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100+ Free WBCHSE HS Biological Science Practice Questions

Prepare for the West Bengal Council of Higher Secondary Education Higher Secondary Biological Science exam with instant access — no signup required.

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Key Facts: WBCHSE HS Biological Science Exam

BIOS

Official WBCHSE subject code

https://wbchse.wb.gov.in/subjects/

30%

Minimum pass in theory and practical/project independently

https://wbchse.wb.gov.in/frequently-asked-questions-examination

INR 215

Class XII semester enrolment total (INR 190 to Council)

WBCHSE Memo L/PR/305/2025

bn+en

Non-language elective paper media (Bengali and English)

WBCHSE examination regulations

Sem I–IV

Higher Secondary semester system across Classes XI–XII

https://wbchse.wb.gov.in/annual-working-plan

The WBCHSE HS Biological Science exam tests students on advanced biological concepts preparing them for higher studies and medical entrances. English-language MCQ study adaptation for WBCHSE HS—not an official board paper.

Sample WBCHSE HS Biological Science Practice Questions

Try these sample questions to test your WBCHSE HS Biological Science exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which of the following vegetative propagules is responsible for propagation in water hyacinth (Eichhornia crassipes)?
A.Offset
B.Stolon
C.Runner
D.Sucker
Explanation: Water hyacinth reproduces vegetatively by means of offsets. Offsets are short horizontal branches carrying a rosette of leaves and a tuft of roots at each node, allowing rapid clonal spreading across water bodies.
2What is the ploidy level of the functional megaspore and the primary endosperm nucleus (PEN) in a typical angiosperm, respectively?
A.Haploid (n) and Triploid (3n)
B.Diploid (2n) and Triploid (3n)
C.Haploid (n) and Diploid (2n)
D.Triploid (3n) and Haploid (n)
Explanation: The functional megaspore is produced via meiosis of the megaspore mother cell and is haploid (n). The primary endosperm nucleus (PEN) is formed by triple fusion of one haploid male gamete with the diploid secondary nucleus (two polar nuclei), making it triploid (3n).
3In human females, at which stage of cell division are primary oocytes arrested until puberty?
A.Diplotene stage of Prophase I
B.Metaphase II
C.Anaphase I
D.Telophase II
Explanation: Primary oocytes begin meiotic division during embryonic development but remain temporarily suspended in the diplotene stage of prophase I. They remain arrested at this stage until puberty, when hormonal changes trigger the resumption of meiosis.
4Which hormone surge directly triggers ovulation during the human menstrual cycle?
A.Luteinizing Hormone (LH)
B.Progesterone
C.Follicle Stimulating Hormone (FSH)
D.Oxytocin
Explanation: A rapid increase in LH levels, known as the LH surge, occurs around the mid-cycle (day 14). This rapid spike induces the rupture of the mature Graafian follicle and the release of the secondary oocyte into the fallopian tube.
5Which Assisted Reproductive Technology (ART) involves transferring an embryo up to 8 blastomeres directly into the Fallopian tube?
A.ZIFT (Zygote Intra Fallopian Transfer)
B.IUT (Intra Uterine Transfer)
C.GIFT (Gamete Intra Fallopian Transfer)
D.ICSI (Intrablastocyst Cytoplasmic Injection)
Explanation: In ZIFT, zygotes or early embryos having up to 8 blastomeres formed through in vitro fertilization are transferred directly into the fallopian tube. Embryos with more than 8 blastomeres are transferred into the uterus via IUT.
6What structural feature of the tapetum makes it vital for pollen grain development?
A.It is multi-nucleate and nourishes developing microspores
B.It provides mechanical support to the outer anther wall
C.It secretes nectar to attract insect pollinators
D.It undergoes meiosis to produce male gametes
Explanation: The tapetum is the innermost layer of the anther wall. Its cells have dense cytoplasm and often become multinucleate, providing essential nourishment to developing microspores and producing enzymes like callase as well as sporopollenin precursors.
7The tough outer wall of pollen grains, exine, is composed of which highly resistant organic substance?
A.Sporopollenin
B.Pectocellulose
C.Callose
D.Suberin
Explanation: The exine of pollen grains is made of sporopollenin, one of the most resistant biological materials known. It resists high temperatures, strong acids, and alkali, protecting the male gametophyte from environmental degradation.
8Which organelle in sperm contains hydrolytic enzymes essential for penetrating the zona pellucida of an egg?
A.Acrosome
B.Axoneme
C.Mitochondrial spiral
D.Centriole
Explanation: The acrosome is a cap-like structure covering the anterior portion of the sperm head. Derived from the Golgi apparatus, it contains acrosomal enzymes (like hyaluronidase and acrosin) that dissolve the egg membranes during fertilization.
9In angiosperms, what is the fate of the synergids after double fertilization?
A.They degenerate soon after fertilization
B.They develop into the seed coat
C.They fuse to form the primary endosperm nucleus
D.They develop into the fruit wall
Explanation: Synergids direct the growth of the pollen tube into the embryo sac through the filiform apparatus. Once fertilization takes place, both synergids and antipodal cells degenerate.
10Which embryonic stage implants into the endometrium of the human uterus?
A.Blastocyst
B.Morula
C.Zygote
D.Gastrula
Explanation: The embryo reaches the uterus at the blastocyst stage (around day 5-7 post-fertilization). The outer trophoblast layer attaches to the endometrial lining, initiating implantation.

About the WBCHSE HS Biological Science Exam

Biological Science exam for class 12 students under West Bengal board. This OpenExamPrep bank is an English-language four-option MCQ study aid for WBCHSE Higher Secondary; it does not replace official Bengali/English board papers, descriptive answers, or required practical/project/performance evidence.

Assessment

WBCHSE Higher Secondary subject BIOS: Semesters I–IV across Classes XI–XII; theory examinations plus practical/project/performance where the syllabus requires them.

Time Limit

As per semester notification (typically 2–3 hours for theory sittings)

Passing Score

30% minimum in theory and in practical/project independently (WBCHSE examination FAQ)

Exam Fee

Semester enrolment fee structure (Council): Sem III/IV student total INR 215 (155 enrolment + 30 processing + 30 convenience), with INR 190 to Council and INR 25 centre grant; supplementary often INR 50/paper. Separately, the public Fees page lists Class XII examination fees (within schedule) about INR 205 lab / INR 195 non-lab / INR 135 special. Confirm the applicable circular for the sitting. (West Bengal Council of Higher Secondary Education (WBCHSE))

WBCHSE HS Biological Science Exam Content Outline

core

Exam Overview & Structure

Comprehensive overview of the West Bengal Higher Secondary (in-wbchse-hs-biological-science) examination covering key topics, marking scheme, and preparation strategies.

core

Syllabus Breakdown

Detailed unit-wise breakdown of the WBCHSE Class 11 and 12 curriculum for in-wbchse-hs-biological-science, aligned with official council guidelines.

core

Study Tips & Exam Strategy

Proven preparation strategies, time management guidelines, and practice routines to achieve top scores in Higher Secondary assessments.

How to Pass the WBCHSE HS Biological Science Exam

What You Need to Know

  • Passing score: 30% minimum in theory and in practical/project independently (WBCHSE examination FAQ)
  • Assessment: WBCHSE Higher Secondary subject BIOS: Semesters I–IV across Classes XI–XII; theory examinations plus practical/project/performance where the syllabus requires them.
  • Time limit: As per semester notification (typically 2–3 hours for theory sittings)
  • Exam fee: Semester enrolment fee structure (Council): Sem III/IV student total INR 215 (155 enrolment + 30 processing + 30 convenience), with INR 190 to Council and INR 25 centre grant; supplementary often INR 50/paper. Separately, the public Fees page lists Class XII examination fees (within schedule) about INR 205 lab / INR 195 non-lab / INR 135 special. Confirm the applicable circular for the sitting.

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

WBCHSE HS Biological Science Study Tips from Top Performers

1Focus on NCERT and board textbooks.
2Practice diagrams.
3Solve previous years' question papers.
4Revise genetics problems regularly.
5Understand concepts rather than memorizing.

Frequently Asked Questions

Are these MCQs identical to the official WBCHSE BIOS question paper?

No. Official non-language elective papers are set in Bengali and English under the semester system and may include descriptive and practical/project components. These items are an English MCQ study adaptation only.