CBSE Board Class 8 Science Sample Papers 2008

SAMPLE PAPER 2008
CLASS 8 SCIENCE


1.List the changes in the body that take place at the time of puberty.

2. With schematic figure explain the sex determination in human being.

3. Explain how deforestation leads to reduced rainfall?

4. What are weeds? How do they affect crop plants? Write two ways of removing themfrom the field.

5. Give three important differences between manure and fertilizers.

6. ‘Avoid Plastics as far as possible’. Comment on this advice.

7. One day Reeta went to a jeweler’s shop with her mother. Her mother gave an old gold jewellery to the goldsmith to polish. Next day when they brought the jewellery back,they found that there was a slight loss in its weight. Can you suggest the reason for theloss in weight?

8. Expand PCRA. Give four suggestions how to save petrol/diesel while driving.

9. Give reasons:
a)Water is not used in extinguishing fire involving electrical equipments
b)Luminous zone of a flame gives black soot.25. Give one difference between
c)Viviparous and Oviparous
d)External and Internal fertilization.
e)Sperm and Ovum

10. Answer the following:
a.Define force

b.What are the changes observed when force is applied on an object.

c.Give example of two contact forces and two non contact forces.

11. Draw a neat diagram of plant cell and label five key parts to identify it as a plant cell.

12. What do you mean by asexual reproduction? With neat diagram explain any twomethods of this type of reproduction in animals.
OR
a.Define Metamorphosis.
b.With diagram explain the life cycle of frog.

13. Give reasons for the following:

a.Aluminium foils are used to wrap food items.

b.Immersion rods are made up of metallic substances.

c.Copper cannot replace zinc from its salt solution.

d.Phosphorous is stored in water.

e.The bells in temples are made up of metals

14. Answer the following

a.What are antibiotics? Give example of two commonly known antibiotics.

b.What are antibodies? How are they important for us?

c.Give example of two vaccine preventable diseases in children.

15. Why are fossil fuels considered as the most important sources of energy  today?

16. What are the advantages of using natural gas as a fuel?

17. Which planet is known as morning and evening star? Why is it so called?

18. What are the asteroids? Differentiate between meteors and meteorites

19. What is Mensuration? Under what circumstances can twins be born in humans?

20. How is zygote developing in uterus?

21. If natural resources are renewable still get exhausted. Discuss with two examples