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

What are neurotransmitters?Give it example.

  • Ans 1: Neurotransmitters are the chemicals which are secreted at neuron endings,which transfer nerve impluse from on neuron to another neuron e.g Acetylcholine,adrenaline,dopamine,serotonin.
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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

What are neurotransmitters?Give it example.

  • Ans 1: Neurotransmitters are the chemicals which are secreted at neuron endings,which transfer nerve impluse from on neuron to another neuron e.g Acetylcholine,adrenaline,dopamine,serotonin.
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12th Class Biology Chapter 17 Short Questions Preparation - Set 2

Question # 1

What is cretinism?

  • Ans 1: If congenitally thyroxin production is low,it may cause cretinism,where the individual fails to develop normally.These are small,have coarse scanty hairs,thick yellowish scaly skin and mentally retarded.
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12th Class Biology Chapter 17 Short Questions Preparation - Set 3

Question # 1

What are the commercial applications of cytokinins?

  • Ans 1: It is used to delay age of fresh leaf crops and keep flowers fresh.It can also be used to break dormancy of seeds of some plants.
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12th Class Biology Chapter 17 Short Questions Preparation - Set 4

Question # 1

What is cretinism?

  • Ans 1: If congenitally thyroxin production is low,it may cause cretinism,where the individual fails to develop normally.These are small,have coarse scanty hairs,thick yellowish scaly skin and mentally retarded.
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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

What is cerebrospinal fluid?Give its function.

  • Ans 1: Beneath the cranium,the brain and spinal cord are protected by triple layer of meninges.Between the layers of meninges the cerebrospinal fluid (CSF),similar in composition to blood plasma.
  • Ans 2: Its function is to bath the neurous of brain and spinal cord and it cushions against bumps and jolts.
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12th Class Biology Chapter 17 Short Questions Preparation - Set 7

Question # 1

Compare photoreceptors with chemoreceports.

  • Ans 1: Chemoreceptors These are sensitive for chemical changes.These are for smell,taste and for blood carbon dioxide and oxygen,glucose,amino acids and fatty acids(receptors in hypothalamus)
  • Ans 2: Photoreceptors Electromagnetic receptors or photoreceptors respond to stimuli of light for example in eyes,rods and cones
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12th Class Biology Chapter 17 Short Questions

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