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100+ Free Tamil Nadu HSE Second Year Botany Practice Questions

Tamil Nadu Higher Secondary Second Year (HSE +2 / Class 12) Botany under the Directorate of Government Examinations (DGE), Tamil Nadu practice questions are available now; exam metadata is being verified.

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2026 Statistics

Key Facts: Tamil Nadu HSE Second Year Botany Exam

10:00–1:15

Official March 2026 HSE+2 theory sitting window including reading/verification time (dge.tn.gov.in timetable)

DGE TN HSE+2 March 2026 public examination timetable

35/100

Minimum pass mark per subject under the HSE new pattern, subject to theory/practical floor rules

DGE HSE_E.pdf scheme of examination

3 hours

Approximate theory writing duration after reading and particulars verification in the public exam schedule

DGE TN HSE+2 March 2026 timetable

DGE TN

Administered by the Directorate of Government Examinations, Chennai, for Tamil Nadu State Board Higher Secondary

dge.tn.gov.in

SCERT syllabus

Class 12 textbooks and syllabus prescribed by SCERT / School Education Department (Samacheer Kalvi)

DGE HSE scheme — syllabus prescribed by SCERT/DSE

English MCQ bank

This practice set is an English-language MCQ study adaptation, not the official mixed written paper

OpenExamPrep practice-content policy

₹150/₹200

School exam fee band for groups without/with practical subjects plus certificate/service charges (concessions apply)

DGE HSE_E.pdf school candidate fee table

March 2026

HSE Second Year public theory examinations scheduled 2–26 March 2026 with practicals 9–14 February 2026

DGE TN official timetable PDF 04.11.2025

Free English MCQ practice for Tamil Nadu HSE +2 Botany (DGE). Official paper is mixed written theory on the Samacheer Kalvi Class 12 syllabus — this bank is a study adaptation, not a format simulation.

Sample Tamil Nadu HSE Second Year Botany Practice Questions

Try these sample questions to test your Tamil Nadu HSE Second Year Botany exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In C3 plants, the primary CO2 acceptor in the Calvin cycle is:
A.RuBP (ribulose-1,5-bisphosphate)
B.PEP (phosphoenolpyruvate)
C.OAA (oxaloacetic acid)
D.3-PGA (3-phosphoglyceric acid)
Explanation: In C3 plants, Rubisco carboxylates RuBP, fixing CO2 into a six-carbon intermediate that splits into two molecules of 3-PGA. RuBP is therefore the primary CO2 acceptor of the Calvin cycle.
2The light-dependent reactions of photosynthesis occur in the:
A.Stroma of the chloroplast
B.Matrix of the mitochondrion
C.Cytosol of the mesophyll cell
D.Thylakoid membrane of the chloroplast
Explanation: Photosystems, electron transport chains, and ATP synthase are embedded in the thylakoid membrane, where light energy drives photolysis of water, NADPH formation, and photophosphorylation.
3Which pigment is the reaction-centre chlorophyll of Photosystem II in higher plants?
A.Phycoerythrin
B.Xanthophyll
C.P680
D.P700
Explanation: Photosystem II's reaction centre is P680 (absorbs maximally near 680 nm). It oxidizes water and feeds electrons into the non-cyclic electron transport chain.
4During non-cyclic photophosphorylation, the final electron acceptor is:
A.Ferredoxin alone without NADP+
B.NADP+
C.Oxygen
D.Water
Explanation: In non-cyclic (linear) electron flow, electrons from water ultimately reduce NADP+ to NADPH via ferredoxin-NADP+ reductase. NADP+ is the terminal electron acceptor of the chain.
5The first stable product of CO2 fixation in C4 plants (Hatch-Slack pathway) is a:
A.4-carbon compound (oxaloacetate)
B.3-carbon compound (3-PGA)
C.5-carbon compound (RuBP)
D.6-carbon sugar (glucose)
Explanation: In C4 plants, PEPcase in mesophyll cells carboxylates PEP to form the four-carbon acid oxaloacetate (quickly converted to malate or aspartate). This is the defining first product of the Hatch-Slack pathway.
6Kranz anatomy is a characteristic feature of:
A.All C3 plants without exception
B.Only aquatic hydrophytes
C.Gymnosperms exclusively
D.C4 plants such as maize and sugarcane
Explanation: Kranz anatomy shows vascular bundles sheathed by large chloroplast-rich bundle-sheath cells, with surrounding mesophyll. It is typical of many C4 grasses (e.g., maize, sugarcane) and supports spatial separation of PEPcase and Rubisco activities.
7Photorespiration is favoured when the relative concentration of O2 is high and CO2 is low because Rubisco then acts as an:
A.Peptidase
B.Amylase
C.Oxygenase
D.Kinase only
Explanation: Rubisco has dual carboxylase/oxygenase activity. High O2:CO2 ratios favour oxygenation of RuBP, initiating the photorespiratory (C2) pathway that releases CO2 and wastes energy—especially in C3 plants under hot, bright, stomata-closed conditions.
8Which of the following correctly pairs a C4 plant with a C3 plant?
A.Potato and rice as both C4
B.Maize and wheat (C4 then C3)
C.Rice and sugarcane (C3 then C4, reversed from the asked order)
D.Both wheat and rice as C4 plants
Explanation: Maize (Zea mays) is a classic C4 plant; wheat (Triticum) is C3. That pairing correctly contrasts C4 with C3.
9In aerobic respiration, glycolysis occurs in the:
A.Cytosol
B.Mitochondrial matrix
C.Inner mitochondrial membrane
D.Chloroplast stroma
Explanation: Glycolysis is a cytosolic pathway that converts glucose to pyruvate (net 2 ATP and 2 NADH per glucose under standard textbook accounting), independent of mitochondria.
10The number of ATP molecules theoretically generated from complete aerobic oxidation of one glucose molecule in plants (standard textbook yield often taught) is approximately:
A.2 ATP only
B.4 ATP only from glycolysis
C.12 ATP with no oxidative phosphorylation
D.36-38 ATP
Explanation: Complete aerobic oxidation of glucose yields roughly 36-38 ATP in classic school-level accounting (glycolysis + Krebs + oxidative phosphorylation), though modern estimates are somewhat lower due to shuttle and proton-leak costs. The standard Class 12 figure remains about 36-38.

About the Tamil Nadu HSE Second Year Botany Practice Questions

Verified exam format metadata for Tamil Nadu Higher Secondary Second Year (HSE +2 / Class 12) Botany under the Directorate of Government Examinations (DGE), Tamil Nadu is pending. The practice questions above remain available while official exam length, timing, passing score, fee, and administrator details are reviewed.