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100+ Free CHSE Odisha Elective Biology Practice Questions

Council of Higher Secondary Education, Odisha (CHSE Odisha) Higher Secondary (+2) Elective Biology (Science stream — Botany & Zoology) practice questions are available now; exam metadata is being verified.

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2026 Statistics

Key Facts: CHSE Odisha Elective Biology Exam

200 marks

Elective Biology total across Year 1 (100) + Year 2 (100)

CHSE Odisha Science Courses of Studies / BFC PCMB

70+30

Theory + practical split each year (Botany/Zoology theory 35+35; practical 15+15)

CHSE Odisha Biology (+2) course structure

10 units

Five Class XI + five Class XII units from diversity through ecology

CHSE Odisha rationalised Biology syllabus

1.5 h × 2

Typical Botany and Zoology theory section times at 35 marks each

CHSE Odisha Biology theory course structure

In AHSE fee

Theory fee via session exam structure; practical fees per Botany/Zoology paper as notified

CHSE Odisha AHSE fee notifications via colleges

CHSE Odisha Elective Biology is a +2 Science elective (200 marks: 100+100 with 70 theory + 30 practical each year, Botany & Zoology split). Official papers mix objective and constructed-response items plus practicals—not a pure MCQ board paper. This free 2026 bank is an English MCQ study adaptation aligned to official units.

Sample CHSE Odisha Elective Biology Practice Questions

Try these sample questions to test your CHSE Odisha Elective Biology exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In the CHSE +2 Biology living-world framework, which feature is generally treated as the defining property of living organisms that is most difficult for non-living systems to fully mimic?
A.Presence of carbon atoms only
B.Ability to crystallize like minerals
C.Metabolism of open systems exchanging matter and energy
D.Complete absence of cellular organization in all cases
Explanation: Living systems continuously exchange matter and energy (open systems) and show organised metabolism. Non-living crystals may grow, but they lack the regulated, self-maintaining metabolic organisation of life.
2According to the binomial nomenclature system used in biological classification, which statement is correct?
A.Both words are always written in all capital letters
B.The first word is the genus name and is capitalised; the second is the specific epithet and is not capitalised
C.The first word is the family name and the second is the genus
D.Only the second word is italicised and the first is never capitalised
Explanation: In binomial nomenclature (Linnaeus), the scientific name has two Latinised words: Genus (capitalised) + specific epithet (lowercase), usually italicised or underlined.
3Which kingdom in the five-kingdom classification of Whittaker is characterised by eukaryotic, multicellular organisms that are typically autotrophic and have cell walls of cellulose?
A.Monera
B.Fungi
C.Protista
D.Plantae
Explanation: Plantae includes multicellular eukaryotic green plants with cellulose cell walls and photosynthetic nutrition. Monera are prokaryotes; fungi have chitinous walls and absorb nutrition; Protista are mostly unicellular eukaryotes.
4Cyanobacteria (blue-green algae) are placed under Monera primarily because they:
A.Have cellulose cell walls like flowering plants
B.Are prokaryotic and lack a true nucleus and membrane-bound organelles
C.Always form true multicellular tissues with differentiated organs
D.Store food exclusively as starch in chloroplasts
Explanation: Cyanobacteria are photosynthetic prokaryotes: no true nucleus or membrane-bound organelles, so they belong to Monera despite plant-like photosynthesis.
5In the plant kingdom classification used at +2 level, bryophytes are often called the amphibians of the plant kingdom because they:
A.Live only in deep marine water throughout their life cycle
B.Require water for sexual reproduction though the plant body is usually terrestrial
C.Have true xylem and phloem like gymnosperms
D.Produce seeds enclosed in fruits
Explanation: Bryophytes live on land but need water for swimming male gametes to fertilise eggs—hence the amphibian analogy.
6Which statement correctly distinguishes gymnosperms from angiosperms?
A.Gymnosperms always lack seeds while angiosperms always have spores only
B.Gymnosperms have double fertilisation forming endosperm as a rule; angiosperms never do
C.Gymnosperms bear naked seeds not enclosed in a fruit; angiosperms enclose seeds in fruits derived from ovaries
D.Gymnosperms are exclusively aquatic algae
Explanation: Gymnosperm ovules/seeds are naked (not inside a fruit). Angiosperm seeds develop inside fruits formed from ovaries; double fertilisation is a hallmark of angiosperms.
7In animal classification, coelenterates (Cnidaria) are characterised by:
A.A true coelom lined by mesoderm and a complete segmented body always
B.Tissue-level organisation with cnidoblasts and a gastrovascular cavity
C.Chitinous exoskeleton and jointed appendages as in arthropods
D.Mammary glands and hair
Explanation: Cnidarians show tissue grade of organisation, cnidocytes/cnidoblasts for defence and capture, and a single gastrovascular cavity with one opening.
8Which phylum includes animals that are triploblastic, bilaterally symmetrical, and have a true coelom with metameric segmentation, such as earthworms?
A.Porifera
B.Ctenophora
C.Annelida
D.Platyhelminthes
Explanation: Annelids are triploblastic, bilaterally symmetrical, coelomate, and metamerically segmented (e.g., earthworm).
9Arthropods are the most successful animal group partly because of which combination of traits?
A.Notochord throughout life and dorsal hollow nerve cord only
B.Absence of any cuticle and exclusively intracellular digestion
C.Closed circulatory system with haemoglobin in all species and no moulting
D.Chitinous exoskeleton, jointed appendages, and segmented body
Explanation: Arthropod success is linked to jointed appendages, a protective chitinous exoskeleton, and metameric body plan (with ecdysis).
10In chordates, which structure is present at least in the embryonic stage of all members of the phylum?
A.Ventral solid nerve cord only as in annelids
B.Chitinous jointed legs
C.Notochord
D.Mantle and radula as in molluscs
Explanation: Chordates share a notochord (at least embryonically), dorsal hollow nerve cord, pharyngeal slits (at some stage), and post-anal tail (at some stage).

About the CHSE Odisha Elective Biology Practice Questions

Verified exam format metadata for Council of Higher Secondary Education, Odisha (CHSE Odisha) Higher Secondary (+2) Elective Biology (Science stream — Botany & Zoology) is pending. The practice questions above remain available while official exam length, timing, passing score, fee, and administrator details are reviewed.