Identify the correct match regard to Photosynthesis experiments
List-I
A) Variegated leaf experiment
B) Half-leaf experiment
C) Light screen experiment (Leaf that was covered partially with black paper)
D) Engelmann's experiment
List = II
I) Action spectrum
II) Synthesis of starch
III) Chlorophyll is necessary
IV) Light is necessary
V) `CO_2` is necessary

Options

A. A - V , B -I , C - II , D - IV
B. A - III , B - V , C - IV , D - I
C. A - IV , B -III , C - I , D - V
D. A - III , B -V , C - IV , D - II

Answer

To solve the question of matching the experiments related to photosynthesis with their corresponding outcomes, we will analyze each experiment in List-I and find the correct match from List-II.

### Step-by-Step Solution:

1. **Variegated Leaf Experiment (A)**:
- This experiment demonstrates the necessity of chlorophyll for photosynthesis. Variegated leaves have both green (chlorophyll-containing) and non-green (no chlorophyll) areas. When tested for starch production, only the green areas will produce starch, indicating that chlorophyll is essential for photosynthesis.
- **Match**: A → III (Chlorophyll is necessary)

2. **Half-Leaf Experiment (B)**:
- Also known as Mall's half-leaf experiment, this experiment shows that carbon dioxide (CO2) is necessary for photosynthesis. In this experiment, one half of a leaf is exposed to CO2 while the other half is not. Only the half exposed to CO2 will produce starch, indicating the necessity of CO2.
- **Match**: B → V (CO2 is necessary)

3. **Light Screen Experiment (C)**:
- In this experiment, a leaf is partially covered with black paper to block light. The uncovered part of the leaf will perform photosynthesis, while the covered part will not. This demonstrates that light is essential for photosynthesis.
- **Match**: C → IV (Light is necessary)

4. **Engelmann's Experiment (D)**:
- Engelmann's experiment involves using a prism to split light into different wavelengths and observing the oxygen production by algae. This experiment demonstrates the action spectrum of photosynthesis, showing which wavelengths are most effective for photosynthesis.
- **Match**: D → I (Action spectrum)

### Summary of Matches:
- A → III (Chlorophyll is necessary)
- B → V (CO2 is necessary)
- C → IV (Light is necessary)
- D → I (Action spectrum)

### Final Matching:
Based on the above analysis, the correct matches are:
- A - III
- B - V
- C - IV
- D - I

The correct option that lists these matches is **Option 2**.