MCQ Biology - Learning Biology through MCQs

Biology Multiple Choice Questions and Answers for Different Competitive Exams

Multiple Choice Questions on Biomolecules

1.Number of essential elements in animals are
a)16
b)18
c)20
d)25
Multiple Choice Questions on Biomolecules - DNA
2. Cellular micromoleules are
a)amino acids, water, minerals, nucleotides and sugar
b) glycogen, amino acids, minerals and nucleotides
c)water, minerals, proteins and nucleotides
d)sugars, water, mineral, nucleotides an d proteins

3.The ratio between hydrogen and oxygen in a carbohydrate is
a)5:1
b)4:3
c)3:1
d)2:1

4.Which one is fat soluble vitamin?
a)vit A
b) vit D
c) vit E
d)All of these

5.A non reducing sugar is
a)glucose
b)sucrose
c)fructose
d)maltose

6.Which one is basic amino acid?
a)proline
b)arginine
c)proline
d)histidine

7. Which of the following protein has storage capacity?
a)glutenins
b)myosin
c)chondrin
d)keratin

8.Sweetest sugar is
a)frucose
b)glucose
c)mannose
d)lactose

9.Which one of the following is a reducing sugar?
a)galactose
b)gluconic acid
c)sucrose
d)b methyl galctoside

10.An organic substance bound to an enzyme and essential for its activity is called
 a)isoenzyme
b)coenzyme
c)holoenzyme
d)apoenzyme
Answers
1. d)25
2. a)amino acids, water, minerals, nucleotides and sugar
3. d)2:1
4.d)All of these
5. b)sucrose
6. b)arginine
7. a)glutenins
8. a)frucose
9. a)galactose
10. b)coenzyme
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MCQ on Dormancy and Seed germination

1. Dormancy is the
a) failure of a seed to germinate under favourable condition
b) failure of a seed to germinate under unfavourable condition
c) the ability of a seed to germinate under favourable condition
d) the ability of a seed to germinate under unfavourable condition
MCQ on Dormancy and Seed germination

2. Which of the following statement is true regarding dormancy?
a) Dormancy may be due to seed coats impermeability to CO2
b) Dormancy helps the seed to overcome unfavourable condition
c) Dormancy helps the seed to germinate during unfavourable condition
d) Dormancy may be due to soft fragile seed coat

3. Which of the following is a natural germination inhibitor that induces dormancy?
a) auxin
b) cytokinin
c) ABA
d) gibberellin

4. Some seeds enter dormancy when exposed to unfavourable condition for some time. Such dormancy is called  
a) immediate dormancy
b) primary dormancy
c) secondary dormancy
d) short term dormancy

5. Which of the following plant exhibit dormancy due to immature embryo?
a) Xanthium
b) Orchids
c) Hibiscus
d) Solanum

6. The process of weakening the seed coat to break dormancy is called
a) vernalization
b) scarification
c) photoperiodism
d) stratification

7. Photoblastic seeds are seeds
a) affected by light for germination
b) not affected by light for germination
c) independent of light for germination
d) affected by light and temperature for germination

8. Which is the pigment is involved in the germination of photoblastic seeds?
a) chlorophyll
b) carotenes
c) phytochromes
d) phaeophytin

9. Which of the following hormone is a dormancy inducer?
a) 2-4D
b) GA4
c) ABA
d) GA3
10. Which of the following is the structure in the seed coat that prevents water and O2 entry into seed thereby inducing dormancy?
a) strophiolar plug
b) pericarp
c) exocarp
d) epicarp
Answers:
1. b) failure of a seed to germinate under unfavourable condition
 2. b) Dormancy helps the seed to overcome unfavourable condition
3. c) ABA
4. c) secondary dormancy
5. b) Orchids
6. b) scarification
7.a) affected by light for germination
8. c) phytochromes
9. c) ABA
10. a) strophiolar plug
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MCQ on Excretory Products and their Elimination

1. The final product of ornithine cycle is
a) citrulline
b) urea
c)ammonia
d)arginine

2.In which part of nephron, reabsorption of glucose is maximum from filtrate?
a)Henle’s loop
b)Distal convoluted tubule
c)seminiferous tubules
d)Proximal convoluted tubule

3. Functional kidney of mammals is
a)archinephros type
b)metanephros type
c)pronephros type
d)ophisthosnephros type
MCQ on Excretory Products and their elimination-mcq on excretory system

4. The maximum amount of electrolytes and water(70-80%) from the glomerular filtrate is reabsorbed in which part of the nephron?
a)Ascending limb of loop of Henle
b) Distal convoluted tubule
c) Descending limb of loop of Henle
d) Proximal convoluted tubule

5.The peritubular capillaries of the nephron arise from the
a)afferent arteriole
b) efferent arteriole
c) renal artery
d)arcuate artery

6.Which of the following is true for excretion in humans?
a) Glucose and aminoacids are reabsorbed in PCT by simple diffusion
b)DCT is impermeable to water
c)on an average, 25-30 gm of urea is excreted out per day
d)Maximum reabsorption occurs in the loop of Henle

7. A fall in GFR (glomerular filtration rate) activates
a)juxtaglomerular cells to release renin
b)adrenal cortex to release aldosterone
c)adrenal medulla to release adrenaline
d)posterior pituitairy to release vasopressin

8.Which one of the following characteristics is common both in humans and adult frogs?
a)four chambered heart
b)internal fertilization
c)nucleated RBCs
d)ureotelic mode of excretion

9. Loop of Henle is found in
a)lung
b)liver
c)neurn
d)nephron

10. Fresh water bony fishes maintain water balance by
a) excreting a hypotonic urine
b) drinking small amount of water
c)excreting salt across their gills
d)excreting wastes in the form of uric acid
Learn more: 
Answers
1. b) urea
2. d)Proximal convoluted tubule
3. b)metanephros type
4. d) Proximal convoluted tubule
5. b) efferent arteriole
6. c)on an average, 25-30 gm of urea is excreted out per day
7. a)juxtaglomerular cells to release renin
8. d)ureotelic mode of excretion
9. d)nephron
10. a) excreting a hypotonic urine
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MCQ on Agricultural Microbiology

1. First antifungal antibiotic by
a)cycloheximide
b)neomycin
c)aureofungin
d)nystatin

2. Lysozyme treated cells of Gram + ve bacteria are called
a) protoplast
b)sphaeroplast
c)cytoplasm
d)mesosomes

MCQ on Agricultural Microbiology

3. Phosphorus solubilizing microorganism
a)VAM
b)Mucor
c)Rhizopus
d)E.coli

4. Name of the bacteria producing endospore is
a)Bacillus
b) Agrobacterium
c)E.coli
d)Xanthomonas

5. UV light are microcidal due to the formation of  
a)pyrine dimers
b)pyrimidine dimer
c)DNA damage
d)RNA damage

6. Neomycin is produced by
a)S nouesii
b)S fradiae
c)S erthyreus
d)S venezuelea

7. Lysozyme treated cells of Gram - ve bacteria are called
a) protoplast
b)sphaeroplast
c)cytoplasm
d)mesosomes

8. Inhibitory action of Pencillin is
a)protein synthesis
b)cell wall synthesis
c)both
d)None of these

9.Milky disease is caused by
a)Bacillus thuringiensis
b)Lactobacillus lactis
c)Bacillus popiliae
d)none of these

10. Giesma stain are used as particularly applicable for staining
a)protozoa
b)spores
c)rickettsias
d)both a and c
Answers
1. c)aureofungin
2. a) protoplast 
3. a)VAM 
4. a)Bacillus
5. b)pyrimidine dimer
6. b)S fradiae
7. b)sphaeroplast
8. b)cell wall synthesis
9. c)Bacillus popiliae

10. d)both a and c
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Multiple Choice Questions on Agriculture Statistics

1. Some sources of secondary data are
a) interaction record of a firms sales
b) a firm in a survey conducted by it
c) reports and publications of Central and State Governments

2. Diagram and Graphs are tools of
a)collection of data
b) analysis
c) presentation
d)none of these
Statistics Equation- Agriculture Statistics  Multiple Choice Questions

3. In a moderately symmetrical distribution
a)AM>HM>GM
b) GM>HM>GM
c) HM>AM>GM
d) AM>HM>GM

4. In a negatively skewed distribution
a)mode<median<mean
b) median<mode<mean
c) mean<median>mode
d) median<mode<mean

5. Karl Pearson’s and coefficient of skewness is
a) equal to
b)less than
c) greater than
d) not related to Bowley and coefficient of skewness for any skewed distribution

6. When one regression coefficient is negative, the other would be
a)zero
b)positive
c)negative
d)bivariate

7. Yule’s coefficient of association can be
a) greater than 1
b) less than1
c)between +1
d)can be zero

8. When observed and expected frequencies completely coincide,  Ci square will be
a)+1
b)-1
c)+2
d)zero

9. If gross reproduction rate is more than 1, It indicates  population would
a)increases
b)decreases
c)neither increase nor decrease
d)none of these

10. P X Q would always be
a) zero
b) one
c)two
d) less than 1
Learn more: 
Answers
1. c) reports and publications of Central and State Governments
2. b) analysis
3. a)AM>HM>GM
4. c) mean<median>mode
5. d) not related to Bowley and coefficient of skewness for any skewed distribution
6. d)bivariate
7. c)between +1 
8. d)zero
9. a)increases 
10. b) one 
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Multiple Choice Questions on Agronomy

1.  Food Corporation of India was established in the year
a) 1968
b)1969
c) 1960
d)1965

2. High protein content is found in
a) Gram
b) rajmah
c)soyabean
d)mung bean

3. The maximum area in India is under which of the following crops?
a)Whaet
b) Maize
c) Paddy
d)cotton

4. Country having the maximum are of hybrid rice is
a) India
b) China
c) Japan
d) Indonesia

5. The aim of organic farming is
a) To reduce the dependence of chemical fertilizers
b) to improve the quality of crop produce
c) to reduce the cost of production of crops
d) to increase the crop production

6. The state having maximum groundnut production
a) Uttar Pradesh
b) Haryana
c) Rajasthan
d)Punjab

7.  Maximum edible oil in India is contributed by
a) Sunflower
b) Mustard
c) Castor
d)groundnut

8. The term Agronomy derived from
a) English
b) Greek
c)Russian
d)Sanskrit

9. Golden rice  is rich in

a) Vitamin A
b) Vitamin B
c) Vitamin C
d) vitamin K

10. The book, the nature and properties of soils is written by

a) DS Kler
b)TY Reddy and GHS Reddy
c) M Reddy
d)NC Brady
 Learn more: 

Answers
1. d)1965
2. c)soyabean
3. c) Paddy
4. d) Indonesia
5. a) To reduce the dependence of chemical fertilizers
6. d)Punjab
7. d)groundnut
8. b) Greek
9. a) Vitamin A

10. d)NC Brady
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MCQ on Animal Biotechnology

1. Following are produced by animal cells in culture and help to adhese to culture dish except
a)Glycoprotein
b)Collagen
c) Phospholipase A
d) Hyaluronic acid

2. Transgenic animals used for gene farming or molecular farming called
a) biopests
b)bioreactors
c)biofarmers
d)none of these

3. Mouse is preferred mammal for studies on gene transfers due to
a)short oestrous cycle and gestation period
b) short generation time
c) convenient in vitro fertilization
d) all of these

4.Technique to produce cells capable of continuous secretion of a single type of antibody to a predyined antigen is given by
a)Wheelock
b)Ross Marison
c)J R Birch
d)Kohler and Milstein

5. Which of the following mice are used for immunisation in the Hybridoma technology
a) Swiss mice
b) Balb/c  mass
c) Out bred mice
d) Indigenous mice

6. Salk and Sabin polio vaccines are
a) prepared from two different strains of polio virus
b) both are attenuated forms of vaccines
c) Salk vaccine is inactivated form and Sabin vaccine is attenuated form of vaccines
d) Salk vaccines is attenuated form and Sabin vaccine is inactivated form of vaccines

7. Reverse vaccinology indicates
a) from antigenic polysaccharide to vaccine development
b) from antigenic protein to vaccine development
c) from antibody to vaccine development
d) From genome sequence to vaccine development

8. First recorded attempts to maintain animal cells in culture can be attributed to
a) JR Birch
b) W scheirrer
c) Ross Harrison
d) Klausner

9. DNA insert placed within the thymine kinase gene of virus by a process of recombination forms
a) BPV vectors
b) Vaccinia virus
c) Polyoma virus vector
d) Bacculo virus vector

10. Hybridoma is a cell formed by the fusion of
a) plasma cell with a plasma cell of another species
b) T cell with a myeloma cell
c) macrophage with a myeloma cell
d) plasma cell with a myeloma cell
Learn more:
Answers
1. c) Phospholipase A
2. b)bioreactors
3. d)all of these
4. d)Kohler and Milstein
5. b) Balb/c  mass
6. c) Salk vaccine is inactivated form and Sabin vaccine is attenuated form of vaccines
7. b) from antigenic protein to vaccine development
8. c) Ross Harrison
9. b) Vaccinia virus
10. d)plasma cell with a myeloma cell
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