PracticeVideosBlogFlashcardsEspañol
All Practice Exams

100+ Free Tamil Nadu HSE Second Year Biology Practice Questions

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

✓ No registration✓ No credit card✓ No hidden fees✓ Start practicing immediately
100+ Questions
100% Free

Loading practice questions...

Same family resources

Explore More Tamil Nadu HSE Second Year / Class 12 (DGE)

Continue into nearby exams from the same family. Each card keeps practice questions, study guides, flashcards, videos, and articles in one place.

Tamil Nadu HSE Second Year Accountancy (DGE)

Practice Questions

Tamil Nadu HSE Second Year Advanced Language (Tamil) (DGE)

Practice Questions

Tamil Nadu HSE Second Year Agricultural Science (DGE)

Practice Questions

Tamil Nadu HSE Second Year Basic Automobile Engineering (DGE)

Practice Questions

Tamil Nadu HSE Second Year Basic Civil Engineering (DGE)

Practice Questions

Tamil Nadu HSE Second Year Basic Electrical Engineering (DGE)

Practice Questions
2026 Statistics

Key Facts: Tamil Nadu HSE Second Year Biology 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 Biology (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 Biology Practice Questions

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

1In angiosperms, double fertilization produces a diploid zygote and a typically triploid endosperm because one male gamete fuses with the egg and the other fuses with:
A.The two polar nuclei of the central cell
B.The synergid nucleus only
C.The antipodal cells only
D.The nucellus
Explanation: Double fertilization is characteristic of flowering plants: one sperm fertilizes the egg (2n zygote) and the other fuses with the two polar nuclei of the central cell (usually 3n primary endosperm nucleus).
2Vegetative propagation by stem cuttings is commercially important in plants such as rose and sugarcane mainly because it:
A.Always introduces new genetic variation
B.Produces clones that retain parental traits
C.Requires meiosis in the cutting
D.Eliminates the need for vascular tissue
Explanation: Asexual/vegetative propagation yields genetically identical offspring (clones), so desirable parental characters are conserved—an advantage in horticulture and agriculture.
3In a typical angiosperm embryo sac (Polygonum type), the number of nuclei present after full development is:
A.4
B.6
C.8
D.7
Explanation: The mature Polygonum-type embryo sac is 7-celled but 8-nucleate: egg apparatus (egg + 2 synergids), central cell with 2 polar nuclei, and 3 antipodals.
4Self-incompatibility in flowering plants primarily prevents:
A.Cross-pollination between different species
B.Pollen germination on any stigma
C.Seed dispersal by animals
D.Fertilization by pollen of the same plant or genetically similar plant
Explanation: Self-incompatibility is a genetic mechanism that blocks fertilization by self pollen (or pollen sharing the same S alleles), promoting outbreeding.
5Which plant growth regulator is most directly associated with promoting cell elongation in stems and apical dominance?
A.Auxin (IAA)
B.Abscisic acid
C.Ethylene
D.Cytokinin only
Explanation: Auxins (e.g., IAA) promote cell elongation in coleoptiles/stems and help maintain apical dominance by suppressing lateral buds.
6During the light reactions of photosynthesis, the photolysis of water primarily occurs associated with:
A.Photosystem I only
B.Photosystem II (oxygen-evolving complex)
C.RuBisCO in the stroma
D.Mitochondrial complex IV
Explanation: Water is split at the oxygen-evolving complex of Photosystem II, releasing O2, protons, and electrons that replace those lost by P680.
7C4 plants minimize photorespiration mainly by:
A.Eliminating chlorophyll b
B.Performing the Calvin cycle only at night
C.Concentrating CO2 at RuBisCO via a spatial separation of initial fixation and the Calvin cycle
D.Using only cyclic photophosphorylation
Explanation: In C4 anatomy, PEPcase fixes CO2 in mesophyll and C4 acids release CO2 in bundle sheath cells, elevating CO2 around RuBisCO and suppressing oxygenase activity.
8In aerobic respiration of plants, the complete oxidation of one glucose molecule yields a theoretical maximum of about how many ATP in many textbook summaries (substrate-level + oxidative phosphorylation estimates)?
A.2 ATP
B.8 ATP
C.100 ATP
D.36–38 ATP (classical estimate)
Explanation: Class 12 texts commonly cite ~36–38 ATP per glucose for complete aerobic respiration (glycolysis + Krebs + ETS), though modern estimates may differ slightly with shuttle systems.
9Transpiration pull contributes to ascent of sap primarily because water columns in xylem are held by:
A.Cohesion among water molecules and adhesion to xylem walls under tension
B.Covalent bonding between cellulose and lignin only
C.Active transport of water by companion cells
D.Root pressure alone in all tall trees
Explanation: The cohesion–tension theory explains that evaporation from leaves creates negative pressure transmitted through cohesive water columns adhered to xylem walls.
10Which statement correctly distinguishes cyclic from non-cyclic photophosphorylation?
A.Cyclic produces O2 and NADPH; non-cyclic does not
B.Non-cyclic involves both PSI and PSII and yields ATP, NADPH, and O2; cyclic mainly around PSI yields ATP only
C.Both pathways always split water equally
D.Cyclic is the only path that reduces NADP+
Explanation: Non-cyclic (Z-scheme) electron flow from H2O through PSII and PSI produces ATP, NADPH, and O2. Cyclic flow around PSI supplements ATP without NADPH or O2 evolution.

About the Tamil Nadu HSE Second Year Biology Practice Questions

Verified exam format metadata for Tamil Nadu Higher Secondary Second Year (HSE +2 / Class 12) Biology 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.