Hormone similar to animal steroidal hormone is

Options

A. auxin
B. gibberellin
C. ethylene
D. Cytokinin

Explanation

To solve the question "Hormone similar to animal steroidal hormone is," we will analyze the options provided and identify which hormone shares similarities with animal steroidal hormones.

### Step-by-Step Solution:

1. **Understand the Question**: We need to identify which plant hormone is similar to animal steroidal hormones. Steroidal hormones in animals are derived from cholesterol and have a specific structure.

2. **Analyze Each Option**:
- **Option 1: Auxin**: Auxins are primarily derived from the amino acid tryptophan. They do not have a steroidal structure.
- **Option 2: Gibberellin**: Gibberellins are derived from isoprene units. They have a structure that can be similar to steroid hormones, as they are based on a terpenoid structure.
- **Option 3: Ethylene**: Ethylene is a gaseous hormone derived from the amino acid methionine. It does not resemble steroid hormones.
- **Option 4: Cytokinin**: Cytokinins are derivatives of adenine, a nucleotide. They do not have a steroidal structure.

3. **Identify the Correct Answer**: Among the options, gibberellin is the only hormone that has a structure somewhat similar to steroid hormones due to its isoprene unit composition.

4. **Conclusion**: Therefore, the hormone that is similar to animal steroidal hormones is **gibberellin**.

### Final Answer:
The hormone similar to animal steroidal hormone is **gibberellin**.

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