MCQ Biology - Learning Biology through MCQs

Biology Multiple Choice Questions and Answers for Different Competitive Exams

Multiple Choice Questions on Chemiosmosis and ATP synthesis

MCQ on Chemiosmosis
1. Chemiosmotic theory was proposed by?
a) J D Watson
b) Peter Mitchell
c) Francis Crick
d) H G Khorana
Multiple choice questions on Chemiosmosis and ATP synthesis

2. The organelle of chemiosmosis in cellular respiration is  
a) nucleoplasm
b) peroxisome
c) chloroplast
d) mitochondrion

3. Which of the following are the major events in chemiosmosis?
a) electron flow and release of energy
b) proton gradient formation
c) PMF driven ATP synthesis
d) all of these

4. According to chemiosmosis, electrons are donated by
a) NADH and FADH2
b) NADH and ATP
c) ATP and FADH2
d) NADH and FMN

5. The site of electron flow in chemiosmosis is
a) Mitochondrion
b) Outer Mitochondrial membrane
c) Inner Mitochondrial membrane
d) Mitochondrial matrix

6. The energy released from electron flow is used to pump protons (H+) from
a) Intermembrane space to cytoplasm
b) Outer Mitochondrial membrane to inner Mitochondrial membrane
c) Mitochondrial matrix to intermembrane space
d) Inner Mitochondrial membrane to outer Mitochondrial membrane

7. The site of proton gradient formation is   
a) Mitochondrial matrix
b) intermembrane space of mitochondria
c) Inner Mitochondrial membrane
d) outer Mitochondrial membrane

8. ATP synthesis by ATP synthase is driven by
a) H+ movement
b) electron movement
c) NADH movement
d) All of these

9. ATP synthase synthesise ATP and release ATP towards
a) Mitochondrial matrix
b) Inner Mitochondrial membrane
c) outer Mitochondrial membrane
d) intermembrane space

10. Chemiosmosis and associated ATP synthesis in photosynthesis take place in
a) inner mitochondrial membrane
b) thylakoid membrane of chloroplast in light reaction
c) stroma of chloroplast in dark reaction
d) thylakoid lumen of chloroplast in light reaction

1. b) Peter Mitchell
2. d) mitochondrion
3. d) all of these
4. a) NADH and FADH2
5. c) Inner Mitochondrial membrane
6. c) Mitochondrial matrix to intermembrane space
7. b) intermembrane space of mitochondria
8. a) H+ movement
9. a) Mitochondrial matrix
10. b) thylakoid membrane of chloroplast in light reaction

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Multiple Choice Questions on Paleobotany

1. Jurassic period is about
A)265 million years back
B)165 million years back
C)65 million years back
D)365 million years back

2. To which one of the following the genus Williamsonia belongs?

3. The pollen-bearing organs of Lyginopteris belong to

4.’Fossil beehives’ is the name associated with fossil

5. The leaves of Zygopteridaceae belong to the genus

6. Nipaniophyllum belongs to

7. Baragwanathia- a fossil pteridophyte was discovered from
A)Rhynie chert bed of Scotland
B)Raj Mahal hills of Bihar
C)Silurian beds of Victoria, Australia
D)Mudstones near Giloba, Newyork

8.The diatomaceous earth of tertiary deposits found in California is
A)300 feet thick
B)500 feet thick
C)Over 1000 feet thick
D)Over 1000 feet and below 200feet thick

9. Zosterophyllum is
A)fossil alga
B)fossil Bryophyta
C)fossil pteridophyte
D)fossil gymnosperm

10.  Which is known as fossil bryophyte?
A)Marchantia palmata
B)Riicia fluitans
C)Naiadita lanceolata
D)Marchantia polymorpha

1. B)165 million years back
2. D)bennittitales
3. B)Crosstheca
4. D)Ginkgoales
5. D)Ptilophyllum
6. D)Pentoxylales
7. C)Silurian beds of Victoria, Australia
8. C)Over 1000 feet thick
9.C)fossil pteridophyte
10. C)Naiadita lanceolata
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MCQ on Biological Classification ( Set 3)

1. Which of the following shows coiled RNA strand and capsomers?
B)Tobacco mosaic virus
C)Measles virus

2. Viruses have
A) DNA enclosed in a protein coat
B)prokaryotic nucleus
C)single chromosome
D)both DNA and RNA

3. Archae bacteria differ from eubacteria in
A)cell membrane structure
B)mode of nutrition
C)cell shape
D)mode of reproduction

4. The genetic material of a viroid is

5.The smallest organisms which are self-reproducing in free-living state are known as

6. Which of the followingly wrongly matched?
A)D J Ivanowski- Microbes smaller than bacteria cause mosaic disease of tobacco
B)W.M Stanely- Crystalloid proteins
C)L Pasteur- Virus means venom or poisonous fluid
D)T.O. Diener- Viroids are found to be a free DNA

7.The organisms which completely lack a cell wall and can live without oxygen are

8. According to five kingdom systems of classification, which group does blue-green algae belong to?

9.  Which of the following characters belongs to the Kingdom Monera?
D)Presence of cell walls  made of cellulose

10. Five kingdom system of classification suggested by R H Whittaker is not based on
A)presence or absence of a well-defined nucleus
B)mode of reproduction
C)mode of nutrition
D)complexity of body organization

1.B)Tobacco mosaic virus
2. A) DNA enclosed in a protein coat
3. A)cell membrane structure
4. B)RNA
6. D)T.O. Diener- Viroids are found to be a free DNA
7. A)mycoplasmas
8. B)Monera
9. B)Heterotrophic
10. B)mode of reproduction
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MCQ on Viruses

1.An anti viral substance which prevents the synthesis of a virus in the cell is

2.Who separated the protein coat virus from RNA core by chemical means?
D)Frankel Conrat

3. Which part of the plant cannot be infected by the virus?
A)Shoot apex

4.One of the following is an incorrect statement
A)Herps disease is due to Myxomyces sp
B)The virus with nucleic acid and protein coat is called virion
C)The virus with nucleic acid but without protein coat is called viroid
D)Tadpole shaped bacteriophages are of different forms

5. Tobacco Mosaic Virus (TMV) was first isolated as crystals by 
A)W M Stanley
C)A Mayer

6. Which one of the following enzyme is present in the bacteriophage?
D)Succinic dehydrogenase

7. Virus contain the following
I. Genome II. Capsid III. Capsule IV. Enzyme
A) I, II and III are correct
B)I, II, III, and IV are correct
C)I, II and IV are correct
D)II, III, and IV are correct

8. The common viral disease of Papaya
A)Leaf roll
B)Big Bud
C)Leaf mosaic
D)Leaf curl

9. Viruses that persist in the cell and cause recurrent disease are called
A)Oncogenic viruses
B)Latent viruses
C)Cytopathic viruses
D)Resistant viruses

 10. Why the lysogenic cycle is more beneficial to a virus than lytic cycle under certain circumstances?
A)The lysogenic cycle prevents local extinction of the host while still retaining its infection potential
B)By integrating with the bacterial chromosomes, the genetic instructions for the virus become refreshed after one or more replication events during binary fission
C)Lysogenic infection cycles do not harm their host cells, so they can produce virus particles indefinitely
D)Lysogeny cause more mutations to occur in the virus, creating more variants upon which natural selection can operate
1. D)Interfereon
2. D)Frankel Conrat
3. A)Shoot apex
4.A)Herps disease is due to Myxomyces sp
5. A)W M Stanley
6. C)Lysozyme
7. C)I, II and IV are correct
8. D)Leaf curl
9. B)Latent viruses
10. A)The lysogenic cycle prevents local extinction of the host while still retaining its infection potential
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Multiple choice questions on Phloem Transport

1. The long-distance transport of photosynthate from one region to another in higher plants is called
a) xylem translocation
b) phloem translocation
c) apoplast
d) symplast

2. All the following are ‘sink’ except
a) fruit
b) seed
c) leaves
d) rhizome
Multiple Choice Questions on Phloem Transport

3. Which of the following is a ‘source’?  
a) green parts
b) Fruit
c) tubers
d) seed

4. The movement of photosynthate through phloem is always
a) from source to sink
b) from sink to source
c) bi directional
d) none of these

5. The process of transferring sugar formed in mesophyll cells to sieve tubes of phloem is called
a) photosynthate transfer
b) source-sink transfer
c) phloem loading
d) phloem unloading

6. Phloem unloading occurs
a) from low concentration to high concentration
b) with concentration gradient
c) against concentration gradient
d) remains same

7. Phloem loading is the transfer of sugar from
a) source to sink
b) Leaves to sieve tubes
c)  fruits to seed
d)  all of these

8. All the following statements are false regarding phloem loading except
a) Phloem loading is from phloem cells to leaves
b) phloem loading occurs in concentration gradient
c) Phloem loading is an active process
d)  phloem loading is from sink to source

9. The process of transferring sugar from sieve tubes to sink is called
a) photosynthate transfer
b) source sink transfer
c) phloem loading
d) phloem unloading

10. According to Mass flow hypothesis, mass flow of solute from source to sink is due to  
a) concentration gradient
b) turgor pressure gradient
c) osmosis
d) osmosis and diffusion

1. b) phloem translocation
2. c) leaves
3. a) green parts
4. a) from source to sink
5. c) phloem loading
6. b) with concentration gradient
7. d)  all of these
8. c) Phloem loading is an active process
9. d) phloem unloading
10.b) turgor pressure gradient
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Plant Science Multiple Choice Questions

11. Litmus is a dye obtained which lichen?
A) Lecanora
 B) Cladonia
C) Peltigera
D) Roccella
12. Infoldings produced by cytoplasmic membranes seen in bacteria are called
A) Fimbriae
B) Pili
C) Mesosomes
D) Flagellin
13. Which among the following is not a prophylactic method?
A) Protection
B) Eradication
C) Introduction
D) Exclusion
14. The first virus demonstrated to cause cancer is
A) Rous sarcoma virus
B) Mouse mammary tube virus
C) Feline Leukemia virus
D) Avian Leukosis virus
15. Labellum in Orchidaceae comes to anterior side by the twisting of the ovary through 180 degree. This process is called
A) Adnation
 B) Articulation
C) Resupination
D) Attenuation
16. Which of the following region has maximum diversity?
A) Mangrooves
B) Temperate rainforest
C) Taiga
D) Coral reefs
17. Bioinformatics tool CLUSTAL is a

A) Program that compares nucleotide sequences to sequence database.
B) Computation phylogenetic package of programs for drawing evolutionary trees.
C) Computer program series widely used for multiple sequence alignment.
D) Free open source software for rapid database searching with sequence patterns and
protein motif identification.
18. Which of the following is considered as a noncovalent bond?
A) Electrostatic interactions
 B) Hydrogen bonds
C) Van der waals interactions
D) All of the above
19. Techniques that can be used to elucidate information about protein shape are
A) X-ray crystallography
B) NMR spectroscopy
 D) A and B
20. Which among the following is not a plant fossil?
A) Archaeopteryx
 B) Lepidocarpon
C) Lepidodendron
 D) Rhynia
11. D) Roccella
12. C) Mesosomes
13. C) Introduction
14. A) Rous sarcoma virus
15. C) Resupination
16. D) Coral reefs
17. C) Computer program series widely used for multiple sequence alignment.
18. D) All of the above
19.  D) A and B
20. A) Archaeopteryx
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Plant Science (Botany) Multiple Questions and Answers

1. Capitulum consist of

A) Ray florets only
B) Disc florets only
C) Ray florets and disc florets
 D) None of the above

2. Mitochondria are absent in
A) Green algae
B) Brown algae
C) Red algae
D) Blue green algae

3. Which one is an essential mineral which is not a constituent of any enzyme?
A) Zn B) Mn C) Si D) Mg

4. Naple’s clamp is a device that enables the specimens to be accurately oriented
A) Microscope
 B) Sledge microtome
C) Atomic emission spectroscopy
D) Spectrophotometre

5. In which of the following types of ovules do the micropyle and the funicle come to lie in one
straight line
A) Orthotropous
B) Anatropous
C) Hemi Anatropous
 D) Campylotropous

6. Cytokinins are
A) Adenine derivatives
B) Guanine derivatives
C) Cytidine derivatives
D) Thymidine derivatives

7. Who among the following is not a Rediscoverer of Mendelism
A) Karl Correns
B) Tschemark
C) Hugo Devries
D) T. H. Morgan

8. In geological time scale which time periods is known as the age of gymnosperms?
A) Silurian and Devonian
B) Devonian and carboniferous
C) Triassic and Jurassic
 D) Jurassic and cretaceous

9. Carrageenin is obtained from the cell walls of algae……
A) Ascophyllum
B) Chondrus
C) Fucus
D) Codium

10. Which type of life cycle is shown by diatoms?
A) Diplontic type
B) Haplontic type
C) Diplobiontic type
D) Haplobiontic type
1. C) Ray florets and disc florets
2. D) Blue green algae
3. C) Si
4.  B) Sledge microtome
5. A) Orthotropous
6. A) Adenine derivatives
7. D) T. H. Morgan
8. C) Triassic and Jurassic
9. B) Chondrus
10.  B) Haplontic type
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MCQ on Plant pathology - Plant Diseases

1. Earcockle disease of wheat is caused by
a)Puccinia tritici
b)Anguina tritici
c)Corynebacterium tritici
d)none of these
2.Root knot of Brinjal (egg plant) is caused by
 a)Meloidogyne incognita
b)fusarium udum
c)Pseudomonas rubrillineans
d)Anguina solanacearum
3. Wilt of pigeon pea is caused by
a)Xanthomanas citri
b)Fusarium udum
c)Phytophthora infestans
d)Pseudomonas rubrilineans
MCQ on Plant pathology - Plant Diseases

4. White rust of crucifers by
5.Downy mildew disease is caused by
6. Wart disease of potato is caused by
a)Personospora destructor
b)Phytophthora infestans
c)Phythium debaryanum
d)Synchytrium endobioticum
7.Which is responsible for wood rot?
d)none of these
8. Potato famine of Ireland (1845) was caused by
 a)Phytophthora palmivora
b)Plasmopara viticola
c)Puccinia graminis
d)Phytophthora infestans
9.Covered smut of sorghum is caused by
 a) Sphacelotheca cruenta
b) Sphacelotheca reiliana
c) Sphacelotheca sorghii 
d)Tolypesporium ehrenburghii
10. Early leaf spot disease in Arachis hypogea is caused due to infection of
 a)Cererospora personata
b)Agrobacterium tumefaciens
c)Phytophthora infestans
d)Gibberella fujikuroi
1. b)Anguina tritici
2. a)Meloidogyne incognita
3. b)Fusarium udum
4. a)Albugo
5. c)Peronospora
6. d)Synchytrium endobioticum
7. b)Polyporus
8. d)Phytophthora infestans
9. c) Sphacelotheca sorghii 
10. a)Cererospora personata
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MCQ on Plant Science - Term coined by

Term coined by
1. The term Meiosis was given by:
a)A Fleming
b)Frame  and Moore
d)Knoll and Ruska

2.The term “antibiotic” was coined by
 a)Edward Jenner
b)Louis Pasteur
c)Selman Waksman
d)Alexander Fleming
MCQ on Plant Science - Term coined by

3. The term ‘protoplasm’ was given by

4. The term mutation was introduced by
b) Mendel
c)Hugo de vries

5. The term ‘guttation’ was coined by
c)Stephan Hales

6. The term ‘gene’ was introduced by

7.The term ecosystem was first coined by
d)None of these

8.The term ‘chromatophore’ was coined by
c)Singer and Nocolson

9.The term ‘cytoplasm’ and ‘nuceloplasm’ were given by

10.The term mitochondria was given by
c)de Duve
1. b)Frame  and Moore
2. c)Selman Waksman
3. b)Purkinje
4. c)Hugo de vries
5. d)Bergerstein
6. b)Johnnsen
7. b)Tansley
8. a)Schmitz
9. b)Strasburger
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