Maharaja agarsain public school

Biology,Assignment

Class-XII

1. Which period is called “Age of Reptiles”. [1]

2. Name the species of human beings which is most closely related to modern man. [1]

3. What is “Founder’s effect”? [1]

4. A chimpanzee can hold objects by its hand & an elephant by trunk. Are these organs Analogous or homologous? [2]

5. Differentiate between convergent & divergent evolution? [2]

6 Bring out differences between De Vrie’s mutations and Darwinian Variations? [2]

7. State in what ways Stanley miller simulated the condition of :- i) Primitive atmosphere on earth. ii) Energy source at the time of origin of life . iii) Formation of organic molecule of life. [3]

8. What is Biogeography? How Darwin’s finches provide biogeographical evidence in favour of evolution. [3]

9. How did louis pasteur successfully demolish the popular theory of spontaneous generation? [3]

1 0. Study the figures given below & answer the following question

. i) Under the influence of which type of natural selection would graph (a) become like graph (b). ii ) What could be the likely reason of new variations arising in a population. iii) Who suggested natural selection as mechanism of evolution? [3]

11.When and where does Homo habalis first seen on earth ?(2)

12.What are the factors responsible for evolution as per hardy Weinberg principle?

13.What is adaptive radition ?How is it related to convergent evolution?

14.Explain industrial melanism?

15.What provided energy for a biotic synthesis on primitive earth? [1]

16. Who showed that life comes from pre-existing life? [1]

17. What is meant by Gene pool? [1]

18. If you discovered a fossil bird with scales on the body & teeth in the beak.

19. What is speciation? List any two events that lead to speciation? [2]

20. Trace the important events or stages of human development? [3]