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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
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
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.
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 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 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
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
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
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
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.
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
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
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
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.
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.
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 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
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
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 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
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.
Which element is cause of etai etai disease- a)Hg
- b)Pb
- c)Cd
- d)As
Correct answer is option 'C'. Can you explain this answer?
Which element is cause of etai etai disease
a)
Hg
b)
Pb
c)
Cd
d)
As
|
Juhi Chopra answered |
Etai etia is caused by Cd
The Genetic deficiency of ADH-receptor leads to- a)Diabetes mellitus
- b)Glycosuria
- c)Diabetes Insipidus
- d)Nephrogenic Diabetes
Correct answer is option 'D'. Can you explain this answer?
The Genetic deficiency of ADH-receptor leads to
a)
Diabetes mellitus
b)
Glycosuria
c)
Diabetes Insipidus
d)
Nephrogenic Diabetes
|
|
Amit Kumar answered |
Nephrogenic diabetes is due to genetic deficiency of ADH-receptor linked to x-chromosome.
Net yield of aerobic respiration during Krebs’ cycle per glucose molecule is :- a)2 ATP molecules
- b)8 ATP molecules
- c)36 ATP molecules
- d)38 ATP molecules
Correct answer is option 'A'. Can you explain this answer?
Net yield of aerobic respiration during Krebs’ cycle per glucose molecule is :
a)
2 ATP molecules
b)
8 ATP molecules
c)
36 ATP molecules
d)
38 ATP molecules
|
|
Devika Roy answered |
Net yield of 2ATP for two Krebs’ cycle (1 glucose molecule) is produced at SLP
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).
Chromosomes can be stained with one of the following chemicals- a)Acetocarmine
- b)Safranine
- c)Light green
- d)Eosin
Correct answer is option 'A'. Can you explain this answer?
Chromosomes can be stained with one of the following chemicals
a)
Acetocarmine
b)
Safranine
c)
Light green
d)
Eosin
|
|
Ipsita Kumar answered |
Acetocarmine is used to stain chromosome
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.
Pellagra is caused due to deficiency of the vitamin :- a)Thiamin
- b)Niacin
- c)Pyridoxin
- d)Biotin
Correct answer is option 'B'. Can you explain this answer?
Pellagra is caused due to deficiency of the vitamin :
a)
Thiamin
b)
Niacin
c)
Pyridoxin
d)
Biotin
|
|
Niharika Bose answered |
Pellagra is caused by Niacin (nicotinic acid)
Ornithorhynchus is an example of :- a)Dinosaur
- b)Monotreme mammal
- c)Marsupial mammal
- d)Eutherian mammal
Correct answer is option 'B'. Can you explain this answer?
Ornithorhynchus is an example of :
a)
Dinosaur
b)
Monotreme mammal
c)
Marsupial mammal
d)
Eutherian mammal
|
|
Amit Kumar answered |
Ornithorhynchus (Duckbilled platypus) is monotreme.
Osteomalacia is a disease caused by the deficiency of —- a)Calciferol
- b)Retinol
- c)Tocopherol
- d)Phylloquinone
Correct answer is option 'A'. Can you explain this answer?
Osteomalacia is a disease caused by the deficiency of —
a)
Calciferol
b)
Retinol
c)
Tocopherol
d)
Phylloquinone
|
Krish Das answered |
Osteomalacia is caused by calciferol deficiency in body
Vascular tissue in higher plants develop from which of the following :- a)Procambium
- b)Protoderm
- c)Periblem
- d)Cortex
Correct answer is option 'A'. Can you explain this answer?
Vascular tissue in higher plants develop from which of the following :
a)
Procambium
b)
Protoderm
c)
Periblem
d)
Cortex
|
|
Amit Kumar answered |
Procambium forms vascular tissue in higher plants
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
Choose the minor carp from the following :- a)Cyprinus carpio
- b)Labeo calbasu
- c)Labeo bata
- d)Ctenopharyngodon idella
Correct answer is option 'C'. Can you explain this answer?
Choose the minor carp from the following :
a)
Cyprinus carpio
b)
Labeo calbasu
c)
Labeo bata
d)
Ctenopharyngodon idella
|
Pragati Dey answered |
Laveo bata is a minor carp., it size is smaller and growth rate slower
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
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
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
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
T-lymphocyte is produced in- a)Bone marrow
- b)Spleen
- c)Pancreas
- d)Thymus
Correct answer is option 'A'. Can you explain this answer?
T-lymphocyte is produced in
a)
Bone marrow
b)
Spleen
c)
Pancreas
d)
Thymus
|
Sneha Sarkar answered |
T-lymphocyte are produced in bone marrow but mature in thymus
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
Which of the following does not act as a neurotransmitter ?- a)Acetyl-choline
- b)Glutamic acid
- c)Epinephrine
- d)Tyrosine
Correct answer is option 'D'. Can you explain this answer?
Which of the following does not act as a neurotransmitter ?
a)
Acetyl-choline
b)
Glutamic acid
c)
Epinephrine
d)
Tyrosine
|
|
Isha Choudhury answered |
Tyrosine is not a neurotransmitter, it is an amono acid.
Chapter doubts & questions for 2009 - WBJEE Sample Papers, Section Wise & Full Mock Tests 2026 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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