Physiological function of the phytohormone , that is synthesized from acetly co - enzyme A molecules is

Options

A. Promotion of seed germination
B. Promotion of apical dominance
C. Removal of apical dominance
D. Promotion of triple response growth

Answer

### Step-by-Step Solution

1. **Identify the Phytohormone**: The question asks for the physiological function of a phytohormone synthesized from acetyl coenzyme A. The phytohormone in question is Abscisic Acid (ABA).

2. **Understand the Synthesis**: Abscisic Acid is synthesized from acetyl coenzyme A, which is a key precursor in its biosynthetic pathway. This is important as it links the hormone to its biochemical origin.

3. **Explore the Functions of Abscisic Acid**: Abscisic Acid is known for several physiological functions in plants. One of its primary roles is to inhibit seed germination. This function is crucial for ensuring that seeds do not germinate under unfavorable conditions.

4. **Evaluate the Options**: The question provides multiple-choice options regarding the functions of Abscisic Acid:
- **Option 1**: Promotion of seed germination (Incorrect, ABA inhibits seed germination).
- **Option 2**: Promotion of apical dominance (Incorrect, this is primarily regulated by auxins).
- **Option 3**: Removal of apical dominance (Incorrect, also regulated by auxins).
- **Option 4**: Promotion of triple response growth (Incorrect, this is caused by ethylene).

5. **Select the Correct Answer**: Based on the evaluation, the correct physiological function of Abscisic Acid is the inhibition of seed germination. Therefore, the answer is that Abscisic Acid (ABA) inhibits seed germination.

### Final Answer
The physiological function of the phytohormone synthesized from acetyl coenzyme A (Abscisic Acid) is the inhibition of seed germination.

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