MBOSE Class 12 Question Paper 2020 for Bio Zoology

Total No. of Printed Pages—4
HS/XII/SC/Bio-Zoo/OC/20

2020

BIO-ZOOLOGY

( Old Course )

( Theory )

Full Marks : 35
Time : 1½ hours
General Instructions :
(i) Write all the answers in the Answer Script.
(ii) Attempt all parts of a Group serially in one place.
(iii) All questions are compulsory.
(iv) This question paper consists of 5 (five) Groups—A, B, C,
D and E.
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 and to be answered in 30-40 words.
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 60-80 words.

/42 [ P.T.O.

( 2 )

GROUP—A

Choose and write the correct answer of the following :

1. Manas Wildlife Sanctuary is located in 1

(a) Meghalaya

(b) Assam

(c) West Bengal

(d) Rajasthan

2. What causes the loss of biodiversity? 1

(a) Habitat degradation

(b) Invasion of non-native species

(c) Pollution

(d) All of the above

3. Which of the following is a terminal method of
contraception? 1

(a) IUDS

(b) Contraceptive pills

(c) Lactational amenorrhea

(d) Tubectomy

HS/XII/SC/Bio-Zoo/OC/20/42 [ Contd.

( 3 )

4. Antibodies are produced by 1

(a) leucocytes

(b) lymphocytes

(c) erythrocytes

(d) platelets

GROUP—B

5. What is the full form of AIDS? 1

6. What is colostrum? 1

7. What is the role of plasmid in genetic engineering? 1

8. What is genome? 1

GROUP—C

9. What is capacitation with reference to sperm? 2

10. What is meant by ‘ontogeny repeats phylogeny’? 2

11. State Mendel’s law of independent assortment. 2

12. What is greenhouse effect? Name any greenhouse gas. 2

HS/XII/SC/Bio-Zoo/OC/20/42 [ P.T.O.

( 4 )

GROUP—D

13. Define parturition. Name the hormones involved in the
process and their sources. 3

14. Briefly describe DNA fingerprinting. 3

15. Differentiate between benign and malignant tumours. 3

GROUP—E

16. What is fertilization? Where does it take place in the
human female? What are the significances of this
developmental process? 5

Or

Define cleavage. Describe the process of cleavage in
humans with well-labelled diagrams. 5

17. What are the main postulates of the ‘theory of natural
selection’ proposed by Charles Darwin? 5

Or

What are the possible blood groups of children born from
a man with blood group AB and a woman with blood
group O? Illustrate with the help of a cross. 5



HS/XII/SC/Bio-Zoo/OC/20/42 20K—1130