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 gonorrhea and AIDS.

  • Ans 1: Gonorrhea is caused by gram positive bacteria called Neisseria gonorrhoeae,mainly affecting the mucous membrane of urinogenital tract. New born infants may acquire serious eye infection if they pass through infected birth canal. It is highly contagious through sexual contact.
  • Ans 2: AIDS:It is caused by AIDS virus (acquired immune deficiency virus) mainly destroy the WBCs (Iymphocytes) so immune system becomes weak. It is also transmitted from infected person through sexual contact.
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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 gonorrhea and AIDS.

  • Ans 1: Gonorrhea is caused by gram positive bacteria called Neisseria gonorrhoeae,mainly affecting the mucous membrane of urinogenital tract. New born infants may acquire serious eye infection if they pass through infected birth canal. It is highly contagious through sexual contact.
  • Ans 2: AIDS:It is caused by AIDS virus (acquired immune deficiency virus) mainly destroy the WBCs (Iymphocytes) so immune system becomes weak. It is also transmitted from infected person through sexual contact.
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12th Class Biology Chapter 18 Short Questions Preparation - Set 2

Question # 1

What is menopause? Which factors affect reproductive cycle in female?

  • Ans 1: The end or complete stop of the menstrual cycle is called menopause,after which the female stops producing the ova. Malnourishment and emotional stresses effect the female reproductive cycle which may be disturbed. The cycle is not completed in its normal 28 days.
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12th Class Biology Chapter 18 Short Questions Preparation - Set 3

Question # 1

Name the hormones secreted by placenta.

  • Ans 1: Placental lactogen and progestron is secreted by the placenta.
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12th Class Biology Chapter 18 Short Questions Preparation - Set 4

Question # 1

Define phytochromes and give its types.

  • Ans 1: Phytochromes are blue light sensitive proteins which receives the stimulus for flowering. They are of two type i.e, P660or red phytochrome and P730 or far red phytochrome.
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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

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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18th Chapter

12th Class Biology Chapter 18 Short Questions

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