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 after birth? Or What is meant by after birth?

  • Ans 1: Within 10 to 45 minutes after birth uterus contracts and separate the placenta from the wall of uterus and placenta than pass out through vagina. This is called after birth.
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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

What is after birth? Or What is meant by after birth?

  • Ans 1: Within 10 to 45 minutes after birth uterus contracts and separate the placenta from the wall of uterus and placenta than pass out through vagina. This is called after birth.
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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

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 4

Question # 1

What is oestrous cycle?

  • Ans 1: Oestrous cycle is a reproductive cycle found in all female mammals except human female. In this cycle, the estrogen production prepares the uterus for conception partly and also follicle develops ova.At this stage female needs a physical stimulus of mating for ovulation. She exhibits a desire for mating or is said to be on heat.
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12th Class Biology Chapter 18 Short Questions Preparation - Set 5

Question # 1

Differentiate the internal and external fertilization.

  • Ans 1: External Fertilization:Fertilization which occurs outside the body is know as external fertilization.
    It occurs aquatic environment where male gametes can swin towards females gametes in water medium.
  • Ans 2: Internal Fertilization: Fertilization which occurs inside the body of organisms is known as internal fertilization.
    Sperms are lodged in the female body where fertilization occurs.
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12th Class Biology Chapter 18 Short Questions Preparation - Set 6

Question # 1

What is difference between oogenesis and spermetogensis in humans?

  • Ans 1: Oogenesis: In oogenesis, primary oocytes divide meiotically in to secondary oocytes and first polar body. Second meiotic division in the oocytes proceeds as far as metaphase but is not complete until the oocyte is fertilized by the sperm.
  • Ans 2: Spermatogenesis: during spermatogenesis primary spermatocytes under go meiotic division to form four secondary spermatocytes and spermatids which then differentiated into four mature sperms.
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18th Chapter

12th Class Biology Chapter 18 Short Questions

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