NEET Biology Photosynthesis in Higher Plants MCQs Set 19

Biology Objective Questions and Answers: Photosynthesis In Higher Plants

Access targeted multiple-choice questions for Photosynthesis In Higher Plants designed to align with the latest NEET academic syllabus for NEET Biology. These objective practice sets help students evaluate their conceptual understanding and improve exam readiness.

Download Photosynthesis In Higher Plants MCQs with Answers

View or download the dedicated Photosynthesis In Higher Plants MCQ resource below. Practicing these 50 objective questions regularly builds familiarity with standard exam patterns and helps secure higher marks in final Biology evaluations.

Multiple Choice Questions

Question 1: The formula of chlorophyll a is
(a) C35H72O5N4Mg
(b) C55H70O3N4Mg
(c) C55H72O5N4Mg
(d) C51H70O6N4Mg
Show Answer & Explanation

Answer: (c) C55H72O5N4Mg

Explanation:
1. Chlorophyll a is C55H72O5N4Mg.
2. Chlorophyll b has one oxygen more and two hydrogen fewer: C55H70O6N4Mg.

Teacher's Note:
1. Chlorophyll a has a methyl group (-CH3) and chlorophyll b has an aldehyde group (-CHO).

Question 2: The number of pigment molecules in a quantasome is
(a) 250 to 400
(b) 300 to 900
(c) 500 to 600
(d) 50 to 100
Show Answer & Explanation

Answer: (a) 250 to 400

Explanation:
1. Each quantasome, the photosynthetic unit, contains about 250 to 400 pigment molecules.
2. It includes the antenna molecules and a reaction centre.

Teacher's Note:
1. Quantasomes are the particles seen on the thylakoid membrane.

Question 3: The main difference between chlorophyll a and b is that
(a) Chlorophyll a is a linear chain compound and b is branched
(b) Chlorophyll a has no Mg2+ in the centre of the molecule
(c) In chlorophyll a there is a -CH3 group, whereas in b it is a -CHO group
(d) All of the above
Show Answer & Explanation

Answer: (c) In chlorophyll a there is a -CH3 group, whereas in b it is a -CHO group

Explanation:
1. Chlorophyll a has a methyl group at the third carbon of the porphyrin ring, and chlorophyll b has an aldehyde group.
2. Both have Mg at the centre and both have a ring head and phytol tail.

Teacher's Note:
1. This small change gives b a different absorption spectrum.

Question 4: Chlorophyll a is found in
(a) All oxygen-releasing photosynthetic forms
(b) Only higher plants
(c) Higher plants that photosynthesise
(d) All photosynthetic eukaryotes only
Show Answer & Explanation

Answer: (a) All oxygen-releasing photosynthetic forms

Explanation:
1. Chlorophyll a is the universal photosynthetic pigment of all oxygenic photosynthesisers, including cyanobacteria.
2. So it is not restricted to higher plants or eukaryotes.

Teacher's Note:
1. Chlorophyll a is the primary pigment of the reaction centre.

Question 5: In photosystem I, the reaction centre is
(a) P600
(b) P680
(c) P700
(d) P720
Show Answer & Explanation

Answer: (c) P700

Explanation:
1. The reaction centre of PS I is a chlorophyll a molecule absorbing at 700 nm, called P700.
2. P680 is the reaction centre of PS II.

Teacher's Note:
1. P700 for PS I; P680 for PS II.

Question 6: The basic structure of all chlorophylls comprises
(a) Cytochrome system
(b) Flavoproteins
(c) Porphyrin system
(d) Plastocyanin
Show Answer & Explanation

Answer: (c) Porphyrin system

Explanation:
1. Chlorophylls have a tetrapyrrole (porphyrin) ring with a central magnesium atom.
2. The ring is attached to a long phytol chain.

Teacher's Note:
1. Porphyrin rings are also found in haem and cytochromes.

Question 7: What is the by-product of bacterial photosynthesis?
(a) O2
(b) CO2
(c) S
(d) H2S
Show Answer & Explanation

Answer: (c) S

Explanation:
1. Purple and green sulphur bacteria use H2S as the hydrogen donor, which leaves sulphur as the by-product.
2. No oxygen is released, so it is anoxygenic.

Teacher's Note:
1. Van Niel's study of sulphur bacteria suggested the general equation of photosynthesis.

Question 8: In a chlorophyll molecule, Mg is situated in the
(a) Centre of the porphyrin ring
(b) Corner of the porphyrin
(c) Phytol tail
(d) Isocyclic ring
Show Answer & Explanation

Answer: (a) Centre of the porphyrin ring

Explanation:
1. Mg is bonded to the four nitrogen atoms at the centre of the tetrapyrrole ring.
2. The phytol tail is a hydrocarbon chain with no metal.

Teacher's Note:
1. The ring is the light-absorbing head and the tail anchors it in the membrane.

Question 9: The photosynthetic pigments chlorophylls are soluble in
(a) Water
(b) Inorganic solvents
(c) Organic solvents
(d) Water and organic solvents
Show Answer & Explanation

Answer: (c) Organic solvents

Explanation:
1. Chlorophylls are lipid-like and dissolve in organic solvents such as acetone, ether and alcohol.
2. They do not dissolve in water.

Teacher's Note:
1. Pigments are extracted from leaves using acetone or ethanol.

Question 10: Which of the following chlorophylls lacks a phytol tail?
(a) Chlorophyll a
(b) Chlorophyll b
(c) Chlorophyll c
(d) Chlorophyll e
Show Answer & Explanation

Answer: (c) Chlorophyll c

Explanation:
1. Chlorophyll c, found in brown algae and diatoms, has no phytol tail.
2. Chlorophylls a and b have the phytol tail.

Teacher's Note:
1. Phytol is the long hydrophobic chain that anchors the molecule.

Question 11: Which protein is the most abundant on the earth?
(a) Catalase
(b) RuBisCO
(c) Amylase
(d) None of these
Show Answer & Explanation

Answer: (b) RuBisCO

Explanation:
1. RuBisCO is present in huge amounts in all photosynthesising cells.
2. It is the most abundant enzyme in the world.

Teacher's Note:
1. RuBisCO is the enzyme of carboxylation and oxygenation.

Question 12: The universal photosynthetic chlorophyll is
(a) Chlorophyll a
(b) Chlorophyll b
(c) Chlorophyll c
(d) Chlorophyll e
Show Answer & Explanation

Answer: (a) Chlorophyll a

Explanation:
1. Chlorophyll a is present in all oxygenic photosynthetic organisms.
2. It forms the reaction centres of both photosystems.

Teacher's Note:
1. The other chlorophylls and carotenoids are accessory pigments.

Question 13: The site of photolysis of water is the
(a) Stroma of the chloroplast
(b) Cristae of the chloroplast
(c) Ribosome of the chloroplast
(d) Lumen surface of the thylakoid membrane
Show Answer & Explanation

Answer: (d) Lumen surface of the thylakoid membrane

Explanation:
1. The oxygen-evolving complex of PS II lies on the inner (lumen) side of the thylakoid membrane.
2. Water is split there, and the protons accumulate in the lumen.

Teacher's Note:
1. This accumulation helps build the proton gradient.

Question 14: Which one of the following is a precursor of protochlorophyll?
(a) Acetyl CoA
(b) Succinyl CoA
(c) Oxaloacetic acid
(d) Alpha-ketoglutarate
Show Answer & Explanation

Answer: (b) Succinyl CoA

Explanation:
1. Chlorophyll synthesis starts from succinyl CoA, which combines with glycine to form delta-aminolevulinic acid.
2. This forms the porphyrin ring.

Teacher's Note:
1. Light is needed for the last step that converts protochlorophyll to chlorophyll.

Question 15: The first step in photosynthesis is
(a) Joining of three carbon atoms to form glucose
(b) Formation of ATP
(c) Ionisation of water
(d) Excitement of an electron of chlorophyll by a photon of light
Show Answer & Explanation

Answer: (d) Excitement of an electron of chlorophyll by a photon of light

Explanation:
1. The light reaction begins when a photon is absorbed by chlorophyll and an electron is raised to a higher energy level.
2. Water splitting and ATP formation follow.

Teacher's Note:
1. Light absorption comes before everything else.

Question 16: The gain of the light reaction is
(a) ATP and NADPH + H+
(b) NADPH + H+ and glucose
(c) Only ATP
(d) O2 and glucose
Show Answer & Explanation

Answer: (a) ATP and NADPH + H+

Explanation:
1. The light reaction produces ATP and NADPH, which are the assimilatory power for the dark reaction.
2. Glucose is formed only in the Calvin cycle.

Teacher's Note:
1. O2 is released as a by-product.

Question 17: Algae and other submerged plants in water float during the day and sink at night because
(a) They come up to receive O2
(b) They lose weight at night
(c) They become buoyant due to accumulation of O2 as a result of photosynthesis
(d) They become light due to accumulation of food
Show Answer & Explanation

Answer: (c) They become buoyant due to accumulation of O2 as a result of photosynthesis

Explanation:
1. Oxygen produced in the day collects as bubbles on the plants and makes them buoyant.
2. At night no oxygen is produced and they sink.

Teacher's Note:
1. Bubbles in Hydrilla in sunlight is the classical experiment.

Question 18: Which one of the following concerns photophosphorylation?
(a) ADP + AMP + light energy gives ATP
(b) ADP + inorganic phosphate + light energy gives ATP
(c) ADP + inorganic phosphate gives ATP (no light)
(d) AMP + inorganic phosphate gives ATP (no light)
Show Answer & Explanation

Answer: (b) ADP + inorganic phosphate + light energy gives ATP

Explanation:
1. Photophosphorylation is the light-driven addition of inorganic phosphate to ADP to form ATP.
2. Without light, the same reaction is oxidative or substrate-level phosphorylation.

Teacher's Note:
1. Photophosphorylation occurs on the thylakoid membrane.

Question 19: The function of ATP in photosynthesis is to transfer energy from
(a) The dark reaction to the light reaction
(b) The light reaction to the dark reaction
(c) Chloroplasts to mitochondria
(d) Mitochondria to chloroplasts
Show Answer & Explanation

Answer: (b) The light reaction to the dark reaction

Explanation:
1. ATP formed in the light reaction supplies energy for the Calvin cycle.
2. The Calvin cycle is the dark reaction.

Teacher's Note:
1. ATP and NADPH link the two phases.

Question 20: In photosynthesis, hydrogen is transferred from the light reaction to the dark reaction by
(a) DPN
(b) DNA
(c) ATP
(d) NADP
Show Answer & Explanation

Answer: (d) NADP

Explanation:
1. NADP picks up electrons and protons in the light reaction and is converted into NADPH + H+.
2. NADPH then delivers them to the Calvin cycle.

Teacher's Note:
1. DPN is the old name for NAD, which works in respiration.

Question 21: During the photochemical reaction of photosynthesis
(a) Liberation of O2 takes place
(b) Formation of ATP and NADPH2 takes place
(c) Liberation of O2, formation of ATP and NADPH2 takes place
(d) Assimilation of CO2 takes place
Show Answer & Explanation

Answer: (c) Liberation of O2, formation of ATP and NADPH2 takes place

Explanation:
1. The light reaction splits water to release O2 and makes both ATP and NADPH.
2. Assimilation of CO2 happens in the dark reaction.

Teacher's Note:
1. All the three events happen in the photochemical phase.

Question 22: The formation of ATP from ADP and inorganic phosphate in the grana is called
(a) Phosphorylation
(b) Oxidative phosphorylation
(c) Photophosphorylation
(d) Photolysis
Show Answer & Explanation

Answer: (c) Photophosphorylation

Explanation:
1. Light-driven ATP synthesis in the grana is photophosphorylation.
2. Oxidative phosphorylation occurs in mitochondria.

Teacher's Note:
1. Photolysis is the splitting of water.

Question 23: Which of the following is the excited molecule during photosynthesis?
(a) Chlorophyll
(b) Oxygen
(c) Carbon dioxide
(d) Water
Show Answer & Explanation

Answer: (a) Chlorophyll

Explanation:
1. Chlorophyll absorbs the photon and its electron is excited to a higher energy level.
2. Water, CO2 and O2 are not excited.

Teacher's Note:
1. The excited chlorophyll loses an electron to the acceptor.

Question 24: NADPH + H+ is also called
(a) Real power
(b) Oxidising agent
(c) Power house of energy
(d) Reducing power
Show Answer & Explanation

Answer: (d) Reducing power

Explanation:
1. NADPH donates electrons and hydrogen to reduce 3-PGA to a sugar.
2. So it is the reducing power of the cell.

Teacher's Note:
1. ATP and NADPH together are called assimilatory power.

Question 25: During splitting of H2O, the H+ is ultimately captured by
(a) Chlorophyll
(b) NADP
(c) O2
(d) Cytochrome
Show Answer & Explanation

Answer: (b) NADP

Explanation:
1. Electrons from water pass through the chain and reduce NADP+ with the protons to form NADPH + H+.
2. Oxygen is released and not a carrier.

Teacher's Note:
1. The final electron acceptor in the non-cyclic chain is NADP+.

Free study material for Biology

Practice MCQs for NEET Biology Photosynthesis In Higher Plants

About Photosynthesis In Higher Plants MCQs for NEET Biology

Review structured objective questions for NEET Biology Photosynthesis In Higher Plants. Built according to official NEET guidelines, these MCQ sets support daily revision and core concept reinforcement.

How to Verify Your MCQ Answers

Cross-reference your completed choices with comprehensive NCERT solutions for NEET Biology to ensure absolute clarity across all sub-topics in this chapter.

Enhance Speed with Online MCQ Tests

Explore our broader library of printable assignments, chapter notes, and mock tests designed to support continuous revision and secure higher marks in NEET assessments.

FAQs

Where can I access latest NEET Biology Photosynthesis in Higher Plants MCQs Set 19?

You can get most exhaustive NEET Biology Photosynthesis in Higher Plants MCQs Set 19 for free on StudiesToday.com. These MCQs for NEET Biology are updated for the 2026-27 academic session as per NEET examination standards.

Are Assertion-Reasoning and Case-Study MCQs included in the Biology NEET material?

Yes, our NEET Biology Photosynthesis in Higher Plants MCQs Set 19 include the latest type of questions, such as Assertion-Reasoning and Case-based MCQs. 50% of the NEET paper is now competency-based.

How do practicing Biology MCQs help in scoring full marks in NEET exams?

By solving our NEET Biology Photosynthesis in Higher Plants MCQs Set 19, NEET students can improve their accuracy and speed which is important as objective questions provide a chance to secure 100% marks in the Biology.

Do you provide answers and explanations for NEET Biology Photosynthesis in Higher Plants MCQs Set 19?

Yes, Biology MCQs for NEET have answer key and brief explanations to help students understand logic behind the correct option as its important for 2026 competency-focused NEET exams.

Can I practice these Biology NEET MCQs online?

Yes, you can also access online interactive tests for NEET Biology Photosynthesis in Higher Plants MCQs Set 19 on StudiesToday.com as they provide instant answers and score to help you track your progress in Biology.