Question:
In oxygenic photosynthetic organism, photosynthetic pigment is located in __________
In oxygenic photosynthetic organism, photosynthetic pigment is located in __________
Show Hint
The light reactions (which require photosynthetic pigments to capture light) occur on the thylakoid membranes. The dark reactions (which fix carbon dioxide using the energy from the light reactions) occur in the fluid stroma.
Updated On: Aug 5, 2026
- Peroxisome
- Stroma
- Chlorosome
- Thylakoid membranes
Show Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
Oxygenic photosynthesis is performed by plants, algae, and cyanobacteria.
This process uses light energy to synthesize organic compounds from carbon dioxide and water, releasing oxygen as a byproduct.
This light absorption requires specialized pigments like chlorophylls and carotenoids.
Step 2: Detailed Explanation:
Let us locate the photosynthetic machinery within the plant cell:
- Oxygenic photosynthesis takes place inside the chloroplast.
- The chloroplast contains a fluid matrix called the stroma (where the light-independent reactions occur) and a membrane network called the thylakoids (where the light-dependent reactions occur).
- Photosynthetic pigments (like chlorophyll a, chlorophyll b, and carotenoids) are hydrophobic molecules that must be embedded in a lipid bilayer to remain stable and functional.
- These pigments are organized into pigment-protein complexes called photosystems (Photosystem I and II) located in the thylakoid membranes.
- This membrane localization is essential because it allows the energy absorbed by the pigments to drive an electron transport chain across the membrane, creating the proton gradient needed to synthesize ATP.
- Let us review the other options:
Peroxisome: Involved in photorespiration and lipid metabolism, not photosynthesis.
Stroma: The site of the dark reaction (Calvin cycle), containing soluble enzymes like Rubisco, but no pigments.
Chlorosome: A light-harvesting complex found in anoxygenic green sulfur bacteria, not in oxygenic photosynthetic organisms.
Step 3: Final Answer:
The correct option is (D).
Oxygenic photosynthesis is performed by plants, algae, and cyanobacteria.
This process uses light energy to synthesize organic compounds from carbon dioxide and water, releasing oxygen as a byproduct.
This light absorption requires specialized pigments like chlorophylls and carotenoids.
Step 2: Detailed Explanation:
Let us locate the photosynthetic machinery within the plant cell:
- Oxygenic photosynthesis takes place inside the chloroplast.
- The chloroplast contains a fluid matrix called the stroma (where the light-independent reactions occur) and a membrane network called the thylakoids (where the light-dependent reactions occur).
- Photosynthetic pigments (like chlorophyll a, chlorophyll b, and carotenoids) are hydrophobic molecules that must be embedded in a lipid bilayer to remain stable and functional.
- These pigments are organized into pigment-protein complexes called photosystems (Photosystem I and II) located in the thylakoid membranes.
- This membrane localization is essential because it allows the energy absorbed by the pigments to drive an electron transport chain across the membrane, creating the proton gradient needed to synthesize ATP.
- Let us review the other options:
Peroxisome: Involved in photorespiration and lipid metabolism, not photosynthesis.
Stroma: The site of the dark reaction (Calvin cycle), containing soluble enzymes like Rubisco, but no pigments.
Chlorosome: A light-harvesting complex found in anoxygenic green sulfur bacteria, not in oxygenic photosynthetic organisms.
Step 3: Final Answer:
The correct option is (D).
Was this answer helpful?
0
0
Top ICAR AIEEA Agronomy Questions
- The causal organism of downy mildew of grapevine is .
- Match Chemicals with their Use.
Chemical Used as (A) Thiophanate-methyl (I) Weedicide (B) Atrazine (II) Insecticide (C) Fenamiphos (III) Fungicide (D) Afidopyropen (IV) Nematicide
Choose the correct answer from the options given below: - Arrange the following spores of black rust fungi in their I to IV spore stages.
(A) Basidiospore
(B) Uredospore
(C) Aeciospore
(D) Teliospore
Choose the correct answer from the options given below: - Given below are two statements:
Statement (I): According to response of length of day and night on the flowering of plants, they are classified as long day or short day plants.
Statement (II): Wheat and oat are long day plants.
In light of the above statements, choose the most appropriate answer from the options given below. - Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A): A series of cellulolytic enzymes are employed in the wood degradation process by brown rot fungi.
Reason (R): Lignin is not degraded by these fungi, therefore, it has typical brown colour wood remains.
In light of the above statements, choose the most appropriate answer from the options given below.
View More Questions
Top ICAR AIEEA Plant Biochemistry Questions
- Rieske centre is
- The sap of a plant cell has an osmotic potential of -10 bars and there is a wall pressure of 2 bars, when this cell is placed with an osmotic potential of -3 bars, the force causing water to enter the cell is:
- ATP is produced in which of the following steps of ETS?
- Find out the correct equation from the following
- hy4 gene related to photomorphogensis was later named as
View More Questions
Top ICAR AIEEA Questions
- Which of the following statements is false?
- Which of the following is an example of an inventory?
- According to Adam Smith, productivity gains could be brought about through .
- The supply curve for an artificially scarce good is .
- Which of the following would not be considered an opportunity cost of paid employment?
View More Questions