MBOSE Class 12 Question Paper 2019 for Bio Botany

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

2019

BIO-BOTANY
( 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 (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.

/65

( 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. Sporopollenin occurs in the wall of
(a) egg cell
(b) pollen grain
(c) synergids
(d) antipodal cells

2. Which of the following is required as inducer for the
expression of lac operon?
(a) Lactose
(b) Galactose
(c) Glucose
(d) Lactose and galactose

3. Emasculation is the process of removal of
(a) stigma
(b) stamen
(c) carpel
(d) petals

( 3 )

4. A grazing food chain cannot begin in the absence of

(a) carnivores

(b) herbivores

(c) producers

(d) decomposers

GROUP—B

5. Write two important characteristics of anemophilous
flowers. ½×2=1

6. Define heterosis. 1

7. Define totipotency. 1

8. What are mutagens? 1

GROUP—C

9. What are transgenic plants? Give two examples. 1+1=2

10. What is biogas? Name the principal organism
involved in its production. 1+1=2

11. Define symbiosis. Give two examples. 1+1=2

12. Name the bacterium responsible for the large holes
seen in ‘Swiss cheese’. What are those holes due to?
1+1=2

( 4 )

GROUP—D

13. Draw a well-labelled diagram of an angiospermic
ovule showing porogamous type of pollen
germination. 3

14. What are complementary genes? Explain with the
help of an example. 1+2=3

15. Give an account of the production of human insulin
in transgenic organism. 3
Or
Write the technique of plant tissue culture. 3

GROUP—E
16. Define transcription. Explain the process of
transcription in bacteria with suitable diagram.
1+3+1=5
Or
Explain the chromosomal theory of inheritance. 5

17. Briefly explain the biotic components of an
ecosystem. 5
Or
What are ecological pyramids? Describe briefly
different types of ecological pyramids with suitable
diagrams. 1+3+1=5

HHH

HS/XII/Sc/Bio-Bot/19/65 K9—5220