Assertion (A): Photosynthesis and vision are the phenomenon of visible light.
Reason (R): The visible light is absorbed by small particles containing chlorophylls, as well as the retina of the eye.

Options

A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true but R is not the correct explanation of A.
C. A is true but R is false.
D. Both A and R are false.

Answer

To analyze the assertion and reason provided in the question, we will break down the statements and evaluate their truthfulness step by step.

### Step 1: Understanding the Assertion
The assertion states: "Photosynthesis and vision are the phenomena of visible light."
- Photosynthesis is the process by which green plants use sunlight to synthesize foods with the help of chlorophyll.
- Vision refers to the ability to see, which is dependent on light entering the eye and being processed by the retina.

**Conclusion for Step 1**: Both photosynthesis and vision indeed rely on visible light. Thus, the assertion is **true**.

### Step 2: Understanding the Reason
The reason states: "The visible light is absorbed by small particles containing chlorophylls, as well as the retina of the eye."
- Chlorophyll is a green pigment found in plants that absorbs sunlight, particularly in the blue and red wavelengths, which is essential for photosynthesis.
- The retina is a light-sensitive layer at the back of the eye that contains photoreceptor cells (rods and cones) which absorb visible light to enable vision.

**Conclusion for Step 2**: The statement accurately describes how chlorophyll absorbs light for photosynthesis and how the retina absorbs light for vision. Thus, the reason is also **true**.

### Step 3: Evaluating the Relationship
Now we need to determine if the reason correctly explains the assertion.
- The assertion is about the phenomena of photosynthesis and vision being related to visible light.
- The reason provides a mechanism (absorption of visible light by chlorophyll and the retina) that supports the assertion.

**Conclusion for Step 3**: Since the reason explains how both photosynthesis and vision occur through the absorption of visible light, it is appropriate to say that the reason supports the assertion.

### Final Conclusion
Both the assertion and the reason are true, and the reason correctly explains the assertion.

### Summary of Solution:
- Assertion (A) is true: Photosynthesis and vision are phenomena of visible light.
- Reason (R) is true: Visible light is absorbed by chlorophyll in plants and by the retina in the eye.
- The reason supports the assertion.