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When the intensity of light falling on l...

When the intensity of light falling on leaf increases beyond a point, chlorphyll is destroyed. This phenomenon occurs in the presence of

A

`CO_(2)` and is called photooxidatin

B

`O_(2)` and is called photooxidation

C

`O_(2)` and is called photorespiration

D

`CO_(2)` and is called photorespiration

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the phenomenon that occurs when the intensity of light falling on a leaf increases beyond a point, leading to the destruction of chlorophyll, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding Chlorophyll's Role**: - Chlorophyll is a pigment essential for photosynthesis, allowing plants to absorb light energy. 2. **Identifying the Effect of High Light Intensity**: - When the intensity of light exceeds a certain threshold, it can lead to damage in the chlorophyll molecules. 3. **Defining the Phenomenon**: - This damage to chlorophyll due to excessive light intensity is known as **photo-oxidation**. 4. **Conditions for Photo-Oxidation**: - Photo-oxidation occurs in the presence of oxygen (O2). This process involves the oxidation of chlorophyll when it absorbs too much light energy. 5. **Reactive Oxygen Species (ROS)**: - During photo-oxidation, reactive oxygen species (ROS) can form, which are harmful to the plant cells and can lead to further damage. 6. **Conclusion**: - Therefore, the phenomenon where chlorophyll is destroyed due to high light intensity is called **photo-oxidation**, and it occurs in the presence of **oxygen**. ### Final Answer: The phenomenon is called **photo-oxidation**, and it occurs in the presence of **oxygen (O2)**. ---
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