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NCERT 7th Class (CBSE) Science: Chemical and Chemical Changes

8th Science Annual Examination (2018-19)

8th Science Annual Examination (2018-19)

School Name: Venkateshwar Global School, Sector 13, Rohini, Delhi 110085 India
Time: 3 hours
M.M: 80
Subject: Science
Class: 8
Date: 25/02/2019

General Instructions:

  • All questions are compulsory.
  • Read the paper carefully and write all your answers only on the Answer Sheets provided separately.
  • Draw the diagrams neatly only with a pencil.

Very short answer questions: [1×3=3]

Question: 1. Which gland is known as the master switch board?

Question: 2. What is menopause?

Question: 3. Write the ionic form of Mg and O.

Short answer questions (I): [2×6=12]

Question: 4. Briefly explain how a bats catches its prey.

Question: 5. With the help of a simple diagram explain what happens to light when it passes from a denser medium to a rarer medium.

Question: 6. Who is responsible for the gender of the baby? Explain.

Question: 7. Give two points of difference between chloroplast and chromoplast.

Question: 8. The elephant weighs 10,000 N stands on one foot of area 1000 cm². How much pressure would it exert on the ground?

Question: 9. Explain why hydrogen is not used as a domestic fuel?

Short answer questions (II): [3×10=30]

Question: 10. Two tyres of a tractor are very wide and huge. Why? What is the SI unit unit of pressure?

Question: 11. Where is image formed in our eyes when we seen (i) a nearby object (ii) a far off object. Explain.

Question: 12. How does shrillness or pitch is affected by frequency? Explain giving examples.

Question: 13. Illustrate the harmful effects of excessive use of fertilizers, pesticides, insecticides etc. on the quality of soil.

Question: 14. What is animal husbandry? List some food products that we get from animals.

Question: 15. How is rapid combustion different from spontaneous combustion? Explain giving examples.

Question: 16. Are the cells present in your body eukaryotic? Give reason for your answers.

Question: 17. Why are liquid fuels better than solid fuels? (three points)

Question: 18. Study the circuit carefully. Will the bulb glow? Why? Will it glow if lemon juice is replaced with salt water? [1+1+1]

Bulb glow

Question: 19. Explain reproduction in hydra with the help of diagrams.

Question: 20. Explain any three physical changes that take place in females during puberty.

Long answer questions: [5×7=35]

Question: 21. Briefly explain how we extract petrol from petroleum. Draw diagram to support your answer.

Question: 22. (a) Identify A,B,C,D,E and F
(b) What is the function of E and F

 

Stomata

Question: 23. List different ways of sowing seeds. Explain any one method in detail. What precautions should we take while sowing seeds?

Question: 24. (a) Identify the process taking place in the given cell.
(b) Identify the anode and cathode.
(c) Name the electrolyte.
(d) What would happen if the thin plate is replaces with a wooden stick?

anode and cathode

Question: 25. Write a short note on bacteria. Consider the following points. [2+1+1+1] Cell structure, habitat, uses and diseases caused

Question: 26. (a) Differentiate between zygote, embryo and foetus.
(b). Can a female with blocked tubes given birth to a child? Explain.

Question: What are endocrine glands, Name any two endocrine glands. Explain their functions. On a rough outline of human body show their location. [1+1+2+1]

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