Second Year Biology Chapter 18 Short Questions Online Preparation (Reproduction)

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Biology - 12th Class Biology Chapter 18 Short Questions Preparation

Question # 1

Differentiate between short day plant and long day plants with examples.

  • Ans 1: Short day plants: Short day plants flower when the days are short and nights are long e.g, tobacco,soybean.
  • Ans 2: Long day plants:Long day plant produce flowers when days are long and nights are short e.g, cabbage,spring wheat.
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12th Class Biology Chapter 18 Short Questions Preparation - Set 1

Question # 1

Differentiate between short day plant and long day plants with examples.

  • Ans 1: Short day plants: Short day plants flower when the days are short and nights are long e.g, tobacco,soybean.
  • Ans 2: Long day plants:Long day plant produce flowers when days are long and nights are short e.g, cabbage,spring wheat.
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12th Class Biology Chapter 18 Short Questions Preparation - Set 2

Question # 1

Apomixes is a form of parthenogenesis.Discuss

  • Ans 1: In apomixes a diploid cell either from the nucellus or megaspore develops into a functional embryo in the absence of a male gamete. The rest of the ovule develops into seed and and ovary into fruit.
  • Ans 2: Parthenogenesis: Development of an egg without fertilization
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12th Class Biology Chapter 18 Short Questions Preparation - Set 3

Question # 1

What are functions of sertoli cells?

  • Ans 1: Fluid secreted by sertoli cells provides liquid medium, protection and nourishment to sperms while they are in tubules.
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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

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 6

Question # 1

Why seed plants are predominantly present all around as?

  • Ans 1: Seed plants are very common around us become these plants are have many adaptations to survive on land like protected seeds,flower and fruit formation.Seed dispersal plays an important role in distribution of flowering plants.
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12th Class Biology Chapter 18 Short Questions

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