the axillary buds."
- This is a known effect of Auxin. Auxin promotes apical dominance, which inhibits the growth of axillary buds.

- **Option 2**: "Induces Parthenocarpy in Tomato."
- Auxin is known to induce parthenocarpy, which is the development of fruit without fertilization.

- **Option 3**: "Leads to Early Seed Reproduction production in conifers."
- This effect is not associated with Auxin. Instead, it is related to **Gibberellins**, which promote seed germination and early seed production in various plants, including conifers.

- **Option 4**: "Widely used as a herbicide."
- Auxin is indeed widely used as a herbicide, with 2,4-D being a common example.

3. **Identify the Odd One Out**:
- From the analysis, **Option 3** is the odd one out because it describes a physiological effect (early seed reproduction in conifers) that is not associated with Auxin but rather with Gibberellins.

### Final Answer:
The odd one out is **Option 3: Leads to Early Seed Reproduction production in conifers**.

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