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 Definitions**:
- A **pure tall plant** has two dominant alleles (TT).
- A **hybrid tall plant** has one dominant allele and one recessive allele (Tt).

2. **Perform a Self-Pollination Test**:
- Self-pollinate the pure tall plant (TT).
- Self-pollinate the hybrid tall plant (Tt).

3. **Analyze the Offspring**:
- For the pure tall plant (TT):
- When self-pollinated (TT x TT), all offspring will be tall (100% TT).
- For the hybrid tall plant (Tt):
- When self-pollinated (Tt x Tt), the offspring will be:
- 25% TT (tall)
- 50% Tt (tall)
- 25% tt (dwarf)
- This results in a mix of tall and dwarf plants.

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

### Final Answer:
A pure tall plant can be differentiated from a hybrid tall plant by observing the results of self-pollination. If all offspring are tall, the plant is pure tall (TT). If there are both tall and dwarf offspring, the plant is a hybrid tall (Tt).

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