1.Why do asexually reproducing organisms shows very little variation and what is cause of this variation?2.Do the survival of variants have equal chances? If not explain the factors on which survival depends.3.How the creation of variation in certain species promotes survival?4.Why did Mendel select pea plant for his experiment?5.What are the seven contrasting character observed by Mendel in pea plant?6.With schematic figure show inheritance of any trait over two generations?7.With schematic figure show independent inheritance o0f two separate traits.8.What experiment confirms that the F2 generation did in fact have a 1:2:1 ratio. Show this giving an example.9.A man with blood group A marries a woman with blood group O and their daughter has blood group O. With schematic figure explain how this could be possible?10.Briefly describe sex determination in human beings.11.How did Mendel’s experiment show that traits might be dominant or recessive?12.Give an example in which adaptation in the population fit an organism better in its environment.13.How does genetic drift change the frequency of same gene? Explain this giving an example.14.If tails of rats are cut upto many generation’s tailless rats are not found. Why?15.What is the limitation of Darwin’s natural selection?16.Name the scientist who proved that life originated from a-biogenetic molecule?17.What are the factors that led to the rise of new species?18.What is microevolution? What are its limitations?19.Define speciation? How do evolution of species occur due to speciation?20.Distinguish between homologous and analogous organs with examples of animals and plants.21.What are fossils? How do fossils provide evidences of evolution of species?22.Give one example that explains that a change that is useful for one property can become useful later for a quite different function.23.What is the basic event in evolution process?24.Give the scientific name of man.25.Where did first thinking man appear on the earth surface?How is equal genetic contribution of male and female parent ensured in the progeny?
NCERT / CBSE Literature Reader for English Course (Communicative) Important Exercise Questions Q.3: (a) Why is Ramanujam worried about getting his daughter married? Give four reasons. (b) How does the postman console and guide Ramanujam and his family during each of the instances you have listed in 3 (a)? Ans 3(a): Ramanujam is worried as he could not find a suitable match to marry his daughter off which was getting delayed because of different reasons. The four causes of his worriedness are - (i) Sometimes horoscopes did not match, (ii) Sometimes the girl’s appearance were not approved, (iii) At times there were problems of too much dowry and other financial matters, (iv) The season was closing with only three more auspicious dates left, whereas, he was not able to finalise any alliance by that time. Ans 3(b): First instance - When Ramanujam said that horoscopes did not agree Thanappa consoled and guided him by saying that he should not utter inauspicious words and when the God wills ...
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