Question

CLASS: X II MID-TERM TEST MARK: 50

DATE: 26.11.2020 SCIENCE TIME: 1.30HRS

I) Choose the correct answer (10 X 1 = 10)

1. Power of a lens is - 4D, then its focal length is __________

a) 4m b) - 40m c) – 0.25m d) – 2.5m

2. The scattered light in Raman scattering contains ______ lines.

a) Stroke’s b) Anti stroke’s c) Rayleigh’s d) All the above

3. Rectified spirit is an aqueous solution which contains about ________ of ethanol.

a) 95.5% b) 75.5% c) 55.5% d) 45.5%

4. True or false

Soaps are manufactured by the saponification of oils and fats.

5. The molecular formula of an open chain organic compound is C3H6. The class of

the compound is ________

a) Alkane b) Alkene c) Alkyne d) Alcohol

6. Estrogen is secreted by

a) Anterior pituitary b) Primary follicle

c) Graffian follicle d) Corpus luteum

7. Syngamy results in the formation _________

a) Zoospores b) Conidia c) Zygote d) Chlamydospores

8. The types of cell division occurs in generative cell of mature pollen grain

a) Mitosis b) Meiosis c) Amitosis d) Both b) and c)

9. The term ethnobotany was coined by

a) Khorana b) J.W. Harsh Berger c) Ronald Ross d) Hugo Devries

10. Mutation theory was proposed by ________

a) Devries b) Birbal Sahani c) Darwin d) Sternberg

II) Write any 5 questions (5 X 2 = 10)

11. How can you determine the age of the fossils?

12. Define triple fusion.

13. Draw the diagram of pollen grain and label the parts.

14. Define esterification.

15. Define functional group.

16. State Snell’ law.

17. List out the advantages of telescope.
III) Write any 4 questions (4 X 4 = 16)

18. List any five properties of Light.

19. Differentiate soaps and detergents.

20. Write the uses of ethanol and ethanoic acid.

21. Give an account of structure of ovum with neat labelled diagram.

22. Differentiate homologous organs and analogous organs.

23. Enumerate the principle of Lamarckism.

IV) Write any 2 questions (2 X 7 = 14)

24. How does fossilization occur in plants?

(OR)

Describe the parts of a typical angiosperm ovule with the neat labelled diagram.

25. How is ethanol manufactured from sugarcane?

(OR)

a) Differentiate eye defects Myopia and Hypermetropia.

b) What are the causes of Myopia?

**********ALL THE BEST, STUDENTS!!!**********​

Answer 1

Explanation:

1. 25cm

2.In raman scattering stokes lines are the high wavelength & antistokes have least wavelength in the scattered light.

3.95%

4.True

5.alkene

6.primary follicle

7.zygote

8.Answer: Meiotic cell division is the process that occurs during formation of pollen grains in flowering plants. As we know meiosis is the cell division process that produces gamates in both animal and plant system.

9.