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Neural Control and Coordination Test - 11

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Neural Control and Coordination Test - 11
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  • Question 1
    1 / -0
    Which one of these processes are found in animal only?
    Solution
    • The nervous system is found in the kingdom Animalia. 
    • Except for echinoderms and few worms, the nervous system is found in almost all animals consisting of a brain, a spinal cord, and some nerves. 
    • The nervous system is not found in plants and other organisms like microbes, etc.
    • Hormones are also secreted by plants known as phytohormones.
    • Respiration and diffusion take place in all living cells.

    So, option A is the correct option.
  • Question 2
    1 / -0
    Match the entries in column I with those in column II and choose the correct combination from the option given
    Column IColumn II
    ADiencephalon1Cerebellum
    BTelencephalon2Medulla
    CMyelencephalon3Amygdala
    DMetencephalon4Thalamus
    Solution
    • The diencephalon is a division of the forebrain, situated between the telencephalon and the midbrain. Thalamus is a part of the diencephalon.
    • The amygdala is a collection of cells near the base of the brain. It is the center for emotional memories. It's a part of the Telencephalon.
    • The Myelencephalon or medulla is the posterior portion of the brain stem.
    The metencephalon is the part of the hindbrain which includes the Cerebellum, Pons, etc.
    So the correct option is C.
  • Question 3
    1 / -0
    Which of the following is activated in stress condition?
    Solution
    • The sympathetic nervous system is activated in stress conditions.
    • The stress response begins in the brain. When someone confronts a danger, the eyes or ears (or both) send the information to the amygdala, an area of the brain that contributes to emotional processing. 
    • The amygdala interprets the images and sounds. When it perceives danger, it instantly sends a distress signal to the hypothalamus.
    • This area of the brain functions like a command center, communicating with the rest of the body through the autonomic nervous system so that the person has the energy to fight or flee.
    • The autonomic nervous system has two components, the sympathetic nervous system, and the parasympathetic nervous system. 
    • The sympathetic nervous system functions like a gas pedal in a car. It triggers the fight-or-flight response, providing the body with a burst of energy so that it can respond to perceived dangers. 
    • The parasympathetic nervous system acts like a brake. It promotes the "rest and digest" response that calms the body down after the danger has passed.

    So the correct answer is option A.
  • Question 4
    1 / -0
    Animals possess nerve network or nervous system to respond to their environment. But the single called Amoeba does not possesses any nerve cell, so, how it come to know whether a particle it encounters is a grain or sand and not its dinner

    Solution
    Although the Amoeba has no  sense organs ,It responds  to chemical stimuli .It make this determination by  chemotaxis ,a kind of chemical sense .This is the same  response mechanism that our whit blood use when  they encounter and phyagocytize a pathogen .
  • Question 5
    1 / -0
    Assertion: Transmission of the nerve impulse across a synapse is accomplished by neurotransmitters.

    Reason: Transmission across a synapse usually requires neurotransmitters because there is small space i.e. synaptic cleft, that separates one neuron from another.
    Solution
    Neurotransmitters need to transmit the nerve impulses through synaptic cleft which is a small part at junction of two neuron.
  • Question 6
    1 / -0
    Nodes of Ranvier are found in
    Solution
    Correct option: B

    Explanation:
    • Nodes of Ranvier are found in Myelinated nerve fibres. The gaps between two adjacent myelin sheaths are called nodes of Ranvier
    • Non-myelinated nerve fibres are enclosed by a Schwann cell that does not form a myelin sheath around the axon. Nodes of Ranvier is absent in them.
      Thus, Option B is correct.

  • Question 7
    1 / -0
    The gap between two myelin sheath is known as:
    Solution
    Myelin sheath surrounds the axon of the nerve cell. It is a fatty white substance. It forms an insulating layer on the axon. It is formed by a process known as myelination. The gap between two myelin sheaths is known as the node of Ranvier. 
    So, the correct answer is option A.

  • Question 8
    1 / -0
    Which one of the following is responsible for the control of reflex action?
    Solution
    A reflex arc is a neural pathway, that controls an action reflex. In higher animals, most sensory neurons do not pass directly into the brain, but synapse in the spinal cord (central nervous system). This characteristic allows reflex actions to occur relatively quickly by activating spinal motor neurons without the delay of sending signals through the brain.
  • Question 9
    1 / -0
    Longest cell in the human body is
    Solution
    The longest cell in the human body is the neuron with a length of 90cm-100cm, linking the central nervous system (brain and spinal cord) to other parts of the body.

    So, the correct answer is option A.
  • Question 10
    1 / -0
    Neuron is different from the muscle, due to the presence of:
    Solution
    Alternate light and dark bands are present only in skeletal muscles. Muscles contain special proteins called contractile proteins. Dendrites are the short cytoplasmic extensions of the cell body of a neuron, which receive stimulus from other neurons. Dendrites are part of a nerve fibre, not a muscle fibre. 
    Thus, the correct answer is option D.
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