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 the role of P730 phytochrome in flowering?

  • Ans 1: P730 induce flowering in long day plant while inhibit flowering in 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

What is the role of P730 phytochrome in flowering?

  • Ans 1: P730 induce flowering in long day plant while inhibit flowering in short day plants.
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12th Class Biology Chapter 18 Short Questions Preparation - Set 2

Question # 1

Define parthenocarpy with example.

  • Ans 1: Formation of fruit without fertilization is called parthenocarpy. For example seedless grapes and banana.
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12th Class Biology Chapter 18 Short Questions Preparation - Set 3

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 4

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 5

Question # 1

Define placenta. Give its function.

  • Ans 1: Placenta acts as bridge between mother body and foetus. Once the placenta established it start secreting progesterone hormone which maintain pregnancy. Placenta also play role in transport of nutrients and oxygen to foetus and bring back waste from the foetus to mother body.
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12th Class Biology Chapter 18 Short Questions Preparation - Set 6

Question # 1

Differentiate between oviparous and viviparous.

  • Ans 1: Oviparous: Oviparous are the eggs laying animals like birds.
  • Ans 2: viviparous: Viviparous are those animals which give birth to their young ones like mammals
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18th Chapter

12th Class Biology Chapter 18 Short Questions

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