Match the columns `{:(, "Column I",,"Column II"),(a,"Girdling","p","Ascent of sap"),(b,"Cobalt chloride paper method","q","Transpiration"),(c,"Atmometer","r","Unequal transpiration on two surfaces"),(d,"Ball jar experimeant","s","Translocation in phloem") :}`

Options

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

Answer

To solve the matching question between Column I and Column II, we will analyze each item in Column I and find its corresponding match in Column II based on their definitions and functions.

### Step-by-Step Solution:

1. **Girdling (a)**:
- Girdling is a process where the outer bark (phloem) of a woody stem is removed. This process demonstrates that phloem is responsible for the translocation of food in plants.
- **Match**: Girdling (a) corresponds to **Translocation in phloem (s)**.

2. **Cobalt Chloride Paper Method (b)**:
- The cobalt chloride paper method involves using a paper that changes color when it comes into contact with water. This method is used to demonstrate unequal transpiration on the upper and lower surfaces of leaves, as the lower surface has more stomata.
- **Match**: Cobalt chloride paper method (b) corresponds to **Unequal transpiration on two surfaces (r)**.

3. **Atmometer (c)**:
- An atmometer, also known as an evaporimeter, measures the rate of water evaporation from a surface. This is closely related to the ascent of sap, as transpiration (evaporation of water) facilitates the upward movement of water in plants.
- **Match**: Atmometer (c) corresponds to **Ascent of sap (p)**.

4. **Ball Jar Experiment (d)**:
- The ball jar experiment (or bell jar experiment) is used to demonstrate that transpiration occurs even when a plant is covered. Water droplets appear on the inside of the jar, indicating that transpiration is happening.
- **Match**: Ball jar experiment (d) corresponds to **Transpiration (q)**.

### Final Matches:
- A (Girdling) → S (Translocation in phloem)
- B (Cobalt chloride paper method) → R (Unequal transpiration on two surfaces)
- C (Atmometer) → P (Ascent of sap)
- D (Ball jar experiment) → Q (Transpiration)

Thus, the correct matches are:
- A → S
- B → R
- C → P
- D → Q

### Conclusion:
The correct answer is option 2, which states:
- A is with S
- B is with R
- C is with P
- D is with Q