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 the role of P730 phytochrome in flowering?

  • Ans 1: P730 induce flowering in long day plant while inhibit flowering in short day plants.
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12th Class Biology Chapter 18 Short Questions Preparation - Set 1

Question # 1

What is the role of P730 phytochrome in flowering?

  • Ans 1: P730 induce flowering in long day plant while inhibit flowering in short day plants.
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12th Class Biology Chapter 18 Short Questions Preparation - Set 2

Question # 1

Define seed dormancy. Write its signifance. Give Its importance.

  • Ans 1: it is special condition of rest, which enables an embryo to survive the unfavorable environmental conditions.
  • Ans 2: Its importance is that during this period of rest the embryo ceases its growth.
  • Ans 3: This is of great survival importance to the plant in that it prevents the dormant seeds from germinating in response to condition such as long spell of warmth in winter.
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12th Class Biology Chapter 18 Short Questions Preparation - Set 3

Question # 1

Differentiate between tissue culture and cloning.

  • Ans 1: Tissue Culture: It is the growth of a tissue or plant in an artificial growth culture medium under aseptic conditions.
  • Ans 2: Cloning: It is asexual reproduction in which genetically identical organisms are produced from a single species.
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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

Apomixes is a form of parthenogenesis.Discuss

  • Ans 1: In apomixes a diploid cell either from the nucellus or megaspore develops into a functional embryo in the absence of a male gamete. The rest of the ovule develops into seed and and ovary into fruit.
  • Ans 2: Parthenogenesis: Development of an egg without fertilization
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12th Class Biology Chapter 18 Short Questions Preparation - Set 6

Question # 1

Give importance of photoperiodism in plants.

  • Ans 1: Photoperiodism plays an important role in flowering of plants in long and short day plants.
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12th Class Biology Chapter 18 Short Questions

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