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June 24th, 2016, 09:14 AM
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Re: WBJEE Solved Sample Papers

Hey as per your demand here I am providing you WBJEE Solved Sample Papers for your practice

Here I am giving you WBJEE Solved Sample Papers

WBJEE sample paper
1. Passage cells help in
(A) transport of water towards pericycle (B) transport of water towards epiblema
(C) absorption of water from soil (D) passage of CO2 towards stomata
Ans : (A)
Hint : Passage cells are endodermal cells lacking casparian strip which allow comparatively faster movement of
water into stele.
2. Medullary rays are tissues made up of
(A) phloem parenchyma (B) xylem parenchyma
(C) sieve tube (D) sclerenchyma
Ans : (B)
Hint : Medullary rays or Wood rays are made up of xylem parenchyma.
3. An allosteric inhibitor of the enzyme acts by binding to the
(A) substrate (B) product
(C) catalytic site of the enzyme (D) non-catalytic site of the enzyme
Ans : (D)
Hint : Allosteric inhibitor attaches with non catalytic site of enzyme called ‘Allosteric site’
4. A set of genes will be in a complete linkage when the progeny phenotypes for parental (P) and recombinant (R) types
are
(A) P = 0%, R = 100% (B) P = 50%, R = 50%
(C) P < 50%, R > 50% (D) P = 100%, R = 0%
Ans : (D)
Hint : Since there is complete linkage, parental combinations are 100% and recombinant types are 0%
5. Which one of the following statements is WRONG in relation to transgenic Bt cotton plant?
(A) Crop yield loss due to attack by Bacillus thuringiensis bacterium is reduced
(B) Crop yield loss due to attack by lepidopteran insect pests is reduced
(C) The use of chemical insecticides in the cotton field is minimized
(D) Better quality cotton is produced
Ans : (A)
Hint : Bacillus thuringiensis does not attack cotton plants and hence cannot reduce crop loss.
6. Which one of the following natural polymers is found both in insects and fungi?
(A) pectin (B) chitin
(C) cellulose (D) suberin
Ans : (B)
Hint : Chitin is a natural structural polysaccharide, which is found in both insects and fungi.
7. Which one of the followings in an in situ method of biodiversity conservation?
(A) national park (B) botanical garden
(C) zoological garden (D) scientific laboratory
Ans : (A)
Hint : Botanical garden, zoological parks and scientific laboratory are ex situ methods of conservation.
8. Nucleosome contains
(A) only histone protein (B) both DNA and histone protein
(C) only DNA (D) both DNA and RNA
Ans : (B)
Hint : Nucleosome contains both DNA and histone protein.
9. Which one of the following matching pairs is WRONG?
(A) Mollusca-Pseudocoel (B) Cnidaria-Nematocyst
(C) Annelida-Chloragogen cells (D) Echinodermata-Water vascular system
Ans : (A)
Hint : Mollusca has schizocoelom [true coelom], while Aschelminthes has pseudocoelom.
10. Which one of the following matching pairs is WRONG?
(A) Shell fish-Pisces (B) Silver fish-Arthropoda
(C) Cuttle fish-Mollusca (D) Star fish-Echinodermata
Ans : (A)
Hint : Shell fish are edible aquatic invertebrates, including various species of molluscs, crustaceans and
echinoderms.
11. Third stage larva of Wuchereria bancrofti carried by Culex mosquito is called
(A) cysticercus (B) merozoite
(C) microfilariae (D) trophozoite
Ans : (C)
Hint : Third stage of microfilariae are larva of Wuchercria bancrofti, infective to human.
12. Persons suffering from sickle cell anaemia normally DO NOT suffer from
(A) cholera (B) malaria
(C) high blood pressure (D) hepatitis
Ans : (B)
Hint : Erythrocytic phase of Plasmodium fails to complete in sickle shaped RBCs, hence persons with sickle cell
anaemia do not suffer from malaria.
13. Two related but geographically isolated species are known as
(A) sibling species (B) sympatric species
(C) taxonomic species (D) allopatric species
Ans : (D)
Hint : In allopatric speciation, two related species are isolated by geographical barriers.
14. Which hormone is responsible for reabsorption of water in kidney?
(A) ADH (B) STH
(C) ACTH (D) GTH
Ans : (A)
Hint : ADH is secreted under water stressed condition. It helps in reabsorption of more water in kidney and maintain
body fluid volume.
15. Wildlife Protection Act India was implemented in the year
(A) 1982 (B) 1988
(C) 1972 (D) 1970
Ans : (C)
Hint : Wildlife protection Act, India was implemented in year 1972.
16. All of the following symptoms are found in jaundice EXCEPT
(A) disorders of hepato-biliary system
(B) abnormal secretion of pancreatic and gastric juices
(C) bile duct obstruction
(D) anaemia
Ans : (B)
Hint : Pancreatic and gastric secretions remain unaffected during obstructive and haemolytic jaundice.
17. The hormone that stimulates the release of pancreatic juice is
(A) secretin (B) glucagon
(C) inhibin (D) insulin
Ans : (A)
Hint : Secretin stimulates the release of pancreatic juice, primarily bicarbonates.
18. Which one of the following combinations acts as a usual antigen binding site of an antibody?
(A) variable regions of a light and another heavy chain
(B) variable regions of two light chains
(C) variable regions of two heavy chains
(D) variable region of a heavy chain and constant region of a light chain
Ans : (A)
Hint : Antigen binding site [paratope] in an antibody includes variable regions of both heavy and light chains.
19. Which one of the followings is a causative agent of plague?
(A) Shigella flexneri (B) Bordetella pertusis
(C) Staphylococcus aureus (D) Yersinia pestis
Ans : (D)
Hint : Plague is bacterial disease caused by Yersina pestis.
20. Which one of the following hormones is responsible for uterine contraction during parturition?
(A) relaxin (B) vasopressin
(C) oxytocin (D) prolactin
Ans : (C)
Hint : Oxytocin helps in contraction of smooth muscles of uterine myometrium.
21. Melatonin is produced from
(A) pineal gland (B) adrenal gland
(C) parathyroid gland (D) ovary
Ans : (A)
Hint : Melatonin hormone is tryptophan derivative secreted by pineal gland.
22. Nitrogenase enzyme is a
(A) magnesium-iron protein (B) molybdenum-iron protein
(C) iron-copper protein (D) nickel-iron protein
Ans : (B)
Hint : Nitrogenase enzyme is a Mo-Fe protein.
23. Necrosis (die-back) of the tip of young leaves is caused due to the deficiency of
(A) iron (B) manganese
(C) zinc (D) copper
Ans : (D)
Hint : Necrosis (die-back) of tip of young leaves is due to deficiency of copper.
24. Guttation is a process of loss of water in
(A) liquid form containing dissolved minerals (B) liquid form without dissolved minerals
(C) vapour form with minerals (D) vapour form without minerals
Ans : (A)
Hint : Guttation is a process of loss of water in liquid form containing dissolved minerals through hydathodes.
25. Which one of the followings is WRONG for meiosis ?
(A) It leads to formation of sister chromatids
(B) It occurs in diploid cell
(C) It occurs in haploid cell
(D) It occurs by splitting of centromeres and separation of sister chromatids
Ans : (C)
Hint : Meiosis does not occur in haploid cells.
26. Which one of the following combination of all three fatty acids are essential for human beings ?
(A) oleic acid, linoleic acid and linolenic acid
(B) palmitic acid, linoleic acid and arachidonic acid
(C) oleic acid, linoleic acid and arachidonic acid
(D) linoleic acid, linolenic acid and arachidonic acid
Ans : (D)
Hint : These are unsaturated essential fatty acids, taken as supplement from plant sources.
27. Which one of the following information is essential to determine the genetic map distance between two genes located
on the same chromosome ?
(A) length of the particular chromosome
(B) number of genes present in the particular chromosome
(C) number of nucleotides in the particular chromosome
(D) percentage of crossing over or recombinant frequency between the two genes
Ans : (D)
Hint : Recombination frequency or percentage of crossing over between two genes gives an idea of distance between
adjacent genes.
28. What will be the percentage of guanine in a DNA molecule having 20% adenine ?
(A) 20% (B) 30%
(C) 40% (D) 60%
Ans : (B)
Hint : According to Chargaff’s rule ; A = T ; C = G
If the % of A = 20%, therefore T = 20% or, A + T = 40%. Therefore, G + C = 60% and hence G = 30%
29. Which one of the following group of animals is homeothermic ?
(A) reptiles (B) amphibians
(C) birds (D) fishes
Ans : (C)
Hint : Birds and mammals can maintain their body temperature irrespective of external temperature variation.
30. Neoteny refers to
(A) development of gonads (B) moulting
(C) metamorphosis (D) retention of larval traits in the adult body
Ans : (D)
Hint : Neoteny refers to retention of larva traits [e.g. External gills] in adult Tiger Salamander [Ambystoma]
31. The overlapping zone in between two ecosystems is known as
(A) ecozone (B) biotope
(C) ecotone (D) buffer zone
Ans : (C)
Hint : The overlapping zone in between two ecosystems is known as ecotone.
32. The animal species controlling the ecosystem functioning is known as
(A) edge species (B) pioneer species
(C) keystone species (D) umbrella species
Ans : (C)
Hint : The animal species controlling the ecosystem functioning is known as keystone species.
33. Phenomenon involving increase in concentration of non-degradable pollutants from lower to higher trophic levels is
called
(A) biomagnification (B) bioaccumulation
(C) biodegradation (D) bioinvasion
Ans : (A)
Hint : Phenomena involving increase in concenteration of non-biodegradable pollutants from lower to higher tropic
levels is called biomagnification.
34. Which one of the following animals is uricotelic ?
(A) Lizard (B) Camel
(C) Toad (D) Rohu fish
Ans : (A)
Hint : Excretory product in lizard is uric acid.
35. Zymogenic cells of gastric gland secrete
(A) pepsinogen (B) trypsin
(C) pepsin (D) chymotrypsin
Ans : (A)
Hint : Zymogenic cells of gastric glands secrete inactive pepsinogen, activated into pepsin by HCl.
36. During entry into the ovum, acrosome of sperm releases
(A) hyaluronidase (B) alkaline phosphatase
(C) acid phosphatase (D) carbonic anhydrase
Ans : (A)
Hint : Hyaluronidase dissolves hyaluronic acid [cementing material] of corona radiata around ovum.
37. The epithelium found in the inner linings of stomach and intestine is
(A) columnar (B) squamous
(C) stratified (D) pseudo-stratified
Ans : (A)
Hint : Inner lining of stomach and intestine is made of simple columnar epithelium.
38. Central dogma in molecular biology is
(A) RNA  DNA  Protein (B) DNA  RNA  Protein
(C) RNA  Protein  DNA (D) DNA  Protein RNA
Ans : (B)
Hint : Central dogma in molecular biology given by Francis Crick states that : DNA  RNA  Protein
39. Which one of the followings is the functional unit of hearing ?
(A) utricle (B) organ of Zuckerkandl
(C) organ of Corti (D) vestibular apparatus
Ans : (C)
Hint : Organ of Corti is the auditory sensory part in the cochlea.
40. Whcih one of the followings is NOT a refractive medium of the eye ?
(A) lens (B) vitreous humour
(C) aqueous humour (D) pupil
Ans : (D)
Hint : Pupil is an aperture through which light enter into eyes. Other parts are refractive media.
41. The heart is covered by
(A) epicardium (B) pericardium
(C) supracardium (D) endocardium
Ans : (B)
Hint : Heart is covered by double layered Pericardium.
42. What is the stroke volume of an adult human heart?
(A) 50 ml (B) 70 ml
(C) 90 ml (D) 100 ml
Ans : (B)
Hint : 70 ml blood is ejected by left ventricle during each ventricular systole, called stroke volume.
43. Which one of the following cocci appears like grapes under microscope?
(A) streptococci (B) diplococci
(C) staphylococci (D) pneumococci
Ans : (C)
Hint : Arrangement of cocci looks like an irregular bunch of grapes representing Staphylococci.
44. Which one of the following components of urine in a healthy human DOES NOT differ much in concentration from that
of blood plasma?
(A) NH4
+ (B) K+
(C) Na+ (D) SO4
2–
Ans : (D)
Hint : SO4
2– is a non-threshold substance.
45. Antibodies produced by a group of identical B-cells against a single epitope of an antigen is called
(A) polyclonal antibodies (B) monoclonal antibodies
(C) anti-hapten antibodies (D) somaclonal antibodies
Ans : (B)
Hint : Monoclonal antibodies are produced by Hybridoma technique.
46. Vernalization promotes flowering by
(A) low temperature (B) high temperature
(C) prolonged photoperiod (D) short photoperiod
Ans : (A)
Hint : Vernalization is the acquisition of a plant’s ability to flower in the spring by exposure to prolonged cold of winter.
47. C4 pathway is advantageous over C3 pathway in plants as it
(A) occurs in relatively low CO2 concentration (B) uses more amount of water
(C) occurs in relatively low O2 concentration (D) is less efficient in energy utilization
Ans : (A)
Hint : C4 plants, due to double carboxylation can utilize even relatively low CO2 concentration.
48. TCA cycle enzymes are located in
(A) cristae (B) outer membrane
(C) mitochondrial matrix (D) mitochondrial intermembrane space
Ans : (C)
Hint : TCA cycle (Krebs’ cycle) enzymes are located in mitochondrial matrix.
49. During waste water treatment, trickling filter is used for
(A) primary treatment (B) secondary aerobic treatment
(C) secondary anaerobic treatment (D) tertiary treatment
Ans : (B)
Hint : During waste water treatment, trickling biofilter, is a biological reactor that operates under aerobic conditions
within the waste water treatment plant.
50. The apoplast is located
(A) outside the plasma membrane (B) in the entire cytosol
(C) on both sides of plasma membrane (D) in the plastidial content
Ans : (A)
Hint : Apoplast is the free diffusional space outside the plasma membrane formed by cell wall and intercellular space
between cells.

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