MBOSE Class 12 Question Paper 2019 for Bio Zoology

Total No. of Printed Pages—4
HS/XII/Sc/Bio-Zoo/19

2019

BIO-ZOOLOGY
( 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) The figures in the margin indicate full marks for the
questions.
(v) 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.

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( 2 )

GROUP—A
Choose and write the correct answer of the following : 1×4=4

1. Immunoglobulins are
(a) antigens
(b) antiseptics
(c) antibiotics
(d) antibodies

2. The process of enrichment of nutrients in water
bodies and then loss of species diversity is known as
(a) biological magnification
(b) eutrophication
(c) algal bloom
(d) All of the above

3. Which of the following drugs is a type of
hallucinogen?
(a) Valium
(b) LSD
(c) Opium
(d) Cocaine

4. Which one of the following is an example of in situ
conservation?
(a) Botanical garden
(b) Zoological park
(c) National park
(d) Cryopreservation

( 3 )

GROUP—B
5. Define metastasis. 1

6. What is the full form of VNTR? 1

7. What happens to a DNA molecule when a restriction
enzyme is added to it, under appropriate conditions? 1

8. Name any one hormone released by placenta during
pregnancy. 1

GROUP—C

9. How is polyspermy prevented during fertilisation? 2

10. What are hot spots of biodiversity? Name any two hot
spots in India. 1+1=2

11. What are homologous organs? Give an example. 1+1=2

12. Why is haemophilia also known as bleeder’s disease? 2

GROUP—D

13. Define spermatozoa. Draw a labelled diagram of a
mammalian sperm. 1+2=3

14. Define vaccine. How does vaccination help in
immunity of the body? 1+2=3

15. What is human genome project? What are the main
aims of the project? 1+2=3

( 4 )

GROUP—E

16. State and explain Mendel’s law of segregation with
the help of a suitable cross. 1+4=5
Or
Describe the salient features of Lamarck’s theory of
inheritance of acquired characters. 5

17. What is oogenesis? With the help of suitable
diagram, describe the steps involved in this process.
1+3+1=5
Or
Define menstrual cycle. Describe the various phases
of menstrual cycle. 1+4=5

HHH

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