TEST PAPER 11 - UNITS 6,7,8 - 50 MARKS

There are 26 questions in all and time limit is 90 minutes.

SECTION - A : CHOOSE APPROPRIATE ALTERNATIVE : [1 mark each, Total marks 7]

1. In insects the air enters the tracheal system through ______.
   
   
   
   1. spiracles
   2. nostrils
   3. lungs
   4. bronchi
      
   
   
2. The function of incisors is ______.
   
   
   
   1. cutting
   2. tearing
   3. grinding
   4. chewing
      
   
   
3. There are ______ types of antigens on erythrocytes.
   
   
   
   1. five
   2. four
   3. three
   4. two
      
   
   
4. A sunflower plant bends towards the sun; it is ______ response.
   
   
   
   1. thigmonastic
   2. seismonastic
   3. thermonastic
   4. photonastic
      
   
   
5. ______ is useful where seeds have long dormancy period and poor germination capacity.
   
   
   
   1. Cutting
   2. Layering
   3. Grafting
   4. Regeneration
      
   
   
6. ______ is an example of retrovirus.
   
   
   
   1. Virus causing AIDS
   2. TMV
   3. Bacteriophage
   4. RIV
      
   
   
7. Eutrophication increases due to increase in ______.
   
   
   
   1. BOD
   2. industrialisation
   3. DOB
   4. soil erosion
      
   
   
   
   

   SECTION - B : ANSWER IN SHORT : [1 mark each, Total marks 7]
   

8. Through what does a frog respire ?
9. What is lymph ?
10. Which plant hormones retard growth ?
11. What is menopause ?
12. What is the difference between prokaryotic and eukaryotic chromosomes ?
13. What is meant by organic evolution ?
14. What is the full form of NEERI ?
    
    

    SECTION - C : ANSWER IN BRIEF : [2 marks each, Total marks 12]
    

15. Describe the effect of water and carbon dioxide on the process of photosynthesis.
16. Write a note on blood platelets.
17. Explain : Photoperiodism  OR   Mention the names of four endocrine glands in humans.
18. Distinguish between asexual and sexual reproduction(two points).
19. Explain : Variation.
20. Mention two effects of land pollution.  OR   Draw a chart showing types of environment.
    
    

    SECTION - D : ANSWER THE FOLLOWING : [3 marks each, Total marks 9]
    

21. Describe exchange of gases in roots and stems with diagram.  OR   Describe digestive system of grass-hopper with diagram.
22. Write a note on tropism.
23. Mention any six laws for environmental protection in India.
    
    

    SECTION - E : ANSWER IN DETAIL : [5 marks each, Total marks 15]
    

24. Describe excretion in eatrhworm.  OR   Describe the structure of nephron with diagram.
25. Describe sexual cycle in human female.
26. Write a note on types of chromosomes with diagram.