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100+ Free BCS Written Botany Practice Questions

Prepare for the BCS Written Post-Related Botany, Subject Code 581 exam with instant access — no signup required.

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Key Facts: BCS Written Botany Exam

581

BPSC subject code for post-related Botany

Official BCS written syllabus

200 marks

Post-related Botany paper (Part I 100 + Part II 100)

Official BCS written syllabus

4 hours

Duration used for BPSC 200-mark written papers (confirm routine)

BPSC sitting practice

50% aggregate

Written-stage pass on the 900-mark written examination

BPSC BCS examination page

Tk. 200 / Tk. 50

50th BCS application fee (general / reduced categories); no separate written fee

50th BCS circular reporting; confirm live circular

Descriptive

Official item type (this bank is an English MCQ study adaptation)

BPSC written syllabus

BCS Botany (code 581) is a 200-mark, 4-hour descriptive written paper (Part I 100 + Part II 100) for technical/professional or dual-cadre candidates. Written pass is 50% aggregate on 900 marks, plus any per-paper minima BPSC sets. Application fee is Tk. 200 general / Tk. 50 reduced categories (50th BCS) with no separate written fee. This page offers English MCQs as a study aid, not an official-paper simulation.

Sample BCS Written Botany Practice Questions

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

1Tobacco mosaic virus (TMV), the syllabus example of a simple RNA virus, has which genome and capsid architecture?
A.Positive-sense single-stranded RNA in a rigid helical rod
B.Circular single-stranded RNA with no protein coat
C.Negative-sense segmented RNA in an enveloped spherical particle
D.Double-stranded DNA in an icosahedral head with a contractile tail
Explanation: TMV is a positive-sense ssRNA plant virus whose coat protein subunits assemble into a hollow helical rod about 300 nm long. That simple helical RNA virion is the BPSC contrast with DNA bacteriophage T2.
2Bacteriophage T2, the syllabus DNA-virus example, infects which host and packages which nucleic acid?
A.Escherichia coli; linear double-stranded DNA
B.Nicotiana tabacum; positive-sense RNA
C.Bacillus subtilis; single-stranded DNA plasmid
D.Chlorella cells; double-stranded RNA
Explanation: T2 is a T-even lytic bacteriophage of E. coli. Its genome is linear dsDNA packed in an icosahedral head attached to a contractile tail that injects DNA through the bacterial wall.
3Which pair correctly distinguishes a prion from a viroid?
A.Prion: infectious protein with no nucleic acid; viroid: circular ssRNA with no capsid
B.Prion: DNA virus of bacteria; viroid: RNA virus of plants
C.Prion: helical RNA virion; viroid: tailed DNA phage
D.Prion: satellite RNA needing a helper virus; viroid: complete enveloped virion
Explanation: Prions are proteinaceous infectious particles (misfolded PrP) lacking nucleic acid. Viroids are small unencapsidated circular ssRNA molecules that infect plants (for example potato spindle tuber viroid).
4Photosynthesis in purple and green sulphur bacteria is typically:
A.Anoxygenic, using bacteriochlorophyll and electron donors such as H2S rather than water
B.Identical to the C4 Hatch–Slack pathway of maize leaves
C.Restricted to nitrogenase in heterocysts
D.Oxygenic, using water as the electron donor and chlorophyll a only
Explanation: Anoxygenic phototrophs use bacteriochlorophylls and usually reduced sulphur compounds or organic donors, so they do not evolve O2. Oxygenic photosynthesis with water and chlorophyll a is the cyanobacterial/plant pattern.
5In bacteria, transformation is best defined as:
A.Uptake of naked DNA from the environment by a competent cell
B.Direct cell-to-cell transfer of a conjugative plasmid through a pilus
C.Fusion of two protoplasts to form a somatic hybrid
D.Gene transfer by a bacteriophage packaging bacterial DNA
Explanation: Transformation is competence-dependent uptake of free DNA, classically shown by Griffith’s pneumococcus work and Avery’s DNA proof. It is distinct from transduction (phage) and conjugation (direct plasmid transfer).
6Transduction in bacteria is gene transfer that requires:
A.A bacteriophage as the DNA vehicle
B.A sex pilus and an F plasmid only
C.Heat-killed donor cells releasing lipid A
D.Meiosis inside an endospore
Explanation: In transduction, a phage accidentally packages bacterial DNA (generalised) or excises flanking host genes (specialised, as in lambda). Zinder and Lederberg demonstrated it in Salmonella. No pilus is required.
7Which economic use is correctly matched to the microbe?
A.Rhizobium — symbiotic N2 fixation in legume root nodules
B.Clostridium botulinum — commercial penicillin fermentation
C.Agrobacterium tumefaciens — alcoholic fermentation of molasses
D.Nitrosomonas — lactic acid fermentation of milk
Explanation: Rhizobium (and related rhizobia) infect legumes, form nodules, and reduce N2 via nitrogenase, a core agricultural use of microbes. The other pairings mix up antibiotic, fermentation, and nitrification organisms.
8Modern classification of fungi is based primarily on which combination of characters?
A.Molecular phylogeny plus sexual structures, spore types, and cell-wall chemistry (chitin)
B.Bacteriochlorophyll absorption peaks only
C.The presence or absence of a nucleus
D.Flower colour and number of stamens
Explanation: Kingdom Fungi is delimited by chitinous walls, heterotrophy, and phylogeny (Chytridiomycota, Zygomycota s.l./Mucoromycota, Glomeromycota, Ascomycota, Basidiomycota). Classical keys still use zygospores, asci, and basidia, now tested against DNA.
9Which statement correctly illustrates economic importance of fungi?
A.Saccharomyces cerevisiae ferments sugars to ethanol and CO2 used in baking and brewing
B.All fungi are obligate plant pathogens with no industrial use
C.Agaricus is the principal source of streptomycin
D.Fungi lack enzymes that decompose lignin or cellulose
Explanation: Yeasts underpin baking, brewing, and ethanol; other fungi yield antibiotics (Penicillium), organic acids, mycorrhizae, and edible mushrooms, while some are pathogens or spoilers. That dual benefit/harm is the usual essay frame.
10A plant disease, in the pathological sense used in the BCS syllabus, is caused by:
A.A sustained disturbance of normal function produced by a pathogen or persistent abiotic factor
B.A single day of wilting that recovers at night with no agent
C.The presence of chloroplasts in mesophyll
D.Any visible insect hole, whether or not function is impaired
Explanation: Disease is a malfunctioning process, not merely a symptom. Biotic causes (fungi, oomycetes, bacteria, viruses, nematodes) and abiotic stresses (nutrient, drought, toxin) both qualify when they persistently impair physiology.

About the BCS Written Botany Exam

BCS Written Post-Related Botany (subject code 581) is the 200-mark technical/professional paper for candidates whose cadre (or dual-cadre choice) requires botany. The official BPSC syllabus splits 100 marks on plant diversity—microbes, fungi and plant pathology, algae, bryophytes and pteridophytes, angiosperm systematics, anatomy, and embryology—and 100 marks on physiology, biochemistry, cytology, genetics, tissue culture, horticulture, ethnobotany, and ecology, including Bangladesh forests and environmental hazards. The live paper is descriptive. This free bank is an English-language MCQ study adaptation of that syllabus, not an official translation, format simulation, or substitute for writing practice.

Assessment

Subject code 581, 200 marks in two parts of 100 marks each. Part I: plant diversity (morphology, anatomy, reproduction — microbiology through embryology of angiosperms, including named crop diseases). Part II: functions and applications (physiology and biochemistry, cytology, genetics, tissue culture, horticulture, ethnobotany, ecology). Official format is descriptive (short and long answers). This bank is an English-language MCQ study adaptation, not an official translation or format simulation.

Time Limit

4 hours for the 200-mark written paper (confirm the current BPSC routine)

Passing Score

50% aggregate on the 900-mark written examination (BPSC page); per-paper minima also apply as set by BPSC

Exam Fee

Tk. 200 general (50th BCS); Tk. 50 for ethnic-minority, persons-with-disabilities, and third-gender applicants; no separate written or viva fee (confirm the live circular) (Bangladesh Public Service Commission (BPSC))

BCS Written Botany Exam Content Outline

Part I (100/200)

Microbiology

TMV and T2 phage structure, multiplication and transmission; prions and viroids; bacterial classification, reproduction, photosynthesis, transformation and transduction; economic importance of microbes.

Part I (100/200)

Mycology and plant pathology

Modern fungal classification; economic fungi; disease concepts, development stages, and control; blast of rice, stem rust of wheat, late blight of potato, stem rot of jute, red rot of sugarcane, rice tungro, and Panama disease of banana.

Part I (100/200)

Phycology

Modern algal classification, characters of major divisions, range of vegetative structure, and phytoplankton biology and economic importance.

Part I (100/200)

Higher cryptogams, angiosperm taxonomy, anatomy, and embryology

Bryophyte and pteridophyte features and Bangladesh examples; ICN, chemo- and cytotaxonomy, classification systems, herbaria; steles, vascular tissues, meristems; mega- and micro-sporogenesis/gametogenesis and embryo-sac types.

Part II (100/200)

Plant physiology and biochemistry

C3, C4 and CAM photosynthesis; glycolysis, aerobic respiration and alcoholic fermentation; nitrogen fixation; salt absorption; dormancy, photoperiodism and vernalization; sucrose, starch and cellulose biosynthesis; alkaloids and fatty acids.

Part II (100/200)

Cytology, genetics, and tissue culture

Chromosome structure, karyotype and aberrations; Mendel, sex determination, DNA/RNA, plasmids, rDNA and crop genetic engineering; cell suspension, somatic embryogenesis, haploids, and clonal propagation.

Part II (100/200)

Horticulture, ethnobotany, and ecology

Fertilizer classes and horticultural PGRs; ethnobotanical research and medicinal-plant conservation in Bangladesh; vegetation methods, pond ecosystems, pollution and dams, primary production, environmental hazards, and forest types and depletion in Bangladesh.

How to Pass the BCS Written Botany Exam

What You Need to Know

  • Passing score: 50% aggregate on the 900-mark written examination (BPSC page); per-paper minima also apply as set by BPSC
  • Assessment: Subject code 581, 200 marks in two parts of 100 marks each. Part I: plant diversity (morphology, anatomy, reproduction — microbiology through embryology of angiosperms, including named crop diseases). Part II: functions and applications (physiology and biochemistry, cytology, genetics, tissue culture, horticulture, ethnobotany, ecology). Official format is descriptive (short and long answers). This bank is an English-language MCQ study adaptation, not an official translation or format simulation.
  • Time limit: 4 hours for the 200-mark written paper (confirm the current BPSC routine)
  • Exam fee: Tk. 200 general (50th BCS); Tk. 50 for ethnic-minority, persons-with-disabilities, and third-gender applicants; no separate written or viva fee (confirm the live circular)

Keys to Passing

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

BCS Written Botany Study Tips from Top Performers

1Write disease-cycle answers for all seven named diseases (blast, stem rust, late blight, jute stem rot, red rot, tungro, Panama) with causal agent, symptoms, survival, and control—not only the organism name.
2Compare C3, C4, and CAM in a table (first product, enzyme, anatomy, stomatal timing, photorespiration) so you can drop it into a 10-mark physiology question.
3For Bangladesh ecology, name forest types and processes (Sundarbans mangrove, Madhupur sal, CHT evergreen, homestead forests, polder waterlogging, coastal salinity). Do not invent unpublished species counts.
4Practise ICN, Bentham and Hooker versus phylogenetic systems, and the role of the Bangladesh National Herbarium—taxonomy essays reward precise terms.
5Use these MCQs to check facts, then outline 15–20 mark descriptive answers under timed conditions; the live paper is not multiple choice.

Frequently Asked Questions

What is BCS Written Post-Related Botany?

It is the 200-mark post-related written paper (subject code 581) in the BCS written stage for technical/professional-cadre and dual-cadre candidates. BPSC splits it into Part I (plant diversity, 100 marks) and Part II (functions and applications, 100 marks).

Is the official Botany paper multiple choice?

No. The official BPSC paper is a descriptive written examination (short and long answers). This bank is an English-language MCQ study adaptation of the syllabus, not an official translation, format simulation, or substitute for writing practice.

How are the 200 marks divided?

The official syllabus assigns 100 marks to Part I (morphology, anatomy and reproduction, including microbiology through embryology) and 100 marks to Part II (physiology, genetics, tissue culture, horticulture, ethnobotany, and ecology).

Who has to sit the Botany paper?

General-cadre candidates sit compulsory papers only. The extra 200-mark post-related subject is for technical/professional cadres and for dual-cadre applicants who choose a cadre that requires it. Confirm your cadre list on the circular.

What is the written pass standard?

BPSC’s published page requires 50% aggregate on the 900-mark written examination. Per-paper minima may also apply as set by BPSC; check the circular for the cycle you are sitting.

Is there a separate fee for the written Botany paper?

No. The 50th BCS application fee is Tk. 200 for general candidates and Tk. 50 for specified reduced categories, paid via Teletalk, and covers preliminary, written, and viva. Confirm the live circular.

How long is the Botany written paper?

BPSC 200-mark written papers on this site follow a 4-hour sitting. Always confirm the timetable on the current BPSC written routine.

In what language is this practice bank?

This bank is an original English-language MCQ study adaptation of the official BPSC Botany syllabus. It is not an official BPSC paper or a translation of a past script. Use it to lock facts, then practise full descriptive answers.