The Question is from neet-botany photosynthesis-in-higher-plants , and it was created by the author B VENKAT

Question

Increasing the concentration of carbon dioxide around a plant will MOST likely increase the rate of photosynthesis up to a certain point, because:

B VENKAT · Accepted Answer

## CORE INFORMATION
✓ **Answer**: A
## CONCEPT FRAMEWORK
 **Primary Concept**: Photosynthesis and its limiting factors
 **Related Topics**:  Carbon dioxide concentration, enzyme kinetics, light-dependent reactions, light-independent reactions (Calvin cycle)
 **Prerequisites**: Basic understanding of photosynthesis equation and the role of reactants and products.
## SOLUTION PATHWAY
**Given Information**:
  Increased CO2 concentration around a plant.
  Photosynthesis rate increases up to a certain point.
**Method & Steps**:
 1. Understand the photosynthesis equation.
  Reasoning: Photosynthesis converts light energy into chemical energy in the form of glucose.  The overall equation is:
  Formula/Rule: $6CO_2 + 6H_2O + Light Energy ightarrow C_6H_{12}O_6 + 6O_2$
 2. Identify the role of CO2.
  Working:  From the equation, CO2 is a reactant, meaning it is consumed during the process.  Increasing the concentration of a reactant generally speeds up a reaction until another factor becomes limiting (e.g., light intensity, water availability).
  Key Point:  The reaction rate depends on the availability of reactants.  At some point, increasing CO2 further won't increase the rate because other factors become limiting.
 3. Analyze the options.
  Result: Option A correctly identifies CO2 as a reactant in photosynthesis.  Therefore, increasing its concentration increases the rate of reaction up to a point where other factors become limiting.
  Verification: The explanation aligns with the basic principles of chemical kinetics and the understanding of photosynthesis.
 ## OPTION ANALYSIS
A ✓: CO2 is a reactant in photosynthesis. Increasing the concentration of a reactant generally increases the rate of a reaction until another factor becomes limiting. This is correct.
B :x: CO2 is a *product* of respiration, not photosynthesis. It is a reactant in photosynthesis. 
C :x: CO2 itself does not absorb light energy; chlorophyll absorbs light energy which is then used in photosynthesis.
D :x: CO2 does indirectly influence stomatal opening and closing (through its effect on water potential), but this is not the primary reason for the increased rate of photosynthesis.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing CO2 as a product instead of a reactant:  Remembering the photosynthesis equation helps avoid this mistake.
  2. Focusing on other factors before the role of the reactant:  Understanding the basic principles of chemical reactions is crucial.
 **Quick Tips**:
  1. Remember the photosynthesis equation: $6CO_2 + 6H_2O + Light Energy ightarrow C_6H_{12}O_6 + 6O_2$
  2. Reactants are consumed during a reaction; products are formed.

B VENKAT · Answer

The correct Option is "CO2 is a reactant in photosynthesis."

B VENKAT · Answer

CO2 is a product of photosynthesis.

B VENKAT · Answer

CO2 absorbs light energy.

B VENKAT · Answer

CO2 regulates the opening and closing of stomata.

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