A pure tall plant can be differentiated from a hybrid tall plant :

Options

A. By measuring length of plant
B. By spraying gibberalins
C. If all plants are tall after self-pollination
D. If all plants are dwarf after self-pollination

Answer

To differentiate a pure tall plant from a hybrid tall plant, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Genotypes**:
- A pure tall plant has the genotype **TT** (homozygous dominant).
- A hybrid tall plant has the genotype **Tt** (heterozygous).

2. **Self-Pollination**:
- To determine the genotype of the tall plant, we can perform self-pollination. This involves allowing the plant to fertilize itself.

3. **Analyze the Offspring**:
- After self-pollination, observe the offspring plants:
- If the plant is pure tall (TT), all offspring will also be tall (100% tall).
- If the plant is hybrid tall (Tt), the offspring will be a mix of tall and short plants (approximately 50% tall and 50% short).

4. **Conclusion**:
- If all offspring from the self-pollination are tall, we can conclude that the original plant is a pure tall plant (TT).
- If there are both tall and short offspring, the original plant is a hybrid tall plant (Tt).

### Final Answer:
The correct method to differentiate a pure tall plant from a hybrid tall plant is to perform self-pollination. If all offspring are tall, the plant is pure tall (TT). If there are both tall and short offspring, the plant is hybrid tall (Tt).