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West Bengal Joint Entrance Examination (WBJEE) For Selecting Candidates For Admission Undergraduate Level Engineering & Technological Courses Pursued In The Engineering & Technological Institutes Of West Bengal.

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 CO
2 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 WRONGinrelation to transgenic Bt cotton plant?
(A) Crop yield loss due to attack by Bacillus thuringiensisbacterium 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)

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 situmethod 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 bancrofticarried by Culexmosquito 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 NOTsuffer from
(A) cholera (B) malaria
(C) high blood pressure (D) hepatitis
Ans : (B)
Hint : Erythrocytic phase of Plasmodiumfails 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)


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