Subject: Biology (Subjective) Subject
code: 138
Class-X
[N.B: The figures in the margin indicate full marks. Answer
with labelled diagram where ever necessary. Different parts of a question will
have to answer serially.]
Group-A Botany
Answer any
three
1. (a) What is phytohormone? 1
(b) Describe the role of auxins and
gibberellins in growth and development of plants. 4
2. (a) Mention the importance of coconut trees. 3
(b) Write down four differences between
virus & bacteria. 2
3. (a) Describe about vernalization? 2
(b) Draw labelled diagram of a stamen and
write the function of stamen. 3
4. (a) Describe the importance of
fertilization. 2
(b) With example describe the
characteristics of hydrophilous flowers. 3
Group-B Zoology
5. (a) What is called binary fission? 1
(b) Describe how the amoeba reproduces by
the process of binary fission. 4
6. (a) Where is blood? 1
(b) Write down four differences between
artery and vein? 4
7. (a) Write down the rules of modern
classification. 3
(b) Classify human upto species level. 2
8. (a) What do you mean by parasite and how
many they are? 2
(b) Write down the digestive system of Round
worm in brief. 3
Group-C Combined
Answer any two
9. (a) Write down the chemical composition and
function of chromosome. 2
b) Describe
the prometaphase and anaphase stages of mitosis cell division. 3
10. a) Where is Sundarban situated? 2
b) Describe
the characteristics of this forest? 3
11. (a) What is green house? 1
b) Describe
the green house effect? 4
12. a) What do you mean by economic biology? 1
b) Write
down the importance of honey bee. 4
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