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Class 11 Biology Chapter 2 MCQ. We covered all the Class 11 Biology Chapter 2 MCQ in this post for free so that you can practice well for the exam.
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Class 11 Biology Chapter 2 MCQ for Students
Which group of organisms lack a cell wall, can live in anaerobic conditions, and may cause diseases in animals and plants?
(A) Fungi
(B) Dinoflagellates
(C) Mycoplasma
(D) Archaebacteria
Option c – Mycoplasma
Prions are known to be the causative agents of which disease in humans?
(A) Cr-Jacob disease
(B) AIDS
(C) Herpes
(D) Bovine spongiform encephalopathy
Option a – Cr-Jacob disease
Triticum aestivum, a commonly grown crop, is classified under which group?
(A) Phylum Angiospermae
(B) Order Sapindales
(C) Class Dicotyledonae
(D) Both (A) and (C)
Option a – Phylum Angiospermae
Complete the analogy: Human : Hominidae :: Tiger :
(A) Canidae
(B) Carnivora
(C) Panthera
(D) Felidae
Option d – Felidae
Which among the following preserves living plant species for educational and research purposes?
(A) Museums
(B) Herbariums
(C) Botanical Gardens
(D) All of these
Option c – Botanical Gardens
Dogs and cats are part of the same
(A) Family
(B) Genus
(C) Order
(D) Species
Option c – Order
Choose the correct statement about viruses and viroids.
(A) Viruses infect but viroids are not infectious
(B) Viruses contain RNA only, while viroids have DNA
(C) Viruses have a protein shell; viroids lack such a structure
(D) Viruses cause potato spindle tuber, and viroids cause mosaic diseases
Option c – Viruses have a protein shell; viroids lack such a structure
Identify the one that does not belong to the group.
(A) Poales
(B) Felidae
(C) Sapindales
(D) Carnivora
Option b – Felidae
Which feature best defines living beings?
(A) Gaining mass
(B) Growth
(C) Cellular organization
(D) Reproduction
Option c – Cellular organization
In taxonomy, a family includes a group of related
(A) Order
(B) Genera
(C) Class
(D) Division
Option b – Genera
The common housefly is categorized under which family?
(A) Muscidae
(B) Hominidae
(C) Convolvulaceae
(D) Felidae
Option a – Muscidae
Pick the mismatched pair from the list below.
(A) Homo sapiens – Primata
(B) Musca domestica – Diptera
(C) Mangifera indica – Anacardiaceae
(D) Triticum aestivum – Poales
Option c – Mangifera indica – Anacardiaceae
What best supports the idea that awareness or consciousness is a unique trait of living organisms?
(A) All organisms possess self-awareness
(B) Living beings respond to environmental changes
(C) Brain-dead individuals blur the line between life and death
(D) This ability can be shown in non-living systems
Option b – Living beings respond to environmental changes
According to binomial nomenclature, the scientific name of the potato should be written as
(A) Solanum tuberosum
(B) Solanum tuberosum
(C) Solanum Tuberosum
(D) Solanum tuberosum
Option b – Solanum tuberosum
Choose the incorrect statement regarding Deuteromycetes.
(A) Their asexual and vegetative forms are known
(B) Their mycelium is aseptate and coenocytic
(C) They reproduce using conidia
(D) They are referred to as imperfect fungi
Option b – Their mycelium is aseptate and coenocytic
Which of the following is not true about heterotrophic bacteria?
(A) They help in converting milk into curd
(B) They fix atmospheric nitrogen in root nodules
(C) They are responsible for diseases such as typhoid and cholera
(D) They are categorized under kingdom Protista
Option d – They are categorized under kingdom Protista
Which group is identified as true bacteria?
(A) Archaebacteria
(B) Chrysophytes
(C) Eubacteria
(D) Euglenoids
Option c – Eubacteria
Complete the analogy: Trypanosoma : Flagellated Protozoa :: Paramoecium :
(A) Sporozoa
(B) Ciliated protozoa
(C) Amoeboid protozoa
(D) Slime mould
Option b – Ciliated protozoa
The major producers of oxygen and biomass in oceans are
(A) Dinoflagellates
(B) Diatoms
(C) Euglenoids
(D) Slime molds
Option b – Diatoms
The occurrence of red tides in marine waters is mainly due to
(A) Diatoms
(B) Dinoflagellates
(C) Desmids
(D) Mycoplasma
Option b – Dinoflagellates
A pond has a fish population of 200, and 100 die in one week due to toxins. What is the calculated death rate?
(A) 20 fish/week
(B) 0.5 fishes/week
(C) 50 fish/week
(D) 5.1 fishes/week
Option b – 0.5 fishes/week
Which of the following statements are accurate?
i. Species richness increases with area as per Humboldt’s observations.
ii. Rivet popper theory was proposed by Tilman.
iii. Robert May gave a realistic estimate of species count worldwide.
(A) i and iii are correct
(B) i, ii and iii are incorrect
(C) only ii and iii are correct
(D) i, ii and iii are correct
Option a – i and iii are correct
How is the energy pyramid typically represented?
(A) Always upright
(B) Always inverted
(C) Usually upright, sometimes inverted
(D) Never upright
Option a – Always upright
Identify the false statement among the following.
(A) Flattened stems in Opuntia carry out photosynthesis
(B) Seals have fat deposits beneath the skin to reduce heat loss
(C) As per Allen’s rule, desert mammals have reduced limbs and ears
(D) Kangaroo rats conserve water by excreting highly concentrated urine
Option c – As per Allen’s rule, desert mammals have reduced limbs and ears
Which of the following is not considered an invasive weed?
(a) Water hyacinth
(b) Lantana camara
(c) Parthenium
(d) Clarius gariepinus
Option d – Clarius gariepinus
The main natural source of sulfur in the environment is
(a) Seawater
(b) Rocks
(c) Fossil fuels
(d) Air
Option b – Rocks
During primary succession in an aquatic ecosystem, small phytoplankton are eventually succeeded by
(a) Marsh meadows
(b) Sedges
(c) Submerged rooted plants
(d) Grasses
Option c – Submerged rooted plants
Complete the analogy related to species interactions: Orchid Ophrys : Bees :: Whale :
(a) Calotropis
(b) Cattle egrets
(c) Sea anemone
(d) Barnacles
Option d – Barnacles
Assertion: Sparrows occupy multiple trophic levels within a food web.
Reason: They act as primary consumers when feeding on seeds and fruits and as secondary consumers when feeding on insects.
(a) Both statements are true, and the reason explains the assertion
(b) Both statements are true, but the reason does not explain the assertion
(c) The assertion is true, but the reason is false
(d) Both statements are false
Option a – Both statements are true, and the reason explains the assertion
Which of the following groups includes only extinct species?
(a) Dodo, Stellar’s sea cow, Clouded leopard
(b) Great Indian Bustard, Dodo, Quagga
(c) Tasmanian tiger, Stellar’s sea cow, Quagga
(d) Asiatic lion, Great Indian Bustard, Clouded leopard
Option c – Tasmanian tiger, Stellar’s sea cow, Quagga
The principle stating that two species competing for identical resources cannot coexist indefinitely was proposed by
(a) G.F. Gause
(b) Herbert Boyer
(c) Stanley Cohen
(d) Charles Darwin
Option a – G.F. Gause
The global summit on sustainable development held in Johannesburg, South Africa, took place in
(a) 1965
(b) 1972
(c) 1992
(d) 2002
Option d – 2002
Evaluate the following:
Statement I: Fine particulate matter (2.5 microns or smaller) can cause respiratory issues.
Statement II: Vehicles equipped with catalytic converters emit high levels of toxic gases.
(a) I is true, II is false
(b) I is false, II is true
(c) Both I and II are true
(d) Both I and II are false
Option a – I is true, II is false
Based on the signs of species interactions (+ for benefit, – for harm), which match is incorrect?
(a) Competition: – and –
(b) Mutualism: + and +
(c) Amensalism: + and –
(d) Parasitism: + and –
Option c – Amensalism: + and –
Choose the incorrect association:
(a) High BOD – Less polluted water
(b) Algal blooms – Reduced water quality and fish deaths
(c) High DDT levels – Decrease in bird populations due to biomagnification
(d) Increase in greenhouse gases – Global warming
Option a – High BOD – Less polluted water
The gradual nutrient enrichment and aging of a lake is called
(a) Biomagnification
(b) Eutrophication
(c) Bioremediation
(d) Biofortification
Option b – Eutrophication
The National Forest Policy (1988) of India suggests that forest coverage in plains should be
(a) 10%
(b) 21%
(c) 33%
(d) 67%
Option c – 33%
What is polyblend?
(a) A fine powder made from recycled modified plastic
(b) A compost mix of biodegradable waste and vermicompost
(c) A combination of plastic waste and tar
(d) A powder form of non-recyclable plastic
Option a – A fine powder made from recycled modified plastic
Choose the correct statements:
i. Ozone found at ground level is beneficial.
ii. The Montreal Protocol was aimed at controlling substances that deplete ozone.
iii. The Dobson unit measures the thickness of the ozone layer.
iv. Ozone loss results in reduced UV exposure on Earth.
(a) i and ii are correct
(b) ii and iii are incorrect
(c) iii and iv are correct
(d) i and iv are incorrect
Option d – i and iv are incorrect
The Red Data Book maintained by the IUCN includes information about
(a) Exotic plant species
(b) Species facing extinction risk
(c) Extinct animal species
(d) Commercially useful animals
Option b – Species facing extinction risk
The most commonly used device to remove particulate pollutants from power plant emissions is the
(a) Lime spray
(b) Electrostatic precipitator
(c) Smelter
(d) Smokestack
Option b – Electrostatic precipitator
Which molecule determines the structure and functioning of living beings?
(a) RNA
(b) DDT
(c) DNA
(d) CNA
Option c – DNA
Tetracycline is commonly used to treat
(a) Cholera
(b) Typhoid
(c) Tuberculosis
(d) Plague
Option d – Plague
Who was the inventor of Tetracycline?
(a) Y. Naidamma
(b) Y. Subba Rao
(c) Louis Pasteur
(d) Aristotle
Option b – Y. Subba Rao
Who is famously known as the “Wizard of Wonder Drugs”?
(a) Ronald Ross
(b) M.S. Swaminathan
(c) Y. Subba Rao
(d) H.C. Crick
Option c – Y. Subba Rao
The study of birds and their behaviors is called
(a) Microbiology
(b) Ornithology
(c) Cryptology
(d) Biotechnology
Option d – Biotechnology
Who played a key role in initiating the Green Revolution in India?
(a) Y. Subba Rao
(b) Y. Naidamma
(c) M.S. Swaminathan
(d) Salim Ali
Option c – M.S. Swaminathan
Har Gobind Khorana is renowned for his contributions in which scientific field?
(a) Biomedicine
(b) Biotechnology
(c) Biometrics
Research in the area of cell biology is primarily conducted at
(a) NIN
(b) CCMB
(c) Both of the above
(d) None of the above
Option b – CCMB
Which institute is known for conducting research in human nutrition?
(a) Indian Agricultural Research Institute
(b) National Institute of Nutrition
(c) National Institute of Oceanography
(d) None of the above
Option b – National Institute of Nutrition
The institution involved in studies related to medical sciences is
(a) IARI
(b) NIN
(c) CMR
(d) All of the above
Option c – CMR
Where is the International Crops Research Institute for the Semi-Arid Tropics (ICRISAT) located?
(a) Hyderabad
(b) Pune
(c) Delhi
(d) Jaipur
Option a – Hyderabad
The National Botanical Research Institute (NBRI) focuses its studies on
(a) Animals
(b) Plants
(c) Eggs
(d) Fishes
Option b – Plants
The interdisciplinary branch combining biology and chemistry is known as
(a) Biochemistry
(b) Anatomy
(c) Pathology
(d) Ecology
Option a – Biochemistry
Which biological discipline focuses on heredity and genetic traits?
(a) Anatomy
(b) Genetics
(c) Ecology
(d) Taxonomy
Option b – Genetics
The field of biology that investigates fossils is known as
(a) Ecology
(b) Genetics
(c) Palaeontology
(d) All of the above
Option c – Palaeontology
Microorganisms like bacteria and viruses are studied under
(a) Ecology
(b) Genetics
(c) Anatomy
(d) Microbiology
Option d – Microbiology
The study of the global distribution of animals falls under
(a) Pathology
(b) Zoogeography
(c) Anatomy
(d) All of the above
Option b – Zoogeography
Sponges are classified under which phylum?
(a) Chordata
(b) Protozoa
(c) Porifera
(d) Metaphyta
Option c – Porifera
Diatoms are part of which phylum?
(a) Chlorophyta
(b) Metaphyta
(c) Metazoa
(d) Bryophyta
Option a – Chlorophyta
Insects are categorized under the phylum
(a) Insecta
(b) Arthropoda
(c) Annelida
(d) Chordata
Option b – Arthropoda
Amoebic dysentery is caused by which organism?
(a) Bacteria
(b) Protozoa
(c) Virus
(d) Fungi
Option b – Protozoa
What is the typical incubation period for whooping cough?
(a) 1–10 days
(b) 32–64 days
(c) 10–16 days
(d) 16–33 days
Option c – 10–16 days
Which of the following is not caused by bacteria? ( Class 11 Biology MCQ )
(a) Cholera
(b) Mumps
(c) Tetanus
(d) Typhoid
Option b – Mumps
Tetanus is commonly referred to as
(a) Lockjaw
(b) Diphtheria
(c) Both
(d) None
Option a – Lockjaw
The most cost-effective way to make drinking water safe is ( Class 11 Biology MCQ )
(a) Boiling
(b) Chlorination
(c) Filtration
(d) All of the above
Option c – Filtration
Which of the following can pollute water sources?
(a) Bathing
(b) Washing clothes
(c) Washing livestock
(d) All of the above
Option d – All of the above
Plants like Drosera and Nepenthes help control mosquito populations because they are ( Class 11 Biology MCQ )
(a) Insectivorous
(b) Aquatic
(c) Medicinal
(d) Parasitic
Option a – Insectivorous
Which fish is commonly used to biologically control mosquito larvae?
(a) Gambusia
(b) Labeo
(c) Panchax
(d) Any of these
Option d – Any of these
How can animals spread infectious diseases?
(a) Through undercooked meat
(b) Via snails
(c) Through insects
(d) Any of the above
Option d – Any of the above
Which disease can be transmitted by direct physical contact? ( Class 11 Biology MCQ )
(a) Scabies
(b) Polio
(c) Cholera
(d) Typhoid
Option a – Scabies
The disease amoebiasis primarily spreads through
(a) Contaminated water
(b) Air
(c) Animals
(d) Skin contact
Option a – Contaminated water
Flies are known to spread diseases such as ( Class 11 Biology MCQ )
(a) Cholera
(b) Malaria
(c) Filaria
(d) Scabies
Option a – Cholera
Snails help spread which of the following parasitic infections?
(a) Planaria
(b) Blood fluke
(c) Liver fluke
(d) None of these
Option c – Liver fluke
How long should water be boiled to eliminate harmful germs?
(a) 10–15 minutes
(b) 9 minutes
(c) 5 minutes
(d) 7 minutes
Option a – 10–15 minutes
The discovery of vaccination dates back to the year ( Class 11 Biology MCQ )
(a) 1786
(b) 1756
(c) 1776
(d) 1886
Option c – 1776
The outer surface of microorganisms contains
(a) Plasma
(b) Antigens
(c) Antibodies
(d) Serum
Option b – Antigens
What protein is produced by the body in response to an antigen? ( Class 11 Biology MCQ )
(a) Antibodies
(b) Antigens
(c) Plasma
(d) Serum
Option a – Antibodies
To stimulate antibody production, which substance is introduced into the body?
(a) Vaccine
(b) Antigen
(c) Serum
(d) Antibody
Option a – Vaccine
DDT is used for controlling pests such as ( Class 11 Biology MCQ )
(a) Powder beetles
(b) Flies and cockroaches
(c) Both of the above
(d) None
Option b – Flies and cockroaches
The invention of vaccination is credited to
(a) Pasteur
(b) Fenner
(c) Both
(d) None
Option b – Fenner
Chemicals designed to kill fungi are known as ( Class 11 Biology MCQ )
(a) Fungicides
(b) Rodenticides
(c) Both
(d) None
Option a – Fungicides
Vaccines are typically prepared using
(a) Serum
(b) Blood
(c) Inactivated microorganisms
(d) All of the above
Option c – Inactivated microorganisms
Mosquitoes serve as vectors for which diseases? ( Class 11 Biology MCQ )
(a) Malaria
(b) Filaria
(c) Both
(d) None
Option c – Both
Which type of cell plays a major role in natural immunity?
(a) Digestive cells
(b) Red blood cells
(c) White blood cells
(d) Kidney cells
Option c – White blood cells
Ethylene dibromide is used primarily to eliminate ( Class 11 Biology MCQ )
(a) Insects
(b) Rats
(c) Cats
(d) Dogs
Option a – Insects
Which method helps retain the freshness of vegetables for longer?
(a) Freezing
(b) Smoking
(c) Filtering
(d) Dehydration
Option a – Freezing
After pasteurization, milk should be stored at ( Class 11 Biology MCQ )
(a) 40°C
(b) 30°C
(c) 10°C
(d) 20°C
Option c – 10°C
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