GS Biology Questions and Answers

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Q251
In human, increased heat production is achieved most rapidly by increase the activity of the
  • A sweat gland
  • B Liver
  • C Skeletal muscle
  • D Brain
Answer: Option C
Explanation: Skeletal muscles generate significant heat during activity.
Q252
Smooth muscle fibers are
  • A spindle-shaped, unbranched, non striated, multinucleate and involuntary
  • B spindle-shaped, unbranched, unstriated, uninucleate and involuntary
  • C Cylindrical, striated, unbranched, multinucleate and voluntary
  • D Cylindrical, unbranched, non-striated, multinucleate and involuntary
Answer: Option B
Explanation: Smooth muscles are uninucleate, spindle-shaped, and involuntary.
Q253
Muscles, which are immune to fatigue, are
  • A Unstriped muscles
  • B Cardiac muscles
  • C Jaw muscles
  • D Skeleton muscles
Answer: Option B
Explanation: Cardiac muscles continuously contract without fatigue.
Q254
Schwann cells and nodes of Ranvier are found in
  • A Neurons
  • B Chondroblasts
  • C Osteoblasts
  • D Gland cells
Answer: Option A
Explanation: Schwann cells and nodes of Ranvier are part of peripheral nerve fibers.
Q255
Afferent nerve fiber carries impulses from
  • A Effectors to central nervous system
  • B Receptor to central nervous system
  • C Central nervous system to muscle
  • D Central nervous system to receptors
Answer: Option B
Explanation: Afferent fibers transmit sensory information from receptors to CNS.
Q256
The strongest muscle in the body is present in
  • A Arm
  • B Jaw
  • C Thigh
  • D Neck
Answer: Option B
Explanation: The jaw muscle (masseter) is considered the strongest by force exerted.
Q257
Cardiac muscle is made of branched fibers that are
  • A Nonstriated and under voluntary control
  • B Striated and not under voluntary control
  • C Nonstriated and not under voluntary control
  • D Striated and under voluntary control
Answer: Option B
Explanation: Cardiac muscle fibers are striated but involuntary.
Q258
Which of the following tissues in mammals show the least capacity for regeneration?
  • A Endothelium of blood vessels
  • B Skeletal tissue of long bones
  • C Nervous tissue of brain
  • D Epithelial tissue
Answer: Option C
Explanation: Nervous tissue in the brain has very limited regenerative ability.
Q259
Nerve impulses are conducted towards the cell body by
  • A Axons
  • B Ganglia
  • C Dendrites
  • D Neurons
Answer: Option C
Explanation: Dendrites receive impulses and conduct them to the cell body.
Q260
The study of fish culture is called
  • A Ophiology
  • B Ichthyology
  • C Herpetology
  • D Pisciculture
Answer: Option D
Explanation: Pisciculture studies the breeding and rearing of fish.

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