16 June 2012

CBSE TEST PAPER CLASS - IX Science (The Fundamental Unit of Life)

 CBSE TEST PAPER CLASS - IX Science (The Fundamental Unit of Life)

I. SHORT ANSWER Questions1. (a) What is DNA? Where is it found?

(b) Name the functional segment of DNA.

2. List two similarities between mitochondria and plastids.

3. Name the organelle that is referred to as the ‘powerhouse of the cell’. Why is it called so?

4. Mention any two functions of the endoplasmic reticulum.

5. Give the functions of the following organelles in a cell. (i) Chloroplast (ii) Nucleus

6. Which cell organelle is called ‘suicide bag of a cell’? Why?

7. Write the names of two cell organelles that have their own DNA and ribosomes.

8. State any two reasons for plant cells to have large central vacuole.

9. (a) What is plasma membrane made up of ? (b) Name the process by which food and other substances enter through the plasma membrane.

10. What is endocytosis? Name an organism that feeds by this method.

11. Give technical term for a medium which has exactly the same concentration as the cell? Why

does the size of the cell remain the same when placed in such a solution

12. (a) What would happen to the life of a cell if there was no Golgi apparatus? (b) Which cell organelle detoxifies poisons and drugs in liver of vertebrates?]

13. State cell theory. Name the scientist who presented it.]

14. What is plasmolysis? Give its one example.

15. What will happen to a plant cell if it is kept in a (i) hypotonic solution (ii) hypertonic solution.

16. Write two differences between plasma membrane and cell wall.

17. What are endocytosis? Give one example.

18. Name the scientist who first described Golgi apparatus. What is cisterns?

19. Name the two organelles in a plant cell that contain their own genetic material and ribosomes.

20. Why are lysosomes also known as “scavangers of the cells”?

21. How can mitochondria make their own protein?

22. Name the two nucleic acids present in the cell. (a)root of plants (b) leaves of plants

23. Why do plant cells possess large sized vacuole?

24. A person takes concentrated solution of salt, after sometime, he starts vomiting. What is the phenomenon responsible for such a situation?

25. How do substances like carbon dioxide and water move in and out of the cell?

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