Fsc part 2 online preparation for biology chapter 21 (Cell Cycle)

Online Short Questions For Chapter 7 "12th Class Biology Chapter 21 Short Questions Preparation "

Try The Short Questions For 12th Class Biology Chapter 21 Short Questions Preparation

  • Total Questions10

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Biology - 12th Class Biology Chapter 21 Short Questions Preparation

Question # 1

How does cell death help in development of multicellular organisms?

  • Ans 1: Programmed cell death help in proper control of multicellular organisms development,which may lead to deletion of entire structure (e.g.,the tail of the developing human embryo) or a part of structure (e.g.,tissues between developing digits).Cell death even controls number of neurons because most of the neurons in human body die during development.
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Prepare Complete Set Wise Questions For Chapter 7 "12th Class Biology Chapter 21 Short Questions Preparation "

12th Class Biology Chapter 21 Short Questions Preparation - Set 1

Question # 1

How does cell death help in development of multicellular organisms?

  • Ans 1: Programmed cell death help in proper control of multicellular organisms development,which may lead to deletion of entire structure (e.g.,the tail of the developing human embryo) or a part of structure (e.g.,tissues between developing digits).Cell death even controls number of neurons because most of the neurons in human body die during development.
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12th Class Biology Chapter 21 Short Questions Preparation - Set 2

Question # 1

Give causes and symptoms of Down's syndrome. Or Write symptoms of Down's syndrome.

  • Ans 1: The cause of Down's syndrome is the missing of 21stchromosomes due to non disjunction. The affected individuals have a flat,broad face,squint eyes with folds in the inner corner and protruding tongue,mental retardation and defective development of central nervous system.
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12th Class Biology Chapter 21 Short Questions Preparation - Set 3

Question # 1

Give two disadvantages of cloning..

  • Ans 1: Disadvantages of cloning are.
  • Ans 2: 1) All members of cloning are identical to each other and no genetic variability is produced.
    2) Member of clone does not show resistance to diseases and has less survival ability.
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12th Class Biology Chapter 21 Short Questions Preparation - Set 4

Question # 1

How chromatin differs from chromosomes.

  • Ans 1: Chromatin is thread like network,it is formed when chromosomes becomes uncoiled.
    Chromosomes are composed of DNA and protenis. When chromatin is highly coiled it changes in to chromosomes.
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21th Chapter

12th Class Biology Chapter 21 Short Questions

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