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Free Practice Questions for Tamil Nadu HSE Second Year Microbiology

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

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

1Microbiology is best defined as the scientific study of:
A.Only macroscopic plants used as crops
B.Only non-living chemical catalysts in industry
C.Microscopic organisms and related agents such as bacteria, fungi, algae, protozoa, and viruses
D.Only large multicellular animals
Explanation: Microbiology studies microscopic life forms and associated acellular agents (viruses) that require specialised methods such as microscopy and culture.
2Who is widely credited with first observing and describing microorganisms using simple microscopes?
A.Louis Pasteur
B.Robert Koch
C.Antonie van Leeuwenhoek
D.Alexander Fleming
Explanation: Antonie van Leeuwenhoek (17th century) used high-quality simple microscopes to describe 'animalcules' (bacteria and protozoa).
3Which feature is characteristic of prokaryotic cells such as bacteria?
A.Membrane-bound nucleus with multiple linear chromosomes
B.Mitochondria performing oxidative phosphorylation
C.Absence of a true nucleus; genetic material typically in a nucleoid
D.Endoplasmic reticulum for protein sorting
Explanation: Prokaryotes lack a membrane-bound nucleus; DNA usually lies in a nucleoid region, and membrane-bound organelles like mitochondria and ER are absent.
4The rigid bacterial cell wall of most bacteria is primarily composed of:
A.Cellulose microfibrils only
B.Chitin only
C.Peptidoglycan (murein)
D.Cholesterol bilayers only
Explanation: Peptidoglycan (murein) is the polymer of sugars and peptides that gives most bacterial cell walls strength and shape; antibiotics such as penicillin target its synthesis.
5Gram-positive bacteria typically appear purple after Gram staining primarily because they have:
A.A thin peptidoglycan layer and an outer membrane that loses crystal violet
B.No cell wall at all
C.A thick peptidoglycan layer that retains the crystal violet–iodine complex
D.Only a lipid bilayer without any wall polymers
Explanation: Gram-positive walls have thick peptidoglycan that traps the crystal violet–iodine complex; alcohol decolorisation does not remove it readily, so cells stay purple after counterstaining.
6Which structure helps some bacteria resist phagocytosis and desiccation by forming a sticky outer layer?
A.Mesosome
B.Ribosome
C.Capsule or slime layer (glycocalyx)
D.Nucleoid only
Explanation: Capsules and slime layers (glycocalyx) are polysaccharide- or protein-rich outer coats that can inhibit phagocytosis, aid adhesion, and protect against drying.
7Bacterial endospores are best described as:
A.Active vegetative cells that divide rapidly in rich media
B.Viral particles assembled inside host cells
C.Highly resistant dormant forms produced by certain Gram-positive genera such as Bacillus and Clostridium
D.Fungal fruiting bodies that release basidiospores only
Explanation: Endospores are metabolically dormant, heat- and chemical-resistant structures formed by genera such as Bacillus and Clostridium under stress; they are not a reproductive strategy like fungal spores.
8Flagella in bacteria primarily function in:
A.Protein synthesis
B.Photosynthesis
C.Motility (locomotion)
D.DNA replication
Explanation: Bacterial flagella are rotary motility organelles powered by a proton (or sodium) motive force, enabling swimming in liquid environments.
9Pili (fimbriae) are bacterial surface structures most often associated with:
A.ATP synthesis on the outer membrane
B.Storage of poly-β-hydroxybutyrate
C.Adhesion to surfaces and, for sex pili, conjugative DNA transfer
D.Spore coat formation only
Explanation: Fimbriae/pili mediate attachment to host cells and surfaces; specialised sex (F) pili enable conjugative plasmid transfer between bacteria.
10Viruses are considered acellular infectious agents primarily because they:
A.Have a complete set of organelles and divide by binary fission on agar plates
B.Always possess both DNA and RNA genomes simultaneously as free-living cells
C.Consist of nucleic acid enclosed in a protein coat (capsid) and can replicate only inside living host cells
D.Are identical to bacterial endospores in structure and metabolism
Explanation: Virions package DNA or RNA in a capsid (sometimes with an envelope) and are obligate intracellular parasites that hijack host machinery for replication.

About the Tamil Nadu HSE Second Year Microbiology Exam

Tamil Nadu HSE Second Year Microbiology is the Class 12 public examination subject paper in Micro Biology under DGE Tamil Nadu. It assesses SCERT/Samacheer Kalvi Class 12 learning outcomes for this subject. Official assessment is a mixed written theory paper (with practical and internal components where applicable) totaling 100 marks per subject. Vocational/general stream elective with practical components on DGE timetable as MICRO BIOLOGY. Use this free English MCQ bank to build concept fluency before the March public exams.

Exam sponsor: Directorate of Government Examinations (DGE), Tamil Nadu. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Official Tamil Nadu HSE Second Year (+2) public examination paper in Micro Biology, administered by DGE Tamil Nadu. March 2026 theory window: 02.03.2026–26.03.2026; practical window for +2: 09.02.2026–14.02.2026 (official timetable). Each theory sitting runs 10:00 a.m.–1:15 p.m. including question-paper reading and particulars verification (about 3 hours writing after reading). For subjects with practical: theory is commonly assessed out of 70 marks (minimum 15 in theory) with practical attendance required, internal assessment contributing to the 100-mark subject total. Official assessment is mixed written format (short/long/structured items per the year's blueprint), not pure MCQ. Vocational/general stream elective with practical components on DGE timetable as MICRO BIOLOGY. Syllabus and textbooks are prescribed by SCERT / Director of School Education (Samacheer Kalvi Class 12). This site's bank is an English-language multiple-choice study adaptation for concept fluency — not an official translation, format simulation, or substitute for writing, practical, project, or oral evidence.

Time Limit

Official theory sitting 10:00 a.m.–1:15 p.m. (about 3 hours writing after reading/verification) per March 2026 DGE timetable

Passing Score

Minimum 35 out of 100 per subject overall under the new 600-mark HSE pattern (HSE_E.pdf), with additional floors: theory minimum 15/70 and must appear for practical for practical-bearing subjects. Confirm the current DGE result rules for your candidate category.

Exam / Certification Fees

School candidates: DGE HSE scheme lists examination fee ₹200 for groups with practical subjects, plus Mark Certificate ₹20 and Service Charges ₹5 (Tamil-medium candidates and notified concession categories are often fee-exempt). Private (H) candidates: per-subject fees as notified (scheme text commonly cites subject + registration/mark/service components). Confirm current-session circulars on dge.tn.gov.in — fee tables can be updated by notification.

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

25%

Microbial Diversity and Structure

Bacteria, viruses, fungi, algae, and microbial cell structure.

25%

Microbial Physiology and Genetics

Growth, metabolism, and microbial genetics basics.

30%

Medical and Applied Microbiology

Pathogens, immunology basics, food, industrial, and environmental microbiology.

20%

Lab Methods and Biosafety

Sterilisation, culture techniques, staining, and lab safety concepts.

Preparing for the Tamil Nadu HSE Second Year Microbiology Exam

What You Need to Know

  • Passing score: Minimum 35 out of 100 per subject overall under the new 600-mark HSE pattern (HSE_E.pdf), with additional floors: theory minimum 15/70 and must appear for practical for practical-bearing subjects. Confirm the current DGE result rules for your candidate category.
  • Assessment: Official Tamil Nadu HSE Second Year (+2) public examination paper in Micro Biology, administered by DGE Tamil Nadu. March 2026 theory window: 02.03.2026–26.03.2026; practical window for +2: 09.02.2026–14.02.2026 (official timetable). Each theory sitting runs 10:00 a.m.–1:15 p.m. including question-paper reading and particulars verification (about 3 hours writing after reading). For subjects with practical: theory is commonly assessed out of 70 marks (minimum 15 in theory) with practical attendance required, internal assessment contributing to the 100-mark subject total. Official assessment is mixed written format (short/long/structured items per the year's blueprint), not pure MCQ. Vocational/general stream elective with practical components on DGE timetable as MICRO BIOLOGY. Syllabus and textbooks are prescribed by SCERT / Director of School Education (Samacheer Kalvi Class 12). This site's bank is an English-language multiple-choice study adaptation for concept fluency — not an official translation, format simulation, or substitute for writing, practical, project, or oral evidence.
  • Time limit: Official theory sitting 10:00 a.m.–1:15 p.m. (about 3 hours writing after reading/verification) per March 2026 DGE timetable
  • Exam / certification fees: School candidates: DGE HSE scheme lists examination fee ₹200 for groups with practical subjects, plus Mark Certificate ₹20 and Service Charges ₹5 (Tamil-medium candidates and notified concession categories are often fee-exempt). Private (H) candidates: per-subject fees as notified (scheme text commonly cites subject + registration/mark/service components). Confirm current-session circulars on dge.tn.gov.in — fee tables can be updated by notification. Official sources

Using Our Practice Resources

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

Tamil Nadu HSE Second Year Microbiology: Suggested Study Strategy

1Study from the current SCERT / Samacheer Kalvi Class 12 Microbiology textbooks and the year's model question paper pattern released for DGE public exams.
2Practise both conceptual MCQs and the official long/short answer formats; this bank cannot replace writing or practical skill evidence.
3For calculation-heavy units, rework numerical problems with units and significant figures as used in the textbook examples.
4Use the official timetable to plan revision around your specific Part I / II / III sitting dates.
5After each practice set, log weak topic areas (by unit) and re-read those textbook chapters before retesting.

Frequently Asked Questions

What is the Tamil Nadu HSE Second Year Microbiology exam?

It is the official Class 12 (Higher Secondary Second Year / +2) public examination paper in Micro Biology, conducted by the Directorate of Government Examinations (DGE), Tamil Nadu, under the State Board / Samacheer Kalvi syllabus.

How long is the official theory paper?

The March 2026 timetable schedules each theory sitting from 10:00 a.m. to 1:15 p.m., including question-paper reading and candidate particulars verification before the main writing period.

What is the passing score?

Minimum 35 out of 100 per subject overall under the new 600-mark HSE pattern (HSE_E.pdf), with additional floors: theory minimum 15/70 and must appear for practical for practical-bearing subjects. Confirm the current DGE result rules for your candidate category.

Is this practice bank the same format as the official paper?

No. Official papers use mixed written formats (and practicals where applicable). These 100 questions are an English-language multiple-choice study adaptation for knowledge and judgment practice only.

Where can I find the official timetable and scheme?

Download the public examination timetable and HSE scheme documents from the Directorate of Government Examinations website (dge.tn.gov.in), including the March 2026 HSE+2 timetable PDF.