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The Organ a Which is Located Inside the Skull of Our Body is Protected by a Bony Shell B. It is Surrounded by Three Layers Membranes C. the Spaces Between These Layers Are Filled with a Liquid D Which Protects Organ a from Mechanical Shocks. Organ a in Combination with Another Organ E Makes up the Central Nervous System. (A) What is Organ A? (B) What Are B, C and D? (C) Name the Organ E. (D) While Walking Barefoot, If We Happen to Step on a Sharp Piece of Stone, We Immediately Lift Our Foot Up. Which of the Two Organs: a Or E, is Directly Involved in this Action? (E) If We Step Out from a Darkened Room into Bright Sunlight, We Close Our Eyes for a Moment. Which of the Two Organs: a Or E, is Directly Involved in this Action? - Science

The organ A which is located inside the skull of our body is protected by a bony shell B. It is surrounded by three layers membranes C. The spaces between these layers are filled with a liquid D which protects organ A from mechanical shocks. Organ A in combination with another organ E makes up the central nervous system.

(a) What is organ A?
(b) What are B, C and D?
(c) Name the organ E.
(d) While walking barefoot, if we happen to step on a sharp piece of stone, we immediately lift our foot up. Which of the two organs: A or E, is directly involved in this action?
(e) If we step out from a darkened room into bright sunlight, we close our eyes for a moment. Which of the two organs: A or E, is directly involved in this action?

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Solution

  1. The organ A is the brain. The brain is located inside the skull of our body at the top of the spinal cord.
  2. (i) B is the cranium. The brain is protected by a bony box in the skull called the cranium.

          (ii) C are meninges. The brain is surrounded by three layers of membranes called the meninges.
          (iii) D is the cerebrospinal fluid. It is present in between the meninges and protects the brain from mechanical shocks.

  1. The organ E is the spinal cord. The brain (organ A) and the spinal cord (organ E) together make central nervous system.
  2. A person walking barefoot lifts his foot at once on stepping on to a sharp piece of stone. The spinal cord (E) is involved in this action. Those reflexes that involve only the spinal cord are called spinal reflexes.
  3. A person closes his eyes at once when he steps out from a darkened room to bright light. The brain (A) is involved in this action. Those reflexes that involve only the brain are known as cerebral reflexes.
  Is there an error in this question or solution?
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APPEARS IN

Lakhmir Singh Class 10 Biology (Science)
Chapter 2 Control and Coordination
Q 113 | Page 122
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