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100+ Free Tamil Nadu HSE First Year Zoology Practice Questions

Tamil Nadu Higher Secondary First Year (HSE +1 / Class 11) 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 First Year Zoology Exam

10:00–1:15

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

DGE TN HSE 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 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 11 Bio-Zoology 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

Class 11

HSE First Year (+1) Zoology covers animal diversity, structural organisation, cell/biomolecules, and physiology foundations

Samacheer Kalvi Class 11 Bio-Zoology textbooks

Free English MCQ practice for Tamil Nadu HSE +1 Zoology (DGE). Official paper is mixed written theory on the Samacheer Kalvi Class 11 Bio-Zoology syllabus — this bank is a study adaptation, not a format simulation.

Sample Tamil Nadu HSE First Year Zoology Practice Questions

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

1The scientific naming system of binomial nomenclature was popularised by:
A.Charles Darwin
B.Gregor Mendel
C.Carolus Linnaeus
D.Aristotle
Explanation: Carolus Linnaeus established binomial nomenclature: genus name + specific epithet. Darwin proposed natural selection; Mendel worked on inheritance; Aristotle classified animals descriptively without modern binomials.
2In the taxonomic hierarchy, which rank is immediately above genus?
A.Species
B.Family
C.Order
D.Class
Explanation: The standard ascending order is species → genus → family → order → class → phylum → kingdom. Family is the rank immediately above genus.
3Which is the correct sequence of taxonomic categories from lowest to highest?
A.Species → Genus → Family → Order
B.Genus → Species → Family → Order
C.Species → Family → Genus → Order
D.Family → Species → Genus → Order
Explanation: Species is the basic unit; related species form a genus; related genera form a family; related families form an order.
4Animals that lack true tissues and have a cellular level of organisation belong mainly to:
A.Porifera
B.Cnidaria
C.Platyhelminthes
D.Annelida
Explanation: Poriferans (sponges) show a cellular level of organisation without true tissues or organs. Cnidarians have tissue level; flatworms and annelids are more complex with organ systems.
5Choanocytes (collar cells) that create water currents are characteristic of:
A.Cnidaria
B.Ctenophora
C.Porifera
D.Echinodermata
Explanation: Choanocytes line the spongocoel/canals of sponges and beat flagella to drive water flow for filter feeding. They are a hallmark of Porifera.
6Cnidocytes containing nematocysts are diagnostic of which phylum?
A.Cnidaria
B.Porifera
C.Platyhelminthes
D.Mollusca
Explanation: Cnidarians possess cnidocytes with nematocysts used for defence and prey capture (e.g., Hydra, jellyfish, corals).
7Animals that are diploblastic and radially symmetrical typically include:
A.Cnidarians such as Hydra
B.Earthworms
C.Insects
D.Frogs
Explanation: Cnidarians (and ctenophores) are diploblastic with radial symmetry. Earthworms, insects, and frogs are triploblastic with bilateral symmetry.
8The body cavity completely lined by mesoderm is called a:
A.Pseudocoelom
B.True coelom (eucoelom)
C.Haemocoel
D.Blastocoel
Explanation: A true coelom is a body cavity lined entirely by mesoderm (as in annelids, molluscs, echinoderms, chordates). A pseudocoelom is incompletely lined; haemocoel is blood-filled; blastocoel is an embryonic cavity.
9Nematodes (roundworms) are best described as:
A.Acoelomate and diploblastic
B.Pseudocoelomate and triploblastic
C.Eucoelomate and diploblastic
D.Acoelomate and triploblastic only
Explanation: Aschelminthes/Nematoda are triploblastic, bilaterally symmetrical, and pseudocoelomate with a complete digestive tract.
10Metameric segmentation (true segments) is a hallmark of:
A.Porifera
B.Cnidaria
C.Annelida
D.Nematoda
Explanation: Annelids show metameric segmentation with repeated body segments (metameres). Sponges and cnidarians lack this; nematodes are unsegmented.

About the Tamil Nadu HSE First Year Zoology Practice Questions

Verified exam format metadata for Tamil Nadu Higher Secondary First Year (HSE +1 / Class 11) 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.