Chapter 2: Biological Classification – MCQs with Answers & Explanations
CBSE Class 11 Biology MCQs with Answers & Explanations – Chapter 2: Biological Classification (NCERT Based)
Course Details
Course: CBSE Class 11 Biology
Syllabus: NCERT
Unit: Unit I – Diversity in Living World
Chapter: Chapter 2 – Biological Classification
CBSE Board Examination: Central Board of Secondary Education – Class 11 (School & Annual Examinations)
CBSE Class 11 Biology Chapter 2 Biological Classification – 40 MCQs with Answers & Explanations (NCERT)
Section A: Five Kingdom Classification (MCQs 1–10)
- The Five Kingdom Classification was proposed by:
A. Aristotle
B. Linnaeus
C. R.H. Whittaker
D. Darwin
Correct Answer: C
Explanation: R.H. Whittaker proposed the Five Kingdom Classification in 1969. - Which criterion is NOT used in Whittaker’s classification?
A. Cell structure
B. Mode of nutrition
C. Habitat
D. Phylogeny
Correct Answer: C
Explanation: Habitat alone is not a criterion; structural and evolutionary features are considered. - Which kingdom includes prokaryotic organisms?
A. Protista
B. Monera
C. Fungi
D. Plantae
Correct Answer: B
Explanation: Monera consists of prokaryotic organisms without a true nucleus. - Unicellular eukaryotes are placed under:
A. Monera
B. Fungi
C. Protista
D. Animalia
Correct Answer: C
Explanation: Protista includes unicellular eukaryotic organisms. - Which kingdom shows absorptive heterotrophic nutrition?
A. Plantae
B. Animalia
C. Fungi
D. Protista
Correct Answer: C
Explanation: Fungi absorb nutrients from organic matter. - Which kingdom includes multicellular autotrophs?
A. Protista
B. Monera
C. Plantae
D. Animalia
Correct Answer: C
Explanation: Plantae are multicellular autotrophs with chlorophyll. - Viruses are excluded from Five Kingdom Classification because they are:
A. Multicellular
B. Prokaryotic
C. Acellular
D. Autotrophic
Correct Answer: C
Explanation: Viruses lack cellular organisation. - Which kingdom includes ingestive heterotrophs?
A. Fungi
B. Protista
C. Animalia
D. Plantae
Correct Answer: C
Explanation: Animals ingest and digest food internally. - Which classification system reflects evolutionary relationships?
A. Artificial
B. Natural
C. Phylogenetic
D. Numerical
Correct Answer: C
Explanation: Phylogenetic classification is based on evolution. - Which kingdom shows the simplest organisation?
A. Protista
B. Fungi
C. Monera
D. Animalia
Correct Answer: C
Explanation: Monera includes the simplest prokaryotic organisms.
Section B: Kingdom Monera (MCQs 11–18)
- Cell wall of bacteria is made of:
A. Cellulose
B. Chitin
C. Peptidoglycan
D. Silica
Correct Answer: C
Explanation: Peptidoglycan provides rigidity to bacterial cell walls. - Mode of reproduction in bacteria is mainly:
A. Budding
B. Binary fission
C. Spore formation
D. Fragmentation
Correct Answer: B
Explanation: Bacteria reproduce asexually by binary fission. - Photosynthetic prokaryotes are called:
A. Algae
B. Cyanobacteria
C. Fungi
D. Protozoa
Correct Answer: B
Explanation: Cyanobacteria are photosynthetic bacteria. - Which organism lacks a cell wall?
A. Nostoc
B. E. coli
C. Mycoplasma
D. Anabaena
Correct Answer: C
Explanation: Mycoplasma lacks a cell wall. - Nitrogen fixation is carried out by:
A. Fungi
B. Cyanobacteria
C. Viruses
D. Protozoa
Correct Answer: B
Explanation: Cyanobacteria fix atmospheric nitrogen. - Which bacteria derive energy from chemical reactions?
A. Photosynthetic
B. Saprophytic
C. Chemosynthetic
D. Parasitic
Correct Answer: C
Explanation: Chemosynthetic bacteria use chemical energy. - Bacteria are considered ubiquitous because they:
A. Live only in soil
B. Live only in water
C. Occur in all habitats
D. Are parasites
Correct Answer: C
Explanation: Bacteria are found in diverse environments. - Which is the smallest living cell?
A. Virus
B. Mycoplasma
C. Amoeba
D. Euglena
Correct Answer: B
Explanation: Mycoplasma is the smallest free-living cell.
Section C: Kingdom Protista & Fungi (MCQs 19–28)
- Protists are primarily:
A. Terrestrial
B. Aquatic
C. Parasitic
D. Aerial
Correct Answer: B
Explanation: Most protists live in aquatic habitats. - Locomotion in protozoans occurs by:
A. Roots
B. Wings
C. Cilia or pseudopodia
D. Hyphae
Correct Answer: C
Explanation: Protozoans use cilia, flagella, or pseudopodia. - Siliceous cell walls are found in:
A. Euglena
B. Amoeba
C. Diatoms
D. Fungi
Correct Answer: C
Explanation: Diatoms have silica-rich walls. - Fungal cell wall is composed of:
A. Cellulose
B. Peptidoglycan
C. Chitin
D. Silica
Correct Answer: C
Explanation: Chitin strengthens fungal cell walls. - Vegetative body of fungi is called:
A. Thallus
B. Mycelium
C. Rhizoid
D. Sporophyte
Correct Answer: B
Explanation: Mycelium consists of interconnected hyphae. - Yeast belongs to:
A. Phycomycetes
B. Ascomycetes
C. Basidiomycetes
D. Deuteromycetes
Correct Answer: B
Explanation: Yeast is an ascomycete fungus. - Penicillin is produced by:
A. Rhizopus
B. Agaricus
C. Penicillium
D. Aspergillus
Correct Answer: C
Explanation: Penicillium produces penicillin. - Fungi reproduce mainly by:
A. Seeds
B. Spores
C. Buds
D. Eggs
Correct Answer: B
Explanation: Spore formation is common in fungi. - Which fungi are called imperfect fungi?
A. Ascomycetes
B. Basidiomycetes
C. Phycomycetes
D. Deuteromycetes
Correct Answer: D
Explanation: Sexual reproduction is not observed in Deuteromycetes. - Fungi act as important:
A. Producers
B. Consumers
C. Decomposers
D. Parasites only
Correct Answer: C
Explanation: Fungi decompose organic matter.
Section D: Plantae, Animalia, Viruses & Lichens (MCQs 29–40)
- Plants are autotrophic because they:
A. Absorb food
B. Ingest food
C. Synthesize food
D. Depend on animals
Correct Answer: C
Explanation: Plants synthesize food by photosynthesis. - Plant cell wall is made of:
A. Chitin
B. Peptidoglycan
C. Cellulose
D. Silica
Correct Answer: C
Explanation: Cellulose provides rigidity to plant cells. - Animals differ from plants by absence of:
A. Nucleus
B. Chlorophyll
C. Cell wall
D. Cytoplasm
Correct Answer: C
Explanation: Animal cells lack cell walls. - Animals are called ingestive heterotrophs because they:
A. Absorb food
B. Synthesize food
C. Ingest solid food
D. Photosynthesise
Correct Answer: C
Explanation: Animals ingest and digest food internally. - Viruses contain:
A. Only DNA
B. Only RNA
C. Both DNA and RNA
D. DNA or RNA
Correct Answer: D
Explanation: Viruses contain either DNA or RNA. - Viruses are obligate parasites because they:
A. Have cell walls
B. Reproduce independently
C. Multiply only inside host cells
D. Are multicellular
Correct Answer: C
Explanation: Viruses require host machinery. - Viroids differ from viruses because they:
A. Have protein coats
B. Infect animals
C. Lack protein coats
D. Are multicellular
Correct Answer: C
Explanation: Viroids are naked RNA molecules. - Potato spindle tuber disease is caused by:
A. Virus
B. Viroid
C. Bacteria
D. Fungus
Correct Answer: B
Explanation: It is caused by viroids. - Lichens are a symbiotic association between:
A. Algae and bacteria
B. Fungi and bacteria
C. Algae and fungi
D. Virus and algae
Correct Answer: C
Explanation: Lichens consist of algae and fungi. - In lichens, algae are responsible for:
A. Protection
B. Absorption
C. Photosynthesis
D. Reproduction
Correct Answer: C
Explanation: Algae prepare food. - Lichens are indicators of:
A. Water pollution
B. Soil fertility
C. Air pollution
D. Noise pollution
Correct Answer: C
Explanation: Lichens are sensitive to air pollutants. - Which group shows characters of two different kingdoms?
A. Viruses
B. Lichens
C. Fungi
D. Protists
Correct Answer: B
Explanation: Lichens show algal and fungal characteristics.
Exam Relevance
✔ Strictly NCERT-aligned
✔ Ideal for CBSE Class 11 MCQ-based assessments
✔ Concept-clearing explanations included
✔ Strong focus on classification logic