Second Year Biology Chapter 18 Short Questions Online Preparation (Reproduction)

Online Short Questions For Chapter 4 "12th Class Biology Chapter 18 Short Questions Preparation "

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Biology - 12th Class Biology Chapter 18 Short Questions Preparation

Question # 1

What is vernalization?

  • Ans 1: Biennials and perennials plants are stimulated to flower by exposure to low temperature. This is called vernalization. Duration of low temperature (chilling) treatment required varies from four days to three months.Temperature around 4oC is found to be very effective.
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12th Class Biology Chapter 18 Short Questions Preparation - Set 1

Question # 1

What is vernalization?

  • Ans 1: Biennials and perennials plants are stimulated to flower by exposure to low temperature. This is called vernalization. Duration of low temperature (chilling) treatment required varies from four days to three months.Temperature around 4oC is found to be very effective.
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12th Class Biology Chapter 18 Short Questions Preparation - Set 2

Question # 1

Define photoperiodism.

  • Ans 1: Photo mean light; periodism for duration. Response of plants to the duration of light is called photoperiodism.
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12th Class Biology Chapter 18 Short Questions Preparation - Set 3

Question # 1

Give two disadvantages of cloning.

  • Ans 1: The entire organism produced by cloning are identical to each other and no genetic variability is produced.
  • Ans 2: All the organism will not show any resistant to disease if it outbreaks and all the generation will be died.
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12th Class Biology Chapter 18 Short Questions Preparation - Set 4

Question # 1

What is diplohaplontic life cycle? Give its types.

  • Ans 1: In sexual reproduction,plants have diplohaplontic life cycle with alternating diploid sporophyte and haploid gametophyte generations. its type are isomorphic generations and heteromorphic generations.
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12th Class Biology Chapter 18 Short Questions Preparation - Set 5

Question # 1

Name various parts of male reproductive system in male.

  • Ans 1: Tastes, penis, Vas defference,epididymus
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12th Class Biology Chapter 18 Short Questions Preparation - Set 6

Question # 1

Name the hormones that stimulate mammary glands for lactation.

  • Ans 1: Leutotropic hormone (LTH) and placental lactogen both stimulate mammary glands to produce milk.
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12th Class Biology Chapter 18 Short Questions

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