The Question is from neet-botany respiration-in-plants do-plants-breath, and it was created by the author K SURESH KUMAR

Question

A researcher observes that a plant placed in a sealed chamber shows a net decrease in CO2 levels during the day but a net increase at night. What can be inferred about the metabolic processes occurring?

K SURESH KUMAR · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
 **Primary Concept**: Photosynthesis and Respiration in Plants
 **Related Topics**: Plant metabolism, gas exchange, carbon dioxide cycle
 **Prerequisites**: Understanding of photosynthesis and respiration as processes involving CO2 uptake and release.
## SOLUTION PATHWAY
**Given Information**:
  Net decrease in CO2 during the day.
  Net increase in CO2 at night.
**Method & Steps**:
 1. Analyze the daily CO2 change:
  Reasoning: During the day, the decrease in CO2 indicates that a process consuming CO2 is dominant. This process is photosynthesis.
  Formula/Rule: Photosynthesis: $6CO_2 + 6H_2O + Light ightarrow C_6H_{12}O_6 + 6O_2$
 2. Analyze the nightly CO2 change:
  Working:  At night, the increase in CO2 indicates that a process releasing CO2 is dominant. This process is respiration.
  Formula/Rule: Respiration: $C_6H_{12}O_6 + 6O_2 ightarrow 6CO_2 + 6H_2O + Energy$
 3. Integrate day and night observations:
  Result: The plant undergoes both photosynthesis and respiration. During the day, photosynthesis (CO2 consumption) exceeds respiration (CO2 production), leading to a net decrease in CO2. At night, only respiration occurs, resulting in a net increase in CO2.
  Verification: The observation aligns perfectly with the known metabolic activities of plants.
 ## OPTION ANALYSIS
A :x: Incorrect.  If the plant was only respiring, CO2 levels would increase both day and night.
B :x: Incorrect. If the plant was only photosynthesizing, CO2 levels would decrease both day and night.
C ✓: Correct. This option accurately describes the observed changes in CO2 levels, reflecting the dominance of photosynthesis during the day and respiration at night.
D :x: Incorrect. This option suggests that respiration dominates during the day, which contradicts the observation of decreasing CO2 levels during the day.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing photosynthesis and respiration: Remember photosynthesis consumes CO2 and produces O2, while respiration consumes O2 and produces CO2.
  2.Ignoring the time of day:  Metabolic processes in plants vary significantly between day and night due to light availability.
 **Quick Tips**:
  1.Relate CO2 changes to the dominant metabolic process (photosynthesis consumes CO2, respiration releases CO2).
  2.Remember that plants perform both photosynthesis and respiration, but the rates of these processes differ depending on light availability.

K SURESH KUMAR · Answer

The plant is only respiring, both day and night.

K SURESH KUMAR · Answer

The plant is only photosynthesizing, both day and night.

K SURESH KUMAR · Answer

The correct Option is "Photosynthesis exceeds respiration during the day, while respiration exceeds photosynthesis at night."

K SURESH KUMAR · Answer

Respiration exceeds photosynthesis during the day, while photosynthesis exceeds respiration at night.

NEET Botany Respiration in Plants Do Plants Breath MCQs

Select Topic

Question Tags

Question Tags

NEET Subjects

Our Bots

Company