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You may gather information out of curiosity about geological events occurred in the past.

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A student performed following two activities in school laboratory: Activity 1: Addition of zinc dust into copper sulphate solution taken in a test tube. Activity 2: Addition of an iron nail into copper sulphate solution taken in a test tube. He noted down his observations and concluded that chemical reaction occurs in both the cases based on the observed colour change of the resulting solution. Based on these activities, what can you conclude about the reactivity of elements zinc and iron as compared to that of copper?

CHETANA PUBLICATION-ORIGIN AND EVOLUTION OF LIFE -Exercise
  1. You may gather information out of curiosity about geological events oc...

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  2. Who proposed that the first form of life could have come from pre- exi...

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  3. The sequence of origin of life may be.

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  4. In Hardy-Weinberg equation, the frequency of homozygous recessive indi...

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  5. Select the analogous organs.

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  6. Archaeopteryx is known as missing link because it is a fossil and shar...

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  7. Identify the wrong statement regarding evolution.

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  8. Gene frequency in a population remain constant due to-

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  9. Which of the following characteristic is not shown by the ape?

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  10. can be considered as connecting link between ape and man.

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  11. The Cranial capacity of Nanderthal man was

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  12. About 15 billion years ago, single titanic explosion occurred which is...

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  13. ....................... years ago, earth was formed.

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  14. Protobiogenesis refers as .....................

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  15. According to the ........................, all the living beings on th...

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  16. The first chemicals formed on the earth were

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  17. The primitive sea containing molecules of organic substance free of .....

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  18. What is considered as a landmark in the origin of life ?

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  19. The first form of life on earth consisting of nucleic acid along with ...

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  20. Name the island where Darwin visited while formulating the theory of N...

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  21. The prebiotic atmosphere of the earth was............

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