The Question is from neet-botany photosynthesis-in-higher-plants introduction, and it was created by the author Mr. NARESH KUMAR K

Question

Factors affecting photosynthesis are
I. number and size of leaves
II. age and orientation of leaves
III. amount of chlorophyll
IV. amount of ${O_2}$ and $C{O_2}$
Select the correct option

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: D
## CONCEPT FRAMEWORK
**Primary Concept**: Factors affecting photosynthesis
**Related Topics**:  Light-dependent and light-independent reactions, plant physiology
**Prerequisites**: Basic understanding of photosynthesis
## SOLUTION PATHWAY
**Given Information**:
    List of factors potentially affecting photosynthesis: number and size of leaves, age and orientation of leaves, amount of chlorophyll, amount of O2 and CO2.
**Method & Steps**:
1. **Evaluate each factor:** Consider how each listed factor impacts the rate of photosynthesis.
    Reasoning: Photosynthesis requires light absorption, CO2 uptake, and chlorophyll for energy conversion.
2. **Number and size of leaves (I):** More leaves, or larger leaves, generally provide more surface area for light absorption, increasing photosynthesis.
    Key Point: Leaf surface area is directly related to the amount of light captured.
3. **Age and orientation of leaves (II):** Younger leaves often have higher photosynthetic rates. Orientation affects light exposure. 
    Key Point: Leaf age and angle relative to light source matter.
4. **Amount of chlorophyll (III):** Chlorophyll is the pigment that absorbs light energy. More chlorophyll means more light can be absorbed and used for photosynthesis.
    Key Point: Chlorophyll is essential for light absorption.
5. **Amount of O2 and CO2 (IV):** CO2 is a reactant, while O2 is a product. The concentration of CO2 directly affects the rate of photosynthesis. While high concentrations of O2 can inhibit photosynthesis under some conditions, it's a crucial part of the process as a byproduct, and the availability of O2 is not a limiting factor, making this part of the answer correct.
    Key Point: CO2 is a key reactant.
6. **Conclusion:** All four factors listed affect the rate of photosynthesis.
    Result: All options are correct
## OPTION ANALYSIS
[A] :x: Incorrect because it omits chlorophyll content (III).
[B] :x: Incorrect because it contains a non-existent 'V' and omits relevant factors.
[C] :x: Incorrect because it contains a non-existent 'V' and omits relevant factors.
[D] ✓: Correct because it includes all the correct factors: number and size of leaves, age and orientation of leaves, amount of chlorophyll, and amount of O2 and CO2.
## LEARNING AIDS
**Common Mistakes**:
1. **Ignoring leaf age:** Forgetting that younger leaves are generally more efficient.
    How to avoid: Remember that age can impact the physiological state of a leaf.
2. **Not including chlorophyll:** Failing to recognize the importance of chlorophyll as the light-absorbing pigment.
    How to avoid: Remember that chlorophyll is essential for photosynthesis.
**Quick Tips**:
1. **Think of a plant's resources:** Consider what a plant needs to carry out photosynthesis: light, chlorophyll, CO2, and surface area.
2. **Relate to plant structure:** Understand how leaf structure and arrangement are related to photosynthesis.

Mr. NARESH KUMAR K · Answer

I, II and IV

Mr. NARESH KUMAR K · Answer

II, IV and V

Mr. NARESH KUMAR K · Answer

IV, V and I

Mr. NARESH KUMAR K · Answer

The correct Option is "I, II, III and IV"

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