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

Define vernalisation. Give its one importance.

  • Ans 1: Chilling treatment given to seeds before sowing is called vernalisation.
    Its importance is as follows:
  • Ans 2: It ensure that all the members of a species flower at the same time.
  • Ans 3: It also synchronize the reproductive behavior of the plant wit their environment.
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Prepare Complete Set Wise Questions For Chapter 4 "12th Class Biology Chapter 18 Short Questions Preparation "

12th Class Biology Chapter 18 Short Questions Preparation - Set 1

Question # 1

Define vernalisation. Give its one importance.

  • Ans 1: Chilling treatment given to seeds before sowing is called vernalisation.
    Its importance is as follows:
  • Ans 2: It ensure that all the members of a species flower at the same time.
  • Ans 3: It also synchronize the reproductive behavior of the plant wit their environment.
Submit

12th Class Biology Chapter 18 Short Questions Preparation - Set 2

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 Preparation - Set 3

Question # 1

Differentiate identical twins and triplets.

  • Ans 1: Identical twins: If new born organisms are the product of mitosis and they have same genetic makeup, they are called identical twins.
  • Ans 2: Identical Triplets: In some cases, more than one egg are produced by the female and all eggs are independently fertilized two or more zygote. These zygote develops into new offspring, but with different genetic combination. such twins or triplets are called fraternal twins or triplets. They are produced sexually.
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12th Class Biology Chapter 18 Short Questions Preparation - Set 4

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 5

Question # 1

What are phytochromes?

  • Ans 1: Phytochromes are blue light sensitive proteins found in plants. They exist in two form i.e,P660 andP730. They play an important role in photoperiodism.
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12th Class Biology Chapter 18 Short Questions Preparation - Set 6

Question # 1

Differentiate between lactation and gestation.

  • Ans 1: Lactation: Lactation means discharge or production of milk from the mammary gland after child birth.
  • Ans 2: Gestation: Gestation is the total time period of pregnancy is called gestation. In human gestation period is of nine months.
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18th Chapter

12th Class Biology Chapter 18 Short Questions

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