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Structural Organisation in Animals Test - 25

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Structural Organisation in Animals Test - 25
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  • Question 1
    1 / -0
    Cell body of a nerve cell contains_____________.
    Solution
    Cyton or cell body of a neuron possesses cytoplasm and nucleus. It contains many organelles, including granules called Nissl granules, which are composed largely of rough endoplasmic reticulum and free polyribosomes. Therefore, option D is correct. 
  • Question 2
    1 / -0
    A characteristic of skeletal muscle is_______________.
    Solution
    Skeletal muscle is a form of striated muscle tissue which is under the control of the somatic nervous system; that is to say, it is voluntarily controlled. 
    Striated muscle gets tired after strenuous exercise after creatine phosphate stores are exhausted. During normal process, creatine phosphate is converted to creatine and phosphate is released to make one ATP from ADP.  But when creatine stores are exhausted after strenuous exercise, then glucose undergoes glycolysis to form pyruvic acid which is then converted to lactic acid which gives rise to ATP and muscle need is fulfilled. But eventually lactic acid builds up in muscle and pH drops and muscle get fatigue.
    Therefore, option D is correct.  
  • Question 3
    1 / -0
    Striated muscles______________.
    Solution
    • Striated muscle gets tired after strenuous exercise because creatine phosphate stores are exhausted. 
    • During the normal process, creatine phosphate is converted to creatine and phosphate is released to make one ATP from ADP. 
    • But when creatine stores are exhausted after strenuous exercise, then glucose undergoes glycolysis to form pyruvic acid, which is then converted to lactic acid, which gives rise to ATP, and muscle need is fulfilled. 
    • But eventually lactic acid builds up in muscle and pH drops and muscle gets fatigued.
    • Striated muscles are voluntary and cylindrical in shape.

    Therefore, option B is correct.  
  • Question 4
    1 / -0
    Which of the following muscles do act involuntarily?
    Solution
    Striated muscles are cylindrical, unbranched, multinucleate and voluntary. These muscles are attached to bones hence, called as skeletal muscles. These muscles are under control of the conscious will.
    Smooth muscles are spindle-shaped, uninucleate, unbranched and involuntary. These muscles are not under control of the conscious will. 
    Cardiac muscle cells are cylindrical, branched, uninucleate and involuntary. These muscles are not under control of the conscious will. 
  • Question 5
    1 / -0
    Select the incorrect sentence.
    Solution
    • Blood is a type of connective tissue in which red blood cells, white blood cells and platelets are suspended in a fluid matrix containing proteins, salts and hormones. 
    • The ligament is a fibrous connective tissue, which connects bone to another bone.
    • Cartilage is a type of connective tissue having widely spaced cells, which are interspersed in the matrix made of proteins and sugars. 
    • Tendon is a tough, fibrous connective tissue, which connects muscle to bone. Tendons have great strength. 
    So, the correct answer is option C.
  • Question 6
    1 / -0
    Squamous epithelium is found in________________.
    Solution
    Squamous epithelial cells are thin, flat cells. Simple squamous epithelium is a single layer of squamous cells, which form a thin, delicate lining. Such lining is generally utilized where the transportation of substances takes place through selective permeability. 
    The trachea is a windpipe, which connects larynx and pharynx to the lungs. Trachea carries the wind to the lungs. So, the trachea need not be having the selectively permeable lining. 
    The intestine is the place where absorption of nutrients takes place. For this function, tall columnar cellular lining is utilized. 
    Oviduct carries out the function of pushing the fertilized ovum or zygote towards the uterus. For this purpose, the inner surface of the oviduct is lined by ciliated epithelium, which moves and pushes the zygote. 
    Lung alveoli perform the function of gaseous exchange. For this purpose, alveoli has a selectively permeable lining of simple squamous epithelial cells. So, the correct option is A.
  • Question 7
    1 / -0
    Which of the following helps in repair of tissue and fills up the space inside the organ?
    Solution
    Areolar tissue is a connective tissue found in between skin and muscles, around blood vessels, nerves, and the bone marrow. It fills the space inside the organ, supports the internal organ, and helps in tissue repair.
    Tendon is a tough fibrous connective tissue that connects muscle to bone.
    Adipose tissue is fat-storing tissue that is present in between the skin and internal organs.  
    Cartilage has widely spaced cells and is interspersed in a matrix made of proteins and sugars. It covers the ends of bones at a joint. 
    So, the correct answer is option C.
  • Question 8
    1 / -0
    A long fibre like process coming out of the cyton of a nerve cell is
    Solution
    • Dendrons are short, branched parts arising from cell body or cyton. Dendrons are many in number. 
    • Neurolemma is the outermost nucleated cytoplasmic layer of Schwann cells. It surrounds the axon of the nerve cell. 
    • Neurofibrils are long, thin, microscopic fibrils that run in every direction in the cell body and also extend in axon and dendrites. 
    • Axon is a long, thin hair-like processes coming out of the cyton of a nerve cell. 
    Hence, option A is correct. 
  • Question 9
    1 / -0
    The neurons are specialised cells for
    Solution
    • The neurons are specialized for the conduction of nerve impulses with the help of synapse. 
    • A synapse is a structure that allows a neuron to pass the electrochemical signal to another neuron. 
    • Hence activity helps in coordinating the various activities of the body.
      Therefore, the correct answer is option A. 
  • Question 10
    1 / -0
    The nervous tissue, which contains densely packed cells are called as
    Solution
    • The densely packed nerve cells present in the brain, spinal cord, and sense organs are called neurons. They are specialized for the conduction of nerve impulses and they are mainly of two types, sensory neurons, and motor neurons.

    So, the correct option is 'Neurons'.
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