MBOSE Class 12 Question Paper 2020 for Bio Botany

Total No. of Printed Pages—4
HS/XII/Sc/Bio-Bot/OC/20

2020

BIO-BOTANY
( Old Course )

( Theory )

Full Marks : 35
Time : 1 12 hours

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

/41 [ P.T.O.

( 2 )

Group—E consists of 2 questions (Q. Nos. 16 and 17) of
5 marks each, with one alternative for each question, long-
answer type, to be answered in 70–80 words each.

GROUP—A

Choose and write the correct answer for the following : 1×4=4

1. A small opening at the apex of the integument is called
(a) nucellus
(b) funiculus
(c) hilum
(d) micropyle

2. The phenotypic ratio in complementary gene interaction
is
(a) 9 : 3 : 3 : 1
(b) 1 : 2 : 1
(c) 9 : 7
(d) 3 : 1

3. Butyric acid is produced by which bacterium?

(a) Clostridium
(b) Saccharomyces
(c) Penicillium
(d) Lactobacillus

HS/XII/Sc/Bio-Bot/OC/20/41 [ Contd.

( 3 )

4. The term, ‘ecology’ was coined by

(a) H. Reiter

(b) E. Munch

(c) A. G. Tansley

(d) Ernst Haeckel

GROUP—B

1
5. Write two advantages of cross-pollination. 2 ×2=1

6. Define epistasis. 1

7. Give the full form of LAB. 1

8. Define explant. 1

GROUP—C

9. Who discovered penicillin? Name the species from which
penicillin is obtained. 1+1=2

10. Mention the four components of soil. 2

11. What are genetically modified crops? Give examples.
1+1=2

12. Define hybridization. Name the different types of
hybridization. 1+1=2

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( 4 )

GROUP—D

13. Explain double fertilization with suitable diagrams. 2+1=3

Or

Give the characteristic features of anemophilous flowers. 3

14. List the functions of chromosomes. 3

15. What is single-cell protein? Explain how single-cell
protein is used in therapeutic and natural medicine.
1+2=3

GROUP—E

16. Describe briefly the stages of primary succession in a
hydrosere. 5
Or

Define population. Explain briefly the characteristics of
population. 1+4=5

17. Describe the mechanism of DNA replication with
suitable diagrams. 4+1=5
Or

Describe any five characteristics of genetic code. 5

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HS/XII/Sc/Bio-Bot/OC/20/41 20K—1130