MCQ Biology - Learning Biology through MCQs

Biology Multiple Choice Questions and Answers for Different Competitive Exams

Multiple Choice Questions on Genetic code

1) Genetic code translated the language of 
a)amino acids into that of RNA
b) Proteins into that of RNA
c) RNA into that of DNA
d) RNA into that of proteins

2. Genetic code is not
b)with commas 

3. UAA is known as
d)None of these

4. Leucine is coded by 
a) UUA
b) CCC
c) AAA
d) UAA

5. Amber is

6. Opal is a termination codon represented by triplet codon in RNA
b) UGA
c) AGU
d) UUU

7. The number of nonsense codons in the genetic code dictionary is 

8. Wobble hypothesis was proposed by
d)Watson and Crick

9. Which one of the following is not an mRNA codon
b) UCU
c) TAC
d) UUU

10. The initiator AUG in prokaryotes codes for 
a) Valine
b)Formyl methionine  
c) Phenyl alanine
d) Tyrosine
1. d) RNA into that of proteins
2. b)with commas 
3. c)Ochre
4. a) UUA
5. c)UAG
6. b) UGA
7. c)3
8. b)Crick
9. c) TAC
10. b)Formyl methionine  
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Worksheet on DNA structure

This is a worksheet on DNA that helps you to assess your understanding on the structure of DNA. DNA is an amazing molecule that serves as genetic material in all organisms from bacterium to blue whale.
These are some pages that will help you to know DNA much closer.
DNA Structure worksheet
DOWNLOAD (pdf)  Check your answers
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Multiple Choice Questions on Wood Anatomy

1. Major part of annual rings is formed by

a) spring wood
b) autumn wood
c) both a and b
d) none of these

2. Autumn wood is present at the ---of annual ring
d)none of these

3. Heartwood is also known as 
b)sap wood
c)non porous wood
d)porous wood

4. Which region in heartwood is light in colour?
a)innermost region
b)middle region
c)outermost region
d)peripheral region

5. Tracheid percentage is 90-95% in 
a)soft wood

6. Wood that entirely lacks vessel

a) non porous wood
b) homoxylous wood
c) early wood
d) hard wood

7. Which of the following monocot showing anaomalous secondary growth?
a) Rice
b) Maize
d)none of the above

8. Which of the following is durable?
a) Heartwood
b) soft wood
c) sap wood
d)Spring wood

9. In an old stem the major part of wood is filled with tannins, resins, gums etc. This region is known are
a) sap wood
b) soft wood
c) Heartwood
d)Spring wood

10. The age of tree by counting the annual rings is  called
1. a) spring wood
2. c)end
3. a)duramen
4. d)peripheral region
5. a)soft wood
6. a) non porous wood
7. c)Dracena
8. a) Heartwood
9. c) Heartwood
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Multiple Choice Questions on Biogeochemical cycle

biogeochemical cycle
1. Biogeochemical cycles are also known as
a) material cycling
b)gaseous cycle
c) sedimentary cycling
d) none of the above
2. Which one is sedimentary cycle?
a)oxygen cycle
b) hydrogen cycle
c) nitrogen cycle
d) phosphorus cycle 
3. The phosphorus cycle lacks ---- component
a)a mineral
b)an aquatic
c)an organic
d)an atmospheric
4. The global hydrologic cycle supports a net flow of atmospheric water vapour from
a)land to the oceans
b)the oceans to land
c)polar to tropical regions
d)tropical to polar regions
5. Which of the following is not gaseous type cycle?
a)carbon cycle
b)nitrogen cycle
c)phosphorus cycle
d)oxygen cycle
6. In the phosphorus cycle, phosphorus becomes available by weathering of rock first to
a) consumers
d)all of these
7. The main nitrogen reservoir in the biosphere is the
8. Which of the following atoms most often limits the primary productivity of an ecosystem?
d) Carbon
9. Phosphorus cycle  absorbs phosphates in the form of 
10. Among the following biogeochemical cycles which one does not have losses due to respiration?
d)all of above
Learn more: Quiz on Nitrogen Cycle
1. a) material cycling
2. d) phosphorus cycle
3. d)an atmospheric
4. b)the oceans to land
5. c)phosphorus cycle
6. b)decomposers
7. c)atmosphere
8. d) Carbon
9. c)PO34-
10. d)all of above
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Multiple Choice Questions on Photosynthetic Pigments

1. Which of the following is a chlorophyll molecule lacking central Mg2+ ion?
a) chl a
b) bacteriochlorophyll 
c) chl c
d) pheophytin

2. The primary pigment in photosynthesis is  
a) chl a
b) chl b
c) chl a and chl b
d)  chl a, chl b and carotenoids

3. The pigments that gives brown colour to kelps or brown algae is
a) chl c
b) pheophytin
c) fucoxanthin
d) phycocyanin

4. Phycobilins (phycoerythrin and phycocyanin) are accessory pigments found in
a) green plants
b) blue green algae and red algae
c) blue green algae and diatoms
d) red algae and brown algae

5. Which of the following pigments are present in all photosynthetic plants?
a) chl a
b) chl a and b
c) chl a and carotenoids
d)  chl a, b and carotenoids

6. Instead of –CH3 group at the third C of the side group of Chl a, Chl b has
a) –COOH group
b) –CO group
c) –CHO group
d) –OH group

7. The photosynthetic activity of chlorophyll is maximum in
a) violet and red light
b) violet light
c) blue light
d) red light

8. Xanthophylls differ from carotenes (C40H56) in having
a) Mg
b) Cl
c) O2
d)  H
9. Which of the following is a water soluble pigment?
a) chl a
b) chl b
c) carotenoids
d) phycobilins

10. The photosynthetic pigments are located in  
a) chloroplast
b) grana
c) stroma
d) Thylakoid

Learn more: MCQ on Plant Sciences
1. d) pheophytin
2. a) chl a
3. c) fucoxanthin
4 . b) blue green algae and red algae
5. c) chl a and carotenoids
6. c) –CHO group
(Chl a: C55H72MgN4O5; Chl b:  ‎C55H70MgN4O6 for more Chlorophyll a vs b)
7. d) red light
8. c) O2, (Carotenes: C40H56Xanthophyll: C40H56O2)
9. d) phycobilins
10. d) Thylakoid
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Multiple Choice Questions on Microtechnique Histology

1.Which of the following is an azodye
a) Safranin
b) Haematoxylin
c) Aniline blue
d) Orange G

2. Carnoy’s solution is a mixture of
a) Aqueous chromic acid, Aqueous acetic acid and distilled water
b) Ethyl alcohol, Glacial acetic acid and commercial formalin
c) Ethanol, Glacial acetic acid and Chloroform
d) Aqueous alcohol, Aqueous acetic acid and distilled water

3. The sectioning of woody materials for histo enzymological study is made
sledge microtome
a)Rotary microtome
b) Sledge microtome
c) Cryotome
d) Rocking microtome

4. Sudan Black B is often used for visualization of
a) Protein
b) Carbohydrates
c) Aminoacids
d) Lipids

5. Chromatography that involves the separation of isomers
a) Counter-current chromatography
b) Chiral chromatography
c) Paper chromatography
d) Thin layer chromatography

6. The total volume of material, both solid and liquid in the column is known as
a) Void volume
b) Bed volume
c) Elution volume
d) Retension volume

7. Silica gel-G is used in
a) Thin layer chromatography
b) Column chromatography
d) GLC

8. Histochemical localization of proteins is performed by using
a) Sudan black
b) Mercuric bromophenol blue
c) Periodic acid Schiffs (PAS) reagent
d) Iodine potassium iodide (IKI) solution

9. Orcein is obtained from
a) Fractionation of coal tar
b) Heartwood of Caesalpinia
c) Roccella tinctoria.
d) Abdominal part of insects Dactylopius coccus

10. Janus green B is used to stain
janus green B

a) Chloroplast
b) Golgi complex
c) Vacuoles
d) Mitochondria

1. c) Aniline blue
2. c) Ethanol, Glacial acetic acid and Chloroform
3. b) Sledge microtome
4. d) Lipids
5. b) Chiral chromatography
6. b) Bed volume
7. a) Thin layer chromatography
8. b) Mercuric bromophenol blue
9. c) Roccella tinctoria.
10. d) Mitochondria
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Multiple Choice Questions on Plant Taxonomy

1. Level of taxonomic study concerned with the biological aspects of taxa, including intraspecific populations, speciation, evolutionary rates and trends
a) alpha taxonomy
b) beta taxonomy
c) gamma taxonomy
d) theta taxonomy

2. Labellum in Orchidaceae comes to anterior side by the twisting of the ovary
through 180 degree. This process is called
Labellum in Orchid

a) adnation
b) articulation
c) resupination
d) attenuation

3. The Commelinaceae family is commonly known as the
a) spiderwort family
b) aster family
c) grass family
d) lily family

4. Foeniculum vulgare belongs to the family

5. When two or more authors publish a new species or propose a new name, their names are linked using the epithet?

6. Binomials with identical genus name and specific epithet are called

7. A document containing a comprehensive account of a specific taxonomic group,
generally a genus or family is

8. Which among the following is considered a demerit of the ‘Engler and Prantl’
system of classification?
a)Gymnosperms are placed between Monocotyledons and Dicotyledons
b)Gymnosperms are placed among Dicotyledons
c)Dicotyledons are placed before Monocotyledons
d)Dicotyledons are placed after Monocotyledons

9. The principles of Numerical taxonomy were developed by
a)Bentham And Hooker
b)Engler And Prantl
c)Sneath And Sokal
d)Takhtajan And Cronquist

10.The newly collected specimen which is used as a substitute, when the original
type material is missing in a herbarium, is designated as

1. c) gamma taxonomy
2. b) articulation
3. a) spiderwort family
4. c)Apiaceae
5. c)et
6. b)Tautonym
7. c)Monograph
8. d)Dicotyledons are placed after Monocotyledons
9. c)Sneath And Sokal
10. c)Neotype
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Multiple Choice Questions on Food Preservation

1. Pasteurization is the process of heating milk
a) above 1210C
b) above boiling point
c) below boiling point
d) above 1500C

2. The process of preserving food by rapid freezing followed by dehydration under vacuum is called
a) Lyophilisation
b) Sterilization
c) Cold Dehydration
d) Cryopreservation

3. ‘Cold sterilization’ refers to the preservation of food by
a) Refrigeration
b) Radiation
c) Dehydration
d) Lyophilisation

4. All the following techniques are household preservation technique except
a) Smoking
b) Lyophilisation
c) Dehydration
d) Salting

5. What is the purpose for blanching (immersing food in hot water) vegetables during canning?
a) to soften products to fill better
b) to denature enzymes that change colour, texture
c) to reduce microbial population
d) All of the above

6. Who is regarded as the father of canning?
a) Nicolas Appert
b) Louis Pasteur
c) John Hall
d) Bryan Dokin

7. The method of preventing or reducing pathogens in food products by combining many methods like high temperature during processing, low temperature during storage, increasing the acidity etc is called
a) Mixed preservation approach
b) High pressure food preservation
c) Hurdle technology
d) Stumbling technology

8. Which of the following methods dehydrates microbial cells by plasmolysis thereby killing them?
a) sugaring  
b) smoking
c) heating
d) Pasteurization

9. The reason for food spoilage is
a) Growth of microorganisms like bacteria, fungus etc or insects
b) Autolysis
c) Oxidation by air that causes rancidity or colour changes
d) all of the above

10. The process of preserving meat by stewing in a covered earthenware jug 
a) burial
b) curing
c) jugging
d) all of these
1. c) below boiling point
2. a) Lyophilisation
3. b) Radiation
4. b) Lyophilisation
5. d) All of the above
6. a) Nicolas Appert
7. c) Hurdle technology
8. a) sugaring  
9. d) all of the above
10.c) jugging
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