MCQ Biology - Learning Biology through MCQs

Biology Multiple Choice Questions and Answers for Different Competitive Exams

Multiple Choice Questions on Membrane Transport MCQ

1. Gases such as oxygen and carbon dioxide cross the cell membrane by
a) passive diffusion through the lipid bilayer
b) primary active transport
c) specific gas transport proteins
d) secondary active transport

2.Carrier proteins are take part in
a)Water transport
b)Active transport of ions
c)Passive transport of ions
d)None of these


3. Which of the following is an example of primary active transport?
a)Cl--HCO3- exchange
b)Na+ K+ ATPase
c)Na+ - H+ exchange
d)Na+-Ca2+ exchange
4. The principal intracellular cation is:
a)Na+
b)Ca+
c)K+
d)Cl-
5. The sodium pump
a)Exchanges extracellular Na+ for intracellular K+
b)Is an ion channel
c)Is important for maintaining a constant cell volume
d)Can only be inhibited by metabolic poisons
6.  Which of the following values is closest to the resting membrane potential of mammalian cells:
a)+20 mV
b)-20 mV
c)-60 mV
d)+60 mV
Multiple Choice Questions on Membrane Transport (MCQ  on Membrane Transport )
7. Which of the following statements regarding exocytosis is correct?
a)Is always employed by cells for secretion
b)Takes up large molecules from the extracellular space
c)Allows the retrieval of elements of the cell membrane
d)Is used to deliver material into the extracellular space
8. Endocytosis is used by cells to:
a)Ingest bacteria and cell debris
b)Retrieve elements of the cell membrane after exocytosis
c)Secrete large molecules into the extracellular space
d)None of these
9.  Pinocytosis
a)At sites of membrane called coated pits.
b)For large  protein molecule
c)By formation   of pinocytic vesicle.
d)All of these

10. The resting membrane potential is mainly determined by:

a)the K+ gradient
b)the Cl- gradient
c)the Ca2+ gradient
d)the Na+ gradient
11. Which of the following process requires membrane proteins?
a)Pinocytosis
b)exocytosis
c)Phagocytosis
d)Receptor mediated endocytosis

12. Phagocytosis
a)Is preceded by opsonization
b)Requires presence of Ca2+ ions in extracellular fluid.
c)Occurs mainly in leucocytes
d)All of these

Learn more: 
Answers:
1.a) passive diffusion through the lipid bilayer
2. b)Active transport of ions
3. b)Na+ K+ ATPase
4. c)K+
5. c)Is important for maintaining a constant cell volume
6. c)-60 mV
7. d)Is used to deliver material into the extracellular space
8. b)Retrieve elements of the cell membrane after exocytosis
9. d)All of these
10. a)the K+ gradient
11. d)Receptor mediated endocytosis
12. d)All of these
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Botany Exam Questions (Plant science MCQ)

1. Match the following  (SET Botany, 2017)
List I (chemical compound)
List II (Function)
a. Chloramphenicol
1. Alternative electron donor to PS II
b. Reserpine
2. Mitochondrial inhibitor
c. Rotenone
3. Inhibits chloroplastic protein
d. Ascorbic acid
4. Antihypertensive drug

Choose the correct one:
A) a-1; b-3; c-2; d-4
B) a-3; b-4; c-2; d-1
C) a-2; b-3; c-4; d-1
D) a-4; b-2; c-3; d-1

2. During the course of prolonged starvation and fasting, glucose is synthesized from one of the following metabolic process. (SET Botany, 2017)
A) Glycogenesis
B) Glycolysis
C) Gluconeogenesis
D) Fermentation

3. In aroids a foul smell emanates at the time of the emergence of the inflorescence, which basically is due to alternative oxidation pathway. Arrange the various steps of the respective process and related events in appropriate order(SET Botany, 2017)
1. Volatilisation of indoles and sulphur compounds
2. Temperature generation
3. Oxygen is converted to water
4. Movement of electrons from Ubiquinone to alternate oxidase
A) 1,2,3,4
B) 4,3,2,1
C) 4,2,1,3
D) 4,1,2,3

4. Following are a few statements related to the mitochondrial electron transport in plants. Pick out the correct statements. (SET Botany, 2017)
1. NAD(P)H dehydrogenase complex facing intermebrane space facilitate oxidation of NAD(P)H
2. NAD(P)H dehydrogenase is sensitive to rotenone
3. Alternate oxidase supports cyanide resistant respiratory pathway
4. Terminal oxidase is sensitive to potassium cyanide
A) 1,2,3 only are correct
B) 2,3,4 only are correct
C) 1,3,4 only are correct
D) All are correct

5. In the water oxidizing clock which metal element functions as the pivotal component?(SET Botany, 2017)
A) Mg2+
B) Mn2+
C) Cu
D) Fe

6. What is meant by lichenometry? (SET Botany , 2017)
A) Study regarding the age of lichens.
B) Study of the age of exposed rock surfaces based on the size of lichen thalli.
C) Study regarding the calculation of the period in which lichens evolved.
D) Study regarding the succession of various forms of lichens

7. The pH indicator in the litmus test is a dye extracted from the lichen.(SET Botany, 2017)
Roccella tinctoria Litmus

A) Umbilicaria esculenta
B) Parmelia saxatilis
C) Roccella tinctoria
 D) Xanthoria parietina

8. State whether these statements are true or false.(SET Botany, 2017)
1. The acrocarpous mosses are generally those upright mosses with terminal sporangia.
2. Pleurocarpous mosses produce their sporangia on short, specialized lateral branches or buds and typically are prostrate.
3. Cladocarpous are those mosses that bear sporophytes terminally on short, lateral branches.
A) 1 and 2 only are correct
B) 2 and 3 only are correct
C) 1 and 3 only are correct
D) All are correct

9. Observe the following definitions and choose the correct ones?(SET Botany, 2017)
1. Virion is a complete virus particle, consisting of RNA/DNA surrounded by a protein shell and consisting the infective form of a virus.
2. Viroids consist solely of short strands of circular, single-stranded RNA without protein coats.
3. A retrovirus is an infectious agent composed entirely of protein material, called PrP.
A) 1 and 2 only are correct
B) 2 and 3 only are correct
C) 1 and 3 only are correct 
D) All are correct

10. Match the following (SET Botany, 2017)
Resin
Source Plant
p. Dammar gum
l. Ferula gummosa
q. Frankincense 
m. Boswellia sacra
r. Galbanum
n. Members of Dipterocarpaceae
s. Hashish
o. Cannabis indica
A) p-l,q-n, r-m, s-o
B) p-l, q-o, r-n. s-m
C) p-n, q-m, r-l, s-o
D) p-n, q-l, r-m, s-o
Answers
1. B) a-3; b-4; c-2; d-1
2. C) Gluconeogenesis
3. C) 4,2,1,3
4. C) 1,3,4 only are correct
5. B) Mn2+
6. B) Study of the age of exposed rock surfaces based on the size of lichen thalli.
7. C) Roccella tinctoria
8. D) All are correct
9. A) 1 and 2 only are correct
10. C) p-n, q-m, r-l, s-o
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Multiple Choice Questions on Water Pollution

1. Which of the following is the most harmful cause of oceanic water pollution?
Multiple Choice on Water Pollution mcq
a) plastic waste
b) Industrial effluents
c) oil spills
d) domestic waste
2.  Which of the following is the leading cause of death and diseases worldwide?
a) water pollution
b) radioactive pollution
c) air pollution
d) soil pollution
3. All the following are notorious oil spills except
a) Deepwater Horizon, 2010
b) Love canal disaster
c) Exxon Valdes, 1991
d) Gulf War, 1991
4. Eutrophication by sewage pollution refers to the
a) nutrient enrichment of freshwater bodies
b) nutrient depletion of freshwater bodies
c) toxic chemical accumulation in freshwater bodies
d) Heavy metal accumulation in freshwater bodies
5. Which of the following is the major reason for algal bloom?
a) presence of heavy metals
b) contamination by pathogens
c) Eutrophication
d) Soil erosion
6. Which of the following is the major cause of biomagnifications?
a) Eutrophication
b) detergent pollution
c) Pesticide pollution
d) Industrial pollution
7. Which of the following is an indicator of organic water pollution?
a) BOD
b) pH
c)  Salinity
d)  Eutrophication
8. Blue baby syndrome is due to the presence of
a) excess sulphate in drinking water
b) excess chlorine in drinking water
c)  excess heavy metals in drinking water
d)  excess nitrates in drinking water
9. Mercury poisoning in water is the reason for  
a) Pellegra
b) Minimata disease
c) Itai-Itai disease
d)  Scurvy
10. Itai-itai disease is caused by
a) Pb poisoning
b) Cd poisoning
c) Hg poisoning
d) Cu poisoning
Answers:
1. c)  oil spills
2. a) water pollution
3.  b) Love canal disaster
4.  a) nutrient enrichment of freshwater bodies
5. c) Eutrophication
6. c) Pesticide pollution
7. a) BOD
8. d)  excess nitrates in drinking water
9. b) Minimata disease
10. b) Cd poisoning
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MCQ on Population Genetics - Hardy Weinberg Equilibrium Problems

1. Approximately 4% of the turtle population in the pond shows the recessive phenotype long nose (nn)What is the frequency of the dominant allele (N) in the population?
(A) 0.16
(B) 0.20
(C) 0.40
(D) 0.32
(E) 0.80
MCQ on Population Genetics - Hardy Weinberg Equilibrium

2.  Approximately 4% of the turtle population in the pond shows the recessive phenotype— long nose (nn).  What is the frequency of heterozygotes in the population?
(A) 0.08
(B) 0.24
(C) 0.32
(D) 0.48
(E) 0.64
3. Within the squirrel population at park, 16% show the recessive phenotype of a curled tail (tt). What is the frequency of the dominant allele (T) in the population?
(A) 0.40
(B) 0.16
(C) 0.26
(D) 0.60
(E) 0.32
4. Within the squirrel population at park, 16% show the recessive phenotype of a curled tail (tt).  What is the frequency of heterozygotes in the population?
(A) 0.08
(B) 0.24
(C) 0.36
(D) 0.48
(E) 0.64
5.  In a population, 600 individuals have MM blood group, 300 have MN blood group, and 100 have NN blood group. What will be the frequencies of M and N alleles in this population?
(A) M= 0.79 and N=0.1
(B) M= 0.65and N=0.35
(C) M= 0.30 and N=0.60
(D) M= 0.75 and N=0.25
(E) M= 0.61 and N=0.19

6.The following genotypes are found in a population: AA -70, Aa-50, aa-20
What are the allele frequencies of A and a?
(A) A= 0.08 and a=0.14
(B) A= 0.63and a=0.36
(C) A= 0.32 and a=0.68
(D) A= 0.68 and a=0.32
(E) A= 0.68 and a=0.14

Learn more: 
Answers:
1.(E) 0.80
2.(C) 0.32
3. (D) 0.60
3. (D) 0.48
5. (D) M= 0.75 and N=0.25
6. (D) A= 0.68 and a=0.32
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MCQ on Horticulture

1. Which of the following indoor plants is poisonous?
a) Cordline
b) Chlorophylum
c) Dieffenbachia
d) Draceana

2. In a formal garden the imaginary central line is known as
a) focal point
b)Hedges
c)Axis
d)Edges

3. Ixora can be classified into which of the following ?
a)Herbs
b)Shrubs
c)Trees
d)Climbers

4. Technique to control shape, size and direction of plant growth is known as
a) training
b)topiary
c)thinning
d)Dis budding

5. The best method to propagate a good quality jack fruit tree is
a)seed propagation
b)tongue grafting
c)approarch grafting
d)Layering

6. Rooting chemical Rootex contains
a)IAA
b)IBA
c)kINETIN
d)2, 4-D

7. Plant suitable for Pergolas among the following
a)Jasmine
b)Casuarina
c)Tuja
d)Phyllanthus

8. Chamber used to perform tissue culture operation in aseptic conditions
a)laminar air flow
b)autoclave
c)alcohol lamps
d)culture medium

9. Small pierce of plant used to begin tissue culture is termed
a) ex plant
b)mother plant
c)root stock
d)scion

10. Mushroom is the fruiting body of
MCQ on Horticulture
a) virus
b)fungus
c)phytoplasma
d)bacteria
Answers
1.c) Diffenbachia
2.c)Axis
3.b)Shrubs
4.a) training
5.c)approarch grafting
6. b)IBA
7. a)Jasmine
8. a)laminar air flow
9. a) ex plant
10. b)fungus
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Multiple Choice Question on Molecular Evolution

1. The age of earth is estimate to be about
a)10000 years old
b)4-5 billion years ago
c)600 million year old
d)10-20

2. Which one of the following are Archaebacteria?
a)Actinomycetes
b)Pseudomonas
c)Rickettisae
d)Methanogens

3.Formation of most amino acids as well as adenine and other nucleic acid bases from inorganic molecules was experimentally shown by
Urey Miller experiment - MCQ on Molecular Evolution

a) Hugo de vries
b) Urey and Miller
c) Oparin and Haldane

d)Pasteur

4. The most primitive extant eukaryotes belong to the genus
a)plasmodium
b)tetrahymena
c)chlamydomonas
d)Giardia

5. Cambrian Explosion refers to
a) Origin of life
b)Origin of phyla
c) Origin of man
d)extinction of Dinosaurs

6. Which of the following statement cannot be support the endosymbiotic theory for the orgin of mitochondria?
a)Mitochondria DNA has a circular genome
b)mitochondrial ribosomes are inactivated by the antibiotic chloramphenicol
c)mitochondrial genes code for enzymes of oxidative respiration
d)mitochondrial ribosomes are 70s

7. Aerobic respiration is thought to have first appeared in some organisms of approximate age
a)1.0-1.5bp
b) 2.0-2.5bp
c)3.0-3.5bp
d)3.5-4.0bp

8. Which of the following process offers the greatest opportunities for accelerating the evolution of new useful proteins?
a)exon shuffling
b)intron excisions
c)transposons insertions
d)DNA amplification

9. The correct chronological sequences of geological times is
a) Devonian, Carboniferous, Cretaceous, Eocene
b) Eocene, Devonian, Carboniferous, Cretaceous
c) Devonian, Carboniferous, Eocene ,Cretaceous
d) Carboniferous, Devonian, Cretaceous, Eocene

10. The extant bacterial group that is most closely related to the ancestor from which mitochondria evolved is
a)purple photosynthetic bacteria
b)archaebacteria
c)cyanobacteia
d)methanogens

Learn more: MCQ on Zoology (Animal Science)
Answers:
1. b)4-5 billion years ago
2. d)Methanogens
3. b) Urey and Miller
4. d)Giardia
5.b) Origin of phyla
6. c)mitochondrial genes code for enzymes of oxidative respiration
7. b) 2.0-2.5bp
8.a)exon shuffling
9. a) Devonian, Carboniferous, Cretaceous, Eocene
10.a)purple photosynthetic bacteria
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