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All questions of 2009 for JEE Exam
The length of DNA hgaving 23 base pair is- a)78 Å
- b)78.4 Å
- c)74.8 Å
- d)78.2 Å
Correct answer is option 'D'. Can you explain this answer?
The length of DNA hgaving 23 base pair is
a)
78 Å
b)
78.4 Å
c)
74.8 Å
d)
78.2 Å
|
Anjali Deshpande answered |
Distance between adjacent base pairs = 3.4Å
The resolving power of a compound microscope will increase with —- a)decrease in wave length of light and increase in numerical aperture
- b)increase in wave length of light and decrease in numerical aperture
- c)increase in both wave length of light and numerical aperture
- d)decrease in both wave length of light and numerical aperture
Correct answer is option 'A'. Can you explain this answer?
The resolving power of a compound microscope will increase with —
a)
decrease in wave length of light and increase in numerical aperture
b)
increase in wave length of light and decrease in numerical aperture
c)
increase in both wave length of light and numerical aperture
d)
decrease in both wave length of light and numerical aperture
|
Lavanya Menon answered |
Decrease in wavelength of light and increase in numerical aperature is responsible.
Which is not applicable to the Biological species concept ?- a)Hybridization
- b)Natural population
- c)Reproductive isolation
- d)Gene Pool
Correct answer is option 'A'. Can you explain this answer?
Which is not applicable to the Biological species concept ?
a)
Hybridization
b)
Natural population
c)
Reproductive isolation
d)
Gene Pool
|
|
Lavanya Menon answered |
Hybridization is not applicable to the bilogical species concept
Generally artificial Pacemaker consists of one battery made up of- a)Nickel
- b)Dry Cadmium
- c)Photo Sensitive Material
- d)Lithium
Correct answer is option 'D'. Can you explain this answer?
Generally artificial Pacemaker consists of one battery made up of
a)
Nickel
b)
Dry Cadmium
c)
Photo Sensitive Material
d)
Lithium
|
Asha Choudhury answered |
Lithium halide battery is used in artificial pacemaker
Protein coat of virus is known as :- a)Capsid
- b)Virion
- c)Virioid
- d)Bacterial wall
Correct answer is option 'A'. Can you explain this answer?
Protein coat of virus is known as :
a)
Capsid
b)
Virion
c)
Virioid
d)
Bacterial wall
|
Gaurav Kumar answered |
Protein coat of virus is called capsid
The duration of cardiac cycle is :- a)0.8 sec
- b)0.8 µ sec
- c)0.08 sec
- d)0.008 sec
Correct answer is option 'A'. Can you explain this answer?
The duration of cardiac cycle is :
a)
0.8 sec
b)
0.8 µ sec
c)
0.08 sec
d)
0.008 sec
|
|
Gaurav Kumar answered |
The duration of cardiac cycle is 0.8 sec
Identify the correct type of food chain :
dead animal → blow fly maggots → common frog → snake- a)Grazing food chain
- b)Detrital food chain
- c)Decomposer food chain
- d)Predator food chain
Correct answer is option 'B'. Can you explain this answer?
Identify the correct type of food chain :
dead animal → blow fly maggots → common frog → snake
dead animal → blow fly maggots → common frog → snake
a)
Grazing food chain
b)
Detrital food chain
c)
Decomposer food chain
d)
Predator food chain
|
|
Gaurav Kumar answered |
It is Detritus food chain. Always starts from dead organic material.
Graham’s Law is correlated with- a)Diffusion
- b)Osmoregulation
- c)Osmosis
- d)Adsorption
Correct answer is option 'A'. Can you explain this answer?
Graham’s Law is correlated with
a)
Diffusion
b)
Osmoregulation
c)
Osmosis
d)
Adsorption
|
|
Lavanya Menon answered |
Graham’s law of diffusion, rate of diffusion 
A character which is expressed in a hybrid is called- a)Dominant
- b)Recessive
- c)Co-dominant
- d)Epistatic
Correct answer is option 'A'. Can you explain this answer?
A character which is expressed in a hybrid is called
a)
Dominant
b)
Recessive
c)
Co-dominant
d)
Epistatic
|
Krishna Iyer answered |
Dominant gene is expressed in a hybrid
The average diameter of Red Blood Corpuscles of man is- a)7.2 µ m
- b)8.1 µ m
- c)9.2 µ m
- d)10.3 µ m
Correct answer is option 'A'. Can you explain this answer?
The average diameter of Red Blood Corpuscles of man is
a)
7.2 µ m
b)
8.1 µ m
c)
9.2 µ m
d)
10.3 µ m
|
Tejas Verma answered |
The average diameter of RBC of man is 7.2 µ m
Number of nitrogenous bases in a Codon is- a)3
- b)2
- c)1
- d)5
Correct answer is option 'A'. Can you explain this answer?
Number of nitrogenous bases in a Codon is
a)
3
b)
2
c)
1
d)
5
|
|
Krishna Iyer answered |
Three nitrogenous bases are found in a codon.
Cells in G0 phase of cell cycle- a)Exit cell cycle
- b)Enter cell cycle
- c)Suspend cell cycle
- d)Terminate cell cycle
Correct answer is option 'C'. Can you explain this answer?
Cells in G0 phase of cell cycle
a)
Exit cell cycle
b)
Enter cell cycle
c)
Suspend cell cycle
d)
Terminate cell cycle
|
Rishika Mishra answered |
Go is the arrest / suspended phase of cell cycle.
Which one of the following is the American Poultry breed- a)Australop
- b)Minovca
- c)Assel
- d)Rhod Island Red
Correct answer is option 'D'. Can you explain this answer?
Which one of the following is the American Poultry breed
a)
Australop
b)
Minovca
c)
Assel
d)
Rhod Island Red
|
Abhay Chauhan answered |
Rhod island Red is the American Poultry Breed
Which one of the following Leucocytes transforms into macrophages?- a)Eosinophil
- b)Basophil
- c)Monocyte
- d)Lymphocyte
Correct answer is option 'C'. Can you explain this answer?
Which one of the following Leucocytes transforms into macrophages?
a)
Eosinophil
b)
Basophil
c)
Monocyte
d)
Lymphocyte
|
|
Gaurav Kumar answered |
Monocytes transforms to form macrophages
Which part of the human brain is largest :- a)Cerebellum
- b)Thlamus
- c)Cerebrum
- d)Medulla
Correct answer is option 'C'. Can you explain this answer?
Which part of the human brain is largest :
a)
Cerebellum
b)
Thlamus
c)
Cerebrum
d)
Medulla
|
|
Krishna Iyer answered |
Cerebrum is the largest part of brain
The “Repeating Unit” of glycogen is- a)Fructose
- b)Mannose
- c)Glucose
- d)Galactose
Correct answer is option 'C'. Can you explain this answer?
The “Repeating Unit” of glycogen is
a)
Fructose
b)
Mannose
c)
Glucose
d)
Galactose
|
|
Lavanya Menon answered |
Glycogen is a homopolymer of glucose
Pernicious anaemia results due to deficiency of- a)Vit B1
- b)Vit A
- c)Vit B12
- d)Iron
Correct answer is option 'C'. Can you explain this answer?
Pernicious anaemia results due to deficiency of
a)
Vit B1
b)
Vit A
c)
Vit B12
d)
Iron
|
Anaya Patel answered |
Pernicious anaemia is caused by deficiency of vit B12 or Cyanocobalamine
The chemical nature of hormones secreted by α & δ cells of pancreas is –- a)Glycolipid
- b)Glycoprotein
- c)Steroid
- d)Polypeptide
Correct answer is option 'D'. Can you explain this answer?
The chemical nature of hormones secreted by α & δ cells of pancreas is –
a)
Glycolipid
b)
Glycoprotein
c)
Steroid
d)
Polypeptide
|
|
Tejas Verma answered |
Hormones produced by α cells (glucagon) and β cells (somatostatin) are polypeptide
Virus was discovered by whom?- a)Stanley
- b)Ivanowsky
- c)Herelle
- d)Beijerinek
Correct answer is option 'B'. Can you explain this answer?
Virus was discovered by whom?
a)
Stanley
b)
Ivanowsky
c)
Herelle
d)
Beijerinek
|
|
Krishna Iyer answered |
Ivanowsky discovered virus
Which one is product of aerobic respiration?- a)Malic acid
- b)Ethyl alcohol
- c)Lactic acid
- d)Pyruvic acid
Correct answer is option 'A'. Can you explain this answer?
Which one is product of aerobic respiration?
a)
Malic acid
b)
Ethyl alcohol
c)
Lactic acid
d)
Pyruvic acid
|
|
Krishna Iyer answered |
Malic acid is product of aerobic respiration
By which of the following methods, new and better varieties of plants can be formed?- a)Selection
- b)Grafting
- c)Hybridization
- d)Hybridization followed by selection
Correct answer is option 'D'. Can you explain this answer?
By which of the following methods, new and better varieties of plants can be formed?
a)
Selection
b)
Grafting
c)
Hybridization
d)
Hybridization followed by selection
|
Arnab Choudhary answered |
Better variety of plant can be formed by hybridisation followed by selection.
The genetic material of Rabies virus is- a)Double stranded RNA
- b)Single stranded RNA
- c)Double stranded DNA
- d)ssDNA
Correct answer is option 'B'. Can you explain this answer?
The genetic material of Rabies virus is
a)
Double stranded RNA
b)
Single stranded RNA
c)
Double stranded DNA
d)
ssDNA
|
Tejas Malik answered |
The genetic material of Rabies virus is ss RNA
The chemical nature of chromatin is as follows :- a)Nucleic acids
- b)Nucleid acid & histone proteins
- c)Nucleic acids, histone & non histone proteins
- d)Nucleic acids & non-histone proteins
Correct answer is option 'C'. Can you explain this answer?
The chemical nature of chromatin is as follows :
a)
Nucleic acids
b)
Nucleid acid & histone proteins
c)
Nucleic acids, histone & non histone proteins
d)
Nucleic acids & non-histone proteins
|
|
Anaya Patel answered |
Chromatin = nucleic acid + histone proteins + non - histone proteins
Trophic levels in ecosystem is formed by :- a)only bacteria
- b)only plants
- c)only herbivores
- d)Organisms linked in food chain
Correct answer is option 'D'. Can you explain this answer?
Trophic levels in ecosystem is formed by :
a)
only bacteria
b)
only plants
c)
only herbivores
d)
Organisms linked in food chain
|
|
Anaya Patel answered |
Trophic levels in ecosystem is formed by organisms linked in the food chain
Sporopollenin is chemically- a)Homopolysaccharide
- b)Fatty substance
- c)Protein
- d)Heteropolysaccharide
Correct answer is option 'B'. Can you explain this answer?
Sporopollenin is chemically
a)
Homopolysaccharide
b)
Fatty substance
c)
Protein
d)
Heteropolysaccharide
|
Shounak Unni answered |
Sporopollenin is chemically a fatty substance that persits in fossil state.
Feedback inhibition of enzymes is affected by which of the following- a)enzyme
- b)substrate
- c)end products
- d)intermediate end products
Correct answer is option 'C'. Can you explain this answer?
Feedback inhibition of enzymes is affected by which of the following
a)
enzyme
b)
substrate
c)
end products
d)
intermediate end products
|
Sanaya Menon answered |
Feedback inhibition is affected by end products
The scientific name of Asian tiger mosquito :- a)Aedes aegypti
- b)Aedes albopictus
- c)Aedes taeniorhynchus
- d)Aedes albolineatus
Correct answer is option 'B'. Can you explain this answer?
The scientific name of Asian tiger mosquito :
a)
Aedes aegypti
b)
Aedes albopictus
c)
Aedes taeniorhynchus
d)
Aedes albolineatus
|
Sneha Sengupta answered |
Aedes albopictus is an Asian tiger mosquito.
How many ATP molecules are obtained from fermentation of 1 molecule of glucose?- a)2
- b)4
- c)3
- d)5
Correct answer is option 'A'. Can you explain this answer?
How many ATP molecules are obtained from fermentation of 1 molecule of glucose?
a)
2
b)
4
c)
3
d)
5
|
Maya Sharma answered |
Two molecules of ATP are produced by fermentation of one molecule of glucose
Electron microscope is based on principle of- a)Electromagnetic theory
- b)Resolution of glass lenses
- c)Magnification of glass lenses
- d)Refraction of light
Correct answer is option 'A'. Can you explain this answer?
Electron microscope is based on principle of
a)
Electromagnetic theory
b)
Resolution of glass lenses
c)
Magnification of glass lenses
d)
Refraction of light
|
|
Rhea Basak answered |
Electrton microscope is based on principle of electromagnetic theory
The generation of excitation-contraction coupling involves all the following events except :- a)Generation of end-plate potential
- b)Release of calcium from troponin
- c)Formation of cross-linkages between actin and myosin
- d)Hydrolysis of ATP to ADP
Correct answer is option 'B'. Can you explain this answer?
The generation of excitation-contraction coupling involves all the following events except :
a)
Generation of end-plate potential
b)
Release of calcium from troponin
c)
Formation of cross-linkages between actin and myosin
d)
Hydrolysis of ATP to ADP
|
|
Janani Banerjee answered |
During generation of excitation contraction coupling calcium is attached to troponin
. Respiratory enzymes are present in the following organelle :- a)Peroxysome
- b)Chloroplast
- c)Mitochondrion
- d)Lysosome
Correct answer is option 'C'. Can you explain this answer?
. Respiratory enzymes are present in the following organelle :
a)
Peroxysome
b)
Chloroplast
c)
Mitochondrion
d)
Lysosome
|
|
Sharmila Choudhury answered |
Mitochondrion has respiratory enzymes for food oxidation
Genetically engineered bacteria are being employed for production of- a)Thyroxine
- b)Human insulin
- c)Cortisol
- d)Epinephrine
Correct answer is option 'B'. Can you explain this answer?
Genetically engineered bacteria are being employed for production of
a)
Thyroxine
b)
Human insulin
c)
Cortisol
d)
Epinephrine
|
|
Ankita Nambiar answered |
Human insulin is now being produced by genetically engineered bacteria (E.coli). This insulin is called Humulin
During replication of DNA, Okazaki fragments are formed in the direction of :- a)3′ → 5′
- b)5′ → 3′
- c)5′→ 5′
- d)3′→ 3′
Correct answer is option 'B'. Can you explain this answer?
During replication of DNA, Okazaki fragments are formed in the direction of :
a)
3′ → 5′
b)
5′ → 3′
c)
5′→ 5′
d)
3′→ 3′
|
|
Anshika Patel answered |
Okazaki fragments are formed in the direction of 5′ → 3′ , they join after wards.
CO2 acceptor in C3 cycle is- a)OAA
- b)RUBP
- c)PEP
- d)Malic acid
Correct answer is option 'B'. Can you explain this answer?
CO2 acceptor in C3 cycle is
a)
OAA
b)
RUBP
c)
PEP
d)
Malic acid
|
Diya Roy answered |
RUBP (Ribulose 1.5. biphosphate) is CO2 acceptor in C3 plant
Scirpophage incertulus is an example of :- a)Monophagus pest
- b)Diphagus pest
- c)Oligophagus pest
- d)Polyphagus pest
Correct answer is option 'A'. Can you explain this answer?
Scirpophage incertulus is an example of :
a)
Monophagus pest
b)
Diphagus pest
c)
Oligophagus pest
d)
Polyphagus pest
|
|
Rishika Bose answered |
Scrirpophaga incertelus is a monophagus pest that feeds on a single plant.
Goitre can occur as a consequence of all the following except :- a)Iodine deficiency
- b)Pituitary Adenoma
- c)Grave’s disease
- d)Excessive intake of exogenous thyroxine
Correct answer is option 'D'. Can you explain this answer?
Goitre can occur as a consequence of all the following except :
a)
Iodine deficiency
b)
Pituitary Adenoma
c)
Grave’s disease
d)
Excessive intake of exogenous thyroxine
|
Sahana Ahuja answered |
Excessive intake of exogenous thyroxine will not produce the symptoms of Goitre.
. The intensity levels of whispering noise is :- a)10 – 15 dB
- b)20 – 40 dB
- c)45 – 50 dB
- d)50 – 55 dB
Correct answer is option 'A'. Can you explain this answer?
. The intensity levels of whispering noise is :
a)
10 – 15 dB
b)
20 – 40 dB
c)
45 – 50 dB
d)
50 – 55 dB
|
|
Smrity answered |
Yeah , it is approx 20 dB but not more than 20
so option a is correct
so option a is correct
Collagen is a- a)Phosphoprotein
- b)Globulin
- c)Derived Protein
- d)Scleroprotein
Correct answer is option 'D'. Can you explain this answer?
Collagen is a
a)
Phosphoprotein
b)
Globulin
c)
Derived Protein
d)
Scleroprotein
|
Mehul Kulkarni answered |
Collagen is scleroprotein that requires vit-C for synthesis
Molecular scissors which cut DNA at specific site is- a)Pectinase
- b)Polymerase
- c)Restriction endo nuclease
- d)Ligase
Correct answer is option 'C'. Can you explain this answer?
Molecular scissors which cut DNA at specific site is
a)
Pectinase
b)
Polymerase
c)
Restriction endo nuclease
d)
Ligase
|
|
Ameya Das answered |
Restriction endonuclease is used to cut DNA at specific site (molecular scissor).
Citric acid cycle is the alternate name of which of the following?- a)HMP shunt
- b)Glycolysis
- c)TCA cycle
- d)Calvin cycle
Correct answer is option 'C'. Can you explain this answer?
Citric acid cycle is the alternate name of which of the following?
a)
HMP shunt
b)
Glycolysis
c)
TCA cycle
d)
Calvin cycle
|
Upasana Choudhury answered |
Citric acid cycle or Krebs’cycle or Tricarboxylic acid cycle is alternative names
The specific region of Hypothalamus, responsible for physiological sweat secretion, is- a)Para-ventricular nucleus
- b)Supra-Optic nucleus
- c)Median Eminence
- d)Pars Distalis
Correct answer is option 'A'. Can you explain this answer?
The specific region of Hypothalamus, responsible for physiological sweat secretion, is
a)
Para-ventricular nucleus
b)
Supra-Optic nucleus
c)
Median Eminence
d)
Pars Distalis
|
Nabanita Singh answered |
Paraventricular nucleus of hypothalamus is related to sweat secretion
FAD is electron acceptor during oxidation of which of the following?- a)α -ketoglutarate →Succinyl CoA
- b)Succinic acid →Fumaric acid
- c)Succinyl CoA →Succinic acid
- d)Fumaric acid →Malic acid
Correct answer is option 'B'. Can you explain this answer?
FAD is electron acceptor during oxidation of which of the following?
a)
α -ketoglutarate →Succinyl CoA
b)
Succinic acid →Fumaric acid
c)
Succinyl CoA →Succinic acid
d)
Fumaric acid →Malic acid
|
Rounak Shah answered |
FAD is electron acceptor during oxidation of succinic acid to fumaric acid
Name of a gaseous plant hormone is- a)IAA
- b)Gibberellin
- c)Ethylene
- d)Abscisic acid
Correct answer is option 'C'. Can you explain this answer?
Name of a gaseous plant hormone is
a)
IAA
b)
Gibberellin
c)
Ethylene
d)
Abscisic acid
|
|
Gopal Basu answered |
Ethylene is a gaseous plant hormone that acts for ripening.
In a CAM plant the concentration of organic acid :- a)increases during the day
- b)decreases or increases during the day
- c)increases during night
- d)decreases during any time
Correct answer is option 'C'. Can you explain this answer?
In a CAM plant the concentration of organic acid :
a)
increases during the day
b)
decreases or increases during the day
c)
increases during night
d)
decreases during any time
|
Charvi Chakraborty answered |
In a CAM plant the concentration of organic acid increases during night
The size of filtration slits of Glomerulus :- a)10 nm
- b)15 nm
- c)20 nm
- d)25 nm
Correct answer is option 'D'. Can you explain this answer?
The size of filtration slits of Glomerulus :
a)
10 nm
b)
15 nm
c)
20 nm
d)
25 nm
|
Madhurima Sengupta answered |
Average size of filteration slit of glomerulus is 25 nm.
Which one of the following is a systemic insecticide ?- a)Malathion
- b)Parathion
- c)Endrin
- d)Furadan
Correct answer is option 'D'. Can you explain this answer?
Which one of the following is a systemic insecticide ?
a)
Malathion
b)
Parathion
c)
Endrin
d)
Furadan
|
Dishani Sen answered |
The systemic insecticide is parathion
In which stage of cell division chromosomes are most condensed?- a)Prophase
- b)Metaphase
- c)Anaphase
- d)Telophase
Correct answer is option 'B'. Can you explain this answer?
In which stage of cell division chromosomes are most condensed?
a)
Prophase
b)
Metaphase
c)
Anaphase
d)
Telophase
|
Shreya Sengupta answered |
Chromosome is most condensed in metaphase
Chapter doubts & questions for 2009 - WBJEE Sample Papers, Section Wise & Full Mock Tests 2025 2025 is part of JEE exam preparation. The chapters have been prepared according to the JEE exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for JEE 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.
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