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

Give two examples of short day plants.

  • Ans 1: Tobacco,Strawberry,Soybean are short day plants.
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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

Give two examples of short day plants.

  • Ans 1: Tobacco,Strawberry,Soybean are short day plants.
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12th Class Biology Chapter 18 Short Questions Preparation - Set 2

Question # 1

Define labour pain.

  • Ans 1: At the time of birth, the reduction of progesterone level stimulates pituitary gland to produce oxytocin. This induces labour pain or contraction of the uterus wall.
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12th Class Biology Chapter 18 Short Questions Preparation - Set 3

Question # 1

What is tissue culture? Explain.

  • Ans 1: Growth of plant under aseptic conditions in culture medium is called tissue culture. In this technique tissue cut from the plant could be stimulated by the addition of nutrients, cytokinin, auxin, these cell show continued growth and differentiated in to a new plant.
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12th Class Biology Chapter 18 Short Questions Preparation - Set 4

Question # 1

What is menopause?At which age it starts.

  • Ans 1: The end or complete stop of menstrual cycle is called menopause. It starts at the age of 45 to 50 year
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12th Class Biology Chapter 18 Short Questions Preparation - Set 5

Question # 1

What is role of progestrone in pregnancy?

  • Ans 1: The end or complete stop of menstrual cycle is called menopause. After menopause female can't produce any more ovum or egg & can't give birth to any child.
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12th Class Biology Chapter 18 Short Questions Preparation - Set 6

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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18th Chapter

12th Class Biology Chapter 18 Short Questions

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