CBSE - X
CBSE X
SCIENCE PAPER 2008.
(ALL INDIA)
Time allowed: 2 hours 30 mins; Maximum Marks: 60
| General Instructions: | |
| 1) | The question paper comprises of two sections A and B. You are to attempt both sections. |
| 2) | All questions are compulsory. |
| 3) | There is no overall choice. However, internal choice has been provided in all the three questions of five marks category. Only one option in such questions is to be attempted. |
| 4) | All questions of section A and all questions of section B are to be attempted separately. |
| 5) | Questions 1 to 6 in section A and 17 to 19 in section B are short answer type questions. These carry one mark each. |
| 6) | Questions 7 to 10 in section A and 20 to 24 in section B are short answer types questions and carry two marks each. |
| 7) | Questions 11 to 14 in section A and 25 to 26 in section B are also short answer type questions and carry three marks each. |
| 8) | Questions 15 and 16 in section A
and question 27 in section B are long answer type
questions and carry five marks each.
|
Question 17
17. Which one of the following is a renewable resource? Natural gas, Petroleum, Ground water, Coal.
Question 18
18. What is the effect of DNA copying which is not perfectly accurate on the reproduction process?
Question 19
Question 20
20. List any four characteristics of biogas on account of which it is considered an ideal fuel.
Question 21
21. Discuss one limitation each for the extracting of energy from:
(a)winds (b)tides.
Question 22
22. Write one function each of the following components of the transport system in
human beings:
(a)Blood vessels (b)Blood platelets (c)Lymph (d)Heart
Question 23
23. Name one sexually transmitted disease each caused due to bacterial infection and viral infection. How can these be prevented?
Question 24
24. What are fossils? What do they tell about the process of evolution?
Question 25
25.How is ozone formed in the upper atmosphere? Why is damage to ozone layer a cause of concern to us? What causes this damage?
Question 26
26. How are oxygen and carbon dioxide transported in human beings? How are lungs designed to maximise the area for exchange of gases?
Question 27
27.
(a)Draw the structure of a neuron and label the following on it:
Nucleus, Dendrite, Cell body and Axon.
(b)Name the part of neuron:
(i)where information is acquired.
(ii) through which information travels as an electrical impulse.
(Or)
(a)What
is (i) phototropism and (ii) geotropism? With labelled diagrams describe
an activity to show that light and gravity change the direction that plant
parts
grow in.
(b)Mention the role of each of the following plant hormones:
(i) Auxin (ii) Abscisic acid
Section A |