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

Question

Where do the light-dependent reactions take place?

K SURESH KUMAR · Accepted Answer

## CORE INFORMATION
✓ **Answer**: A
## CONCEPT FRAMEWORK
	**Primary Concept**: Photosynthesis
	**Related Topics**: Light-dependent reactions, thylakoids, stroma, chloroplasts
	**Prerequisites**: Basic understanding of cellular organelles and photosynthesis.
## SOLUTION PATHWAY
**Given Information**:
	The question asks about the location of the light-dependent reactions in photosynthesis.
	No specific data is given, this is a knowledge-based question.
**Method & Steps**:
	1. Recall the structure of a chloroplast.
		Reasoning: Chloroplasts are the organelles responsible for photosynthesis. They have internal membrane structures.
		Formula/Rule: N/A
	2. Identify the specific location of the light-dependent reactions within the chloroplast.
		Working: The light-dependent reactions require chlorophyll and other pigments embedded in membranes to capture light energy.  These membranes are the thylakoid membranes.
		Key Point: The thylakoid membranes form stacks called grana, maximizing surface area for light absorption.
	3. Select the correct option.
		Result: The light-dependent reactions take place in the thylakoid membranes.
		Verification: This aligns with the established understanding of photosynthesis and chloroplast structure.
## OPTION ANALYSIS
A ✓: Thylakoid membranes are the site of the light-dependent reactions because they contain chlorophyll and the electron transport chain necessary for these reactions. 
B :x: The stroma is the fluid-filled space surrounding the thylakoids; it's the location of the light-independent reactions (Calvin cycle).
C :x: Mitochondria are the sites of cellular respiration, not photosynthesis.
D :x: The cytoplasm is the fluid inside the cell; it's not directly involved in photosynthesis.
## LEARNING AIDS
	**Common Mistakes**:
		1. Confusing the light-dependent and light-independent reactions and their locations: Remember that the light-dependent reactions occur in the thylakoid membranes, while the light-independent reactions (Calvin cycle) occur in the stroma.
		2. Incorrectly associating photosynthesis with mitochondria: Photosynthesis occurs in chloroplasts, while cellular respiration occurs in mitochondria.
	**Quick Tips**:
		1. Visualize a chloroplast's structure:  Imagine stacked pancakes (grana) within a larger structure. The ‘pancakes’ are the thylakoid membranes.
		2. Associate ‘light’ with ‘membrane’: The light-dependent reactions need a large surface area for light absorption, hence the thylakoid membranes.

K SURESH KUMAR · Answer

The correct Option is "Thylakoid membranes"

K SURESH KUMAR · Answer

Stroma

K SURESH KUMAR · Answer

Mitochondria

K SURESH KUMAR · Answer

Cytoplasm

NEET Botany Photosynthesis in Higher Plants MCQs

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