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a) Explain Darwinian theory of evolution...

a) Explain Darwinian theory of evolution with the help of one suitable example. State the two key concepts of the theory.
b) Mention any three characteristics of Neanderthal man that lived in near east and central Asia.

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### Step-by-Step Solution **Part a: Explanation of Darwinian Theory of Evolution** 1. **Introduction to Evolution**: - Evolution is a continuous process that leads to gradual changes in life forms over long periods of time. 2. **Variations in Populations**: ...
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The two key concepts of Darwinian theory of evolution are

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With the help of any two suitable examples explain the effect of anthropogenic actions on organic evolution

A. The conditions primitive on earth (before the origin of life) were : low temperature, volcanic storms, reducing atmosphere containing Ch_(4),NH_(3) , etc. B. Cheetah and humans share similarities in the pattern of bones of forelimbs. C. In a collection of moths made in the 1850s i.e., before industrialization set in, it was observed that there were more dark-winged moths on trees than white-winged moths. D. Branching descent and natural selection are the two key concepts of Darwinian theory of evolution. E. The Neanderthal man with a brain size of 1400 cc lived in east and central Asia 25,000-10,000 years age. Which set of given statements are correct ?

With the help of any two suitable examples explain the effect of anthropogenic actions on organic evolution.

(a) Explain feed back mechanism for regulation of hormonal secretion with the help of one example . (b) State two different types of movement in plant. Mention two points of difference between them.

(a) Explain the observations and the conclusion Darwin by during his visit to Galapagos Islands. (b) Write the two key concepts of Darwin's theory of natural selection.

(a) Explain adaptive radiation with the help of a suitable example. (b) City an example where more than one adaptive radiations have occurred in an isolated geographical area. Name the type evolution your example depicts and state why it is so named.

XII BOARD PREVIOUS YEAR PAPER ENGLISH-XII BOARDS-Section -D
  1. a) Coconut palm is monoecious, while date palm is dioecious. Why are t...

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  2. a) Explain the process of DNA replication with the help of a schematic...

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  3. a) Explain Darwinian theory of evolution with the help of one suitable...

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  4. a) Name the technology that has helped the scientists to propogate on ...

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  5. a) Cancer is one of the most dreaded diseases of humans. Explain 'Cont...

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  6. Mention how does DNA polymorphism arise in a population.

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  7. Write the name of the organism that is referred to as the "Terror of B...

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  8. a) Draw a labelled diagmmatic view of human male reproductive system. ...

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  9. a) Explain the phenomenon of double fertilization. b) Describe the p...

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  10. A national newspaper reported that a 50 metre high 'Sanitary landfill...

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  11. (a) Draw a diagram of the adult human female reproductive system and l...

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  12. (a) Draw a diagrammmatic sketch of a transverse section of an anther ...

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  13. (a) Why does DNA replication occur in small replication forks and not...

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  14. Draw the pyramids of biomass in sea and in a forest. Explain giving re...

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  15. Describe the roles of heat , primers and the bacterium Thermus aquatic...

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  16. Explain the steps involved in the production of genetically engineered...

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  17. (a) " Oraganisms may be conformers or regulators . " Explain this sta...

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  18. Describe the onter - relationship between productivity , gross primary...

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  19. A national newspaper reported that a 50 metre high 'Sanitary landfill...

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  20. (a) Draw a diagram of the adult human female reproductive system and l...

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