TEST PAPER 31 : CHAPTER 17 : HEREDITY & EVOLUTION : 25 MARKS

There are 15 questions in all and time limit is 45 minutes.

SECTION - A : CHOOSE APPROPRIATE ALTERNATIVE : [1 mark each, Total marks 4]

1. Which of the following is not a nitrogenous base ?
   
   
   
   1. Adenine
   2. Guanine
   3. Cytosine
   4. Deoxyribose sugar
      
   
   
2. ______ gave Germplasm theory.
   
   
   
   1. Lamarck
   2. Weismann
   3. Darwin
   4. Hugo De Vries
      
   
   
3. Fossils of _____ provide evidence of evolution as the connecting link between birds and reptiles.
   
   
   
   1. Dinosaurs
   2. Lizard
   3. Archeopteryx
   4. Ostrich
      
   
   
4. Which principle was given by Darwin ?
   
   
   
   1. Inheritance of acquired characters
   2. Germplasm theory
   3. Mutation theory
   4. Theory of natural selection
      
   
   

   SECTION - B : ANSWER IN SHORT : [1 mark each, Total marks 4]
   

5. Give biological meaning of variation.
6. What are homologous chromosomes ?
7. What is the biological name of fruit fly ?
8. What is a retrovirus ?
   
   

   SECTION - C : ANSWER IN BRIEF : [2 marks each, Total marks 8]
   

9. Explain : Heredity.
10. Explain : Mutation.
11. Describe the role of environment in sex determination.
12. Write in brief about components of nucleotides.
    
    

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

13. Mention types of chromosome and describe any two.
14. Mention different evidences to support evolution and describe comparative embryology.
15. Describe the Watson-Crick model for the structure of DNA(diagram not essential).