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 "

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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

Discuss diakinesis in meiosis.

  • Ans 1: During this phase the condensation of chromosomes reaches to its maximum.At the same time separation of homologous chromosomes is completed,but still they are united at one point,more oftenly at ends.Nucleoli disappear.
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12th Class Biology Chapter 21 Short Questions Preparation - Set 3

Question # 1

Give main feature of metaphase of Meiosis-1.

  • Ans 1: Nuclear membrane disorganizes.Spindle fibers originate and attached with kinetochore of homologous chromosomes from each pole and arrange bivalent at equator.
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12th Class Biology Chapter 21 Short Questions Preparation - Set 4

Question # 1

Define non-disjunction of chromosomes. Or Define chromosomal non-disjunction.

  • Ans 1: It is chromosomal non disjunction,during which spindle fibers fail to attach with chromosomes and resulting unequal distribution of chromosomes occur.
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12th Class Biology Chapter 21 Short Questions

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