Class 7 Science

Final Series Assignment 1

 

 

Q.1. In human heart, oxygenated and deoxygenated blood never mix up. Give reason.

Q.2. Explain how water is essential for plants.

Q.3. Most physical changes are reversible. Explain with two examples.

Q.4. What is acid rain?

Q.5. Define the following:

(i) Host

(ii) Mycorrhiza

Q.6. What is the difference between assimilation and absorption?

Q.7. What are the different excretory products in land animals and aquatic animals?

Q.8. If we see a red coloured cloth in blue light, it will appear black. Will it appear black if we see it in yellow light?

Q.9. How does an electric iron work?

Q.10. Why should you never use a convex lens to look at the sun?

Q.11. Explain the process of conduction and convection.

Q.12. "Water table varies from place to place". Justify this statement.

Q.13. Write a short note on occupational diseases that affects the workers working in the wool industry.

Q.14. Briefly describe any three wools obtained from animals other than sheep.

Q.15. (a) Give example of two animals in which exchange of gases takes place through moist outer surface.

(b) How can you differentiate between breathing and respiration?

 

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