Match the columns and choose the correct combination :
`{:(," I",," II"),((a),"Cytokinin",(p),"Stress hormone"),((b),"Auxins",(q),"Ripening of fruits"),((c),"Abscisic acid",(r),"Apical dominance"),((d),"Ethylene",(s),"Bolting"),(,,(t),"Richmond-Lang Effect"):}`

Options

A. a-t, b-r, c-p, d-q
B. a-t, b-r, c-p, d-s
C. a-r, b-s, c-q, d-p
D. a-q, b-s, c-t, d-r

Answer

To solve the problem of matching the columns with the correct combinations of plant hormones and their functions, we will analyze each hormone and its corresponding function step-by-step.

### Step-by-Step Solution:

1. **Identify the Functions of Each Hormone:**
- **Cytokinin (I - a)**: This hormone is known for delaying senescence (aging) in plants and is associated with the Richmond-Lang effect.
- **Auxins (I - b)**: Auxins are primarily responsible for apical dominance, which is the phenomenon where the main central stem grows more strongly than the side stems.
- **Abscisic Acid (I - c)**: This hormone acts as a stress hormone, particularly in response to drought conditions, and it helps in closing the stomata.
- **Ethylene (I - d)**: Ethylene is a gaseous hormone that plays a crucial role in the ripening of fruits.

2. **Match Each Hormone with its Function:**
- **Cytokinin (a)** matches with **Richmond-Lang Effect (t)**.
- **Auxins (b)** matches with **Apical Dominance (r)**.
- **Abscisic Acid (c)** matches with **Stress Hormone (p)**.
- **Ethylene (d)** matches with **Ripening of Fruits (q)**.

3. **Final Combinations:**
- (a) Cytokinin - (t) Richmond-Lang Effect
- (b) Auxins - (r) Apical Dominance
- (c) Abscisic Acid - (p) Stress Hormone
- (d) Ethylene - (q) Ripening of Fruits

### Correct Combination:
The correct matches are:
- a - t
- b - r
- c - p
- d - q