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100+ Free Tamil Nadu HSE Second Year Zoology Practice Questions

Tamil Nadu Higher Secondary Second Year (HSE +2 / Class 12) Zoology 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 Zoology 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 Zoology (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 Zoology Practice Questions

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

1Which enzyme begins chemical digestion of starch in the human mouth?
A.Amylase (ptyalin)
B.Pepsin
C.Lipase
D.Trypsin
Explanation: Salivary amylase (ptyalin) hydrolyses starch to maltose in the mouth under slightly alkaline conditions. Pepsin and trypsin digest proteins, and lipase digests fats.
2Hydrochloric acid in gastric juice is secreted mainly by which stomach cells?
A.Chief (peptic) cells
B.Parietal (oxyntic) cells
C.Goblet cells
D.Mucous neck cells only
Explanation: Parietal (oxyntic) cells of gastric glands secrete HCl and intrinsic factor. Chief cells secrete pepsinogen; goblet and mucous cells secrete mucus that protects the mucosa.
3Most absorption of digested nutrients in humans occurs in the:
A.Stomach
B.Large intestine
C.Small intestine
D.Oesophagus
Explanation: The small intestine (especially jejunum and ileum) has villi and microvilli that provide a huge surface area for absorption of monosaccharides, amino acids, fatty acids, vitamins, and minerals.
4Bile salts aid fat digestion primarily by:
A.Hydrolysing peptide bonds
B.Neutralising pancreatic enzymes
C.Activating pepsinogen to pepsin
D.Emulsifying fats into smaller droplets
Explanation: Bile salts emulsify large fat globules into smaller micelle-forming droplets, increasing surface area for pancreatic lipase. They do not themselves hydrolyse peptide bonds or activate pepsinogen.
5Which pancreatic enzyme converts proteins into smaller peptides in the duodenum?
A.Trypsin
B.Lipase
C.Amylase
D.Maltase
Explanation: Trypsin (from trypsinogen activated by enterokinase) cleaves proteins into peptides in the small intestine. Amylase digests starch, lipase digests fats, and maltase is an intestinal brush-border enzyme.
6In humans, the primary site of gas exchange between air and blood is the:
A.Trachea
B.Alveoli
C.Bronchi
D.Larynx
Explanation: Alveoli are thin-walled air sacs richly supplied with capillaries; O2 and CO2 diffuse across the alveolar–capillary membrane. Trachea, bronchi, and larynx mainly conduct and condition air.
7Most carbon dioxide is transported in human blood as:
A.Dissolved CO2 gas only
B.Carbaminohaemoglobin only
C.Bicarbonate ions (HCO3−)
D.Carboxyhaemoglobin
Explanation: About 70% of CO2 is transported as bicarbonate after carbonic anhydrase converts CO2 to carbonic acid in red cells, which dissociates to HCO3− and H+. Smaller fractions travel dissolved or as carbamino compounds.
8The volume of air inspired or expired during a normal quiet breath is called:
A.Vital capacity
B.Inspiratory reserve volume
C.Residual volume
D.Tidal volume
Explanation: Tidal volume is the air moved in or out in a normal quiet breath (about 500 mL in a healthy adult). Vital capacity is a sum of several volumes; residual volume remains after maximal expiration.
9Oxygen is mainly carried in blood bound to which part of haemoglobin?
A.Iron in the haem group
B.Globin protein only
C.Carbon of the porphyrin ring alone
D.Plasma albumin
Explanation: Each haem contains Fe2+ that binds one O2 molecule; four haem groups per haemoglobin allow up to four O2. Plasma carries only a small dissolved O2 fraction.
10The respiratory rhythm centre that primarily sets the basic breathing rhythm in humans is located in the:
A.Cerebellum
B.Medulla oblongata
C.Hypothalamus only
D.Spinal cord lumbar region
Explanation: The medullary respiratory centres generate the basic rhythm of inspiration and expiration. The pons modulates pattern; higher centres and chemoreceptors adjust rate and depth.

About the Tamil Nadu HSE Second Year Zoology Practice Questions

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