MBOSE Class 12 Question Paper 2018 for Bio Zoology

Total No. of Printed Pages—4
HS/XII/Sc/Bio-Zoo/18

2018

BIO-ZOOLOGY
( Theory )

Full Marks : 35
Time : 1½ hours

General Instructions :
(i) The figures in the margin indicate full marks for the
questions.
(ii) All questions are compulsory.
(iii) Write all the answers in the Answer Script.
(iv) This question paper consists of 5 (five) Groups—A, B, C,
D and E.
(v) Attempt all parts of a Group serially in one place.
Group—A consists of 4 questions (multiple-choice type).
Each question (Q. Nos. 1–4) carries 1 mark.
Group—B consists of 4 questions (very short-answer
type). Each question (Q. Nos. 5–8) carries 1 mark and to
be answered in one sentence.
Group—C consists of 4 questions (short-answer type—I).
Each question (Q. Nos. 9–12) carries 2 marks and to be
answered in 20–30 words.
Group—D consists of 3 questions (short-answer type—II).
Each question (Q. Nos. 13–15) carries 3 marks with
alternatives to be answered in 30–40 words.

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( 2 )

Group—E consists of 2 questions (long-answer type).
Each question (Q. Nos. 16 and 17) carries 5 marks with
alternatives to be answered in 70–80 words.
GROUP—A
Choose and write the correct answer of the following : 1×4=4

1. All antigens
(a) are microorganisms
(b) are not microorganisms
(c) react against transplant
(d) do not react against transplant

2. Tumor-causing virus has
(a) t-onc genes
(b) c-onc genes
(c) v-onc genes
(d) tv-onc genes

3. The rate of oxygen consumption is higher in
(a) polluted water
(b) unpolluted water
(c) spring water
(d) tap water

4. In National Parks
(a) no human activity is allowed
(b) limited human activities are permitted
(c) a large number of human activities is allowed
(d) people are an integral component

( 3 )

GROUP—B
5. Define amphimixis. 1

6. What is contraception? 1

7. What do you understand by the term ‘genome’ ? 1

8. What are restriction enzymes? 1

GROUP—C

9. What is rete testis? 2

10. What are vestigeal organs? Give two examples. 2

11. Why is haemophilia called bleeder’s disease? 2

12. What is cryopreservation? 2

GROUP—D

13. What is fertilization? State its significance. 1+2=3
Or
Differentiate between oogenesis and
spermatogenesis. 3

14. Name the causative agent of malaria. Explain the
mode of infection of malaria. 1+2=3
Or
What is cancer? Differentiate between benign and
malignant tumor. 1+2=3

( 4 )

15. Write down the principle involved in DNA finger-
printing. 3
Or
List three applications of recombinant DNA
technology. 3

GROUP—E

16. Give the salient features of the theory of Natural
Selection proposed by Charles Darwin. 5
Or
What are connecting links? Is Archaeopteryx a
connecting link? Give reasons in support of your
answer. 1+4=5

17. State Mendel’s law of independent assortment and
explain it with the help of a cross between a
homozygous yellow round (YYRR) and a green
wrinkled (yyrr) pea plants. What will be the
phenotype of the F1 and F2 progenies? (1+2)+2=5
Or
In pea, tall vine is dominant over dwarf. Based on a
cross between homozygous tall and homozygous
dwarf pea plants, show the following :
(i) Genotype and phenotype of parents
(ii) Genotype and phenotype of F1 and F2 progenies
(iii) Phenotype ratio of F2 progenies 2+2+1=5

HHH

8K—5370/51 HS/XII/Sc/Bio-Zoo/18