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Using various resources such as your sch...

Using various resources such as your school liberary or the internet and discussions with your teacher, trace the evolutionary stages of any one animal, say horse.

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Read the following paragraph carefully and answer the following: Tie a stone to one end of a string. Take the other end in your hand and rotate the string so that the stone moves along a circle. As long as we are holding the string, we are pulling the stone towards us i.e. towards the centre of the circle and are appliying a force towards it. The force stops acting on it if we release the string. In this case, the stone will fly off along a straight line which is the tangent to the circle at the position of the stone when the string is released, because that the directionn of its velocity at that instant of time. You may recall a similar activity in which a 5 rupee coin kept on a rotating circular disc flies off the disc along the tangent to the disc. Thus, a force acts on any object moving along a circle and it is directed towards the centre of the circle. This is called the Centripetal force. The impressed force on the same is in which direction?

Read the following paragraph carefully and answer the following: Tie a stone to one end of a string. Take the other end in your hand and rotate the string so that the stone moves along a circle. As long as we are holding the string, we are pulling the stone towards us i.e. towards the centre of the circle and are appliying a force towards it. The force stops acting on it if we release the string. In this case, the stone will fly off along a straight line which is the tangent to the circle at the position of the stone when the string is released, because that the directionn of its velocity at that instant of time. You may recall a similar activity in which a 5 rupee coin kept on a rotating circular disc flies off the disc along the tangent to the disc. Thus, a force acts on any object moving along a circle and it is directed towards the centre of the circle. This is called the Centripetal force. What happens if the string is released?

Read the following paragraph carefully and answer the following: Tie a stone to one end of a string. Take the other end in your hand and rotate the string so that the stone moves along a circle. As long as we are holding the string, we are pulling the stone towards us i.e. towards the centre of the circle and are appliying a force towards it. The force stops acting on it if we release the string. In this case, the stone will fly off along a straight line which is the tangent to the circle at the position of the stone when the string is released, because that the directionn of its velocity at that instant of time. You may recall a similar activity in which a 5 rupee coin kept on a rotating circular disc flies off the disc along the tangent to the disc. Thus, a force acts on any object moving along a circle and it is directed towards the centre of the circle. This is called the Centripetal force. What is centripetal force?

You have been deputed by your school Principal to train local village in the use of biogas plant. With the help of a labelled sketch explain the various parts of the biogas plant.

NEW JOYTHI PUBLICATION-EVOLUTION -Previous Year Competitive Exam Questions(MCQs)
  1. Using various resources such as your school liberary or the internet a...

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  2. What are the constituents of Miller's experiment?

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  3. According to Oparin's theory which of the following gases were not pre...

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  4. Who said that organisms develop from pre-existing organisms?

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  5. Who performed an experiment to prove that organic compounds were the b...

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  6. Which of the following scientists said that life orginated from simple...

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  7. The simple organic compounds that may have first evolved in the direct...

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  8. Life cannot originate from inorganic material at present because

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  9. The presence of salts (NaCl and other) in the animal body fluids gives...

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  10. Chemical theory of origin of life was given by

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  11. Which of the following is vestigial organ in human?

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  12. Evolutionary convergence is characterised by

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  13. The mutations are mainly responsible for

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  14. Speciation occurs when

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  15. Survival of the fittest and stuggle for existence is related to

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  16. Homologous pairs of organs are

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  17. Lamarckism fails for the explaination

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  18. Reproductive isolation means

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  19. The statement "Nothing in biology makes sense except in the light of e...

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  20. Archaeopteryx is the connecting link between

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  21. The order in which horse evolution has occurred

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