Subject: Biology (Subjective)
Subject code: 138
Class-X
Subject code: 138
Class-X
Time: 2hrs. Marks:40
[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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