Match the columus and choose the correct combination
`{:("Growth Regulator"," Action"),("(a) Abscisic aicd","(1) Delays leaf abscission"),("(b) Ethylene","(2) Inhibits seed "),(," germination"),("(c) Cytokinin","(3) Herbicide"),("(d) Auxin","(4) Hastens fruit ripening"):}`

Options

A. a-2, b-4, c-1, d-3
B. a-1, b-2, c-3, d-4
C. a-2, b-3, c-4, d-1
D. a-2, b-1, c-3, d-4

Answer

To solve the question of matching the growth regulators with their corresponding actions, we will analyze each growth regulator and its known effects.

### Step-by-Step Solution:

1. **Identify the Growth Regulators:**
- (a) Abscisic acid
- (b) Ethylene
- (c) Cytokinin
- (d) Auxin

2. **Analyze the Actions:**
- (1) Delays leaf abscission
- (2) Inhibits seed germination
- (3) Herbicide
- (4) Hastens fruit ripening

3. **Match Each Growth Regulator with Its Action:**
- **Abscisic acid (a):** This hormone is known as the stress hormone and it inhibits seed germination under unfavorable conditions. Therefore, it matches with (2) Inhibits seed germination.
- **Ethylene (b):** Ethylene is known as the ripening hormone, which hastens fruit ripening. Thus, it matches with (4) Hastens fruit ripening.
- **Cytokinin (c):** Cytokinins are known to promote cell division and delay leaf abscission. Therefore, it matches with (1) Delays leaf abscission.
- **Auxin (d):** Auxins, particularly synthetic ones like 2,4-D, are used as herbicides. Hence, it matches with (3) Herbicide.

4. **Final Matching:**
- A → 2 (Abscisic acid → Inhibits seed germination)
- B → 4 (Ethylene → Hastens fruit ripening)
- C → 1 (Cytokinin → Delays leaf abscission)
- D → 3 (Auxin → Herbicide)

### Correct Combination:
- (a) Abscisic acid → (2) Inhibits seed germination
- (b) Ethylene → (4) Hastens fruit ripening
- (c) Cytokinin → (1) Delays leaf abscission
- (d) Auxin → (3) Herbicide