Fsc Part 2 Online Preparation for Biology Chapter 17 (Coordination and Control)

Online Short Questions For Chapter 3 "12th Class Biology Chapter 17 Short Questions Preparation "

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Biology - 12th Class Biology Chapter 17 Short Questions Preparation

Question # 1

Differentitae between reflex arc and reflex action.

  • Ans 1: Reflex arc The path followed by the nerve impulse during the reflex action is called reflex arc.
  • Ans 2: Reflex Action Involuntary actions are called reflex action.This action is performed without the involvement of brain.
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Prepare Complete Set Wise Questions For Chapter 3 "12th Class Biology Chapter 17 Short Questions Preparation "

12th Class Biology Chapter 17 Short Questions Preparation - Set 1

Question # 1

Differentitae between reflex arc and reflex action.

  • Ans 1: Reflex arc The path followed by the nerve impulse during the reflex action is called reflex arc.
  • Ans 2: Reflex Action Involuntary actions are called reflex action.This action is performed without the involvement of brain.
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12th Class Biology Chapter 17 Short Questions Preparation - Set 2

Question # 1

Give two functions of cytokinin hormone.

  • Ans 1: It inhibits primary root growth and promote opening of stomata.
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12th Class Biology Chapter 17 Short Questions Preparation - Set 3

Question # 1

Give two characteristics of hormones.

  • Ans 1: hormones are porteins in nature.

  • Ans 2: They help in the co-ordination of the organisms by activating the target cells of the body.
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12th Class Biology Chapter 17 Short Questions Preparation - Set 4

Question # 1

Give the functions of androgens.

  • Ans 1: In human males androgens cause the development of secondary male characteristics. In females its excess secretion may cause the development of male characters.
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12th Class Biology Chapter 17 Short Questions Preparation - Set 5

Question # 1

Mention the relative abundance and distribution of receptors in human skin.

  • Ans 1: The relative abundance of various types of receptors differs greatly for example pain receptors are nearly 27 times more abundant than cold receptors.The cold receptors are nearly 10 times more abundant than heat or temperature receptors.
  • Ans 2: The receptors are not distributed evenly over the entire surface of the body.For example touch receptors are much more numerous in the finger than in the skin of the back.
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12th Class Biology Chapter 17 Short Questions Preparation - Set 6

Question # 1

Name hormones released by adrenal gland.

  • Ans 1: It produces adrenaline and nor adrenaline by adrenal medulla.
    Adrenal cortex produces aldosterone and androgenic hormones.

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12th Class Biology Chapter 17 Short Questions Preparation - Set 7

Question # 1

Sketch and label sensory neuron.

  • Ans 1: Differentiate between axons and dendrites.
  • Ans 2: Dendrite It is cytoplasmic fiber of neuron which is smaller in size but many in number and conduct nerve impluse towards cell body.
  • Ans 3: Axon It is cytoplasmic fiber of neuron which is very long in size and one in number and conduct nerve impulse away from cell body.
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12th Class Biology Chapter 17 Short Questions

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