MBOSE Class 12 Question Paper 2018 for Bio Botany

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

2018

BIO-BOTANY
( Theory )

Full Marks : 35

Time : 1½ hours

General Instructions :

(i) Write all the answers in the Answer Script.
(ii) All questions are compulsory.
(iii) Attempt 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 (Nos. 1– 4) of 1 mark
each and is multiple-choice type.
Group—B consists of 4 questions (Nos. 5–8) of 1 mark
each, very short-answer type, to be answered in
1 sentence each.
Group—C consists of 4 questions (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 (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.

/50

( 2 )

Group—E consists of 2 questions (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. In angiosperms, functional megaspore develops into
(a) endosperm
(b) pollen sac
(c) embryo sac
(d) fruit

2. Penicillium roqueforti is used in the production of
(a) wine
(b) curd
(c) bread
(d) cheese

3. Inheritance of ABO blood group shows
(a) polygyny
(b) polyploidy
(c) multiple allelism
(d) incomplete dominance

( 3 )

4. In a food chain, deers are

(a) primary producers

(b) primary consumers

(c) secondary consumers

(d) decomposers

GROUP—B

5. Define apomixis. 1

6. What is mutation? 1

7. What is a callus? 1

8. Give the scientific name of baker’s yeast. 1

GROUP—C

9. What are antibiotics? Name the organism from which
Penicillin was first extracted. 1+1=2

10. Give four adaptive features of halophytes. ½×4=2

11. Write a note on Bt cotton. 2

12. What is single-cell protein? Give two examples. 1+1=2

( 4 )

GROUP—D

13. Explain different types of endosperms with suitable
diagrams. 2+1=3
Or
Give the characteristic features of anemophilous
flowers. 3

14. What is incomplete dominance? Work out a cross
between red flower and white flower of Mirabilis
jalapa to show incomplete dominance. Give the
phenotypic and genotypic ratios. 3

15. Write the applications of plant tissue culture. 3

GROUP—E
16. With the help of a diagram, explain the flow of energy
in an ecosystem. 1+4=5
Or
Describe the negative interactions amongst different
species. 5

17. Describe the mechanism of DNA replication with
suitable diagrams. 4+1=5
Or
Explain briefly the process of translation in
prokaryotes. 5

HHH

8K—5370/50 HS/XII/Sc/Bio-Bot/18