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 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 1

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.
Submit

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

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 3

Question # 1

What is diploid parthenogenesis?

  • Ans 1: In diploid partenogenesis a diploid egg is formed due to non disjunction of chromosomes, they retain their diploid number of chromosomes; diploid egg then develops in to young female.
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12th Class Biology Chapter 18 Short Questions Preparation - Set 4

Question # 1

Name two sexually transmitted disease and their control.

  • Ans 1: Genital herpes and AIDS. These sexually transmitted diseases can be controlled by avoiding sexual contact with affected person and adopting the hygienic conditions and also by taking medical treatment.
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12th Class Biology Chapter 18 Short Questions Preparation - Set 5

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 6

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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18th Chapter

12th Class Biology Chapter 18 Short Questions

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