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Structural Organisation in Animals Test - 22

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Structural Organisation in Animals Test - 22
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  • Question 1
    1 / -0
    Which of the following is regarded as a unit of nervous tissue?
    Solution
    A neuron is the structural and functional unit of the nervous system. Neurons are similar to other cells in the human body in a number of ways, but there is one key difference between neurons and other cells. Neurons are specialized to transmit information throughout the body.
    Thus, the correct answer is the option (C), 'Neurons'.
  • Question 2
    1 / -0
    Primary function of enteronephric nephridia of Pheretima
    Solution
    Primary function of enteronephric nephridia of pheretima is excretion of nitrogenous waste. Nephridia is an excretory organ which is analogous to kidney of vertebrate. Nephridia are porous,long,thin and coiled tube.

    Hence, the correct option is 'Excretion of nitrogenous waste'.
  • Question 3
    1 / -0
    The epithelial tissue present on the inner surface of wind pipe and oviduct is _________.
    Solution
    The ciliated epithelium is found in the inner surface of the wind pipe and oviduct. The ciliated epithelium cells are columnar epithelial cells with cilia. 
    So the correct option is ciliated.
  • Question 4
    1 / -0
    Earthworms are -
    Solution
    Correct Answer: D
    Explanation:

    • Ammonotelic organisms are the organisms that excrete nitrogenous waste substances in the form of ammonia.
    • A ureotelic organism excretes excess nitrogen as urea.
    • Earthworm is both ureotelic and ammonotelic.
    • It excretes waste in the form of urea when present in soil because of less water available in the soil.
    • It turns ammonotelic when it is present in aquatic habitat as there is plenty of water so it can easily dissolve in water.
  • Question 5
    1 / -0
    In which one of the following preparations are you likely to come across cell junctions most frequently?
    Solution

    Tight junctions are mainly found in epithelial tissues lining the stomach, intestines, and urinary bladder which also happen to have ciliated surfaces. Various ciliated epithelial surfaces have adhering junctions too.

    So,  the correct answer is 'Ciliated epithelium'.

  • Question 6
    1 / -0
    Hypertrophy of muscle is the condition wherein
    Solution
    Muscle hypertrophy is a term for the growth and increase of the size of the muscle cells. The most common type of muscular hypertrophy occurs as a result of physical exercise such as weight lifting.
    When someone starts exercising, there is an increase in the nerve impulses that cause muscle contraction. This results in strength gains without noticeable change in muscle size.
    As one continues to exercise, there is a complex interaction of nervous system responses, that result in an increase in protein synthesis over months and the muscle cells begin to grow larger and stronger.
    Thus, the correct answer is option B.
  • Question 7
    1 / -0
    The unit of photo reception, in a compound eye of cockroach and other insects, is
    Solution
    Arthropod eyes are made up of repeating units of the ommatidia, each of which functions as a separate visual receptor. It contains a cluster of photoreceptor cells surrounded by support cells and pigment cells.
    So, the correct answer is option C.
  • Question 8
    1 / -0
    In which one of the following organisms the excretory organs are correctly stated?
    Solution
    Nephridia is a tubule open to the exterior which acts as an organ of excretion or osmoregulation of earthworm. They are of three types, namely, septal, integumentary and pharyngeal. A septal nephridium consists of nephrostome or ciliated funnel that drains coelom. Integumentary nephridia lie scattered in the body wall of each segment, except the first two. Pharyngeal nephridia are located on either side of pharynx and oesophagus in segments 4-6.  
    So, the correct answer is option B.
  • Question 9
    1 / -0
    Shivering, when in cold water is caused by
    Solution
    The muscles are capable of utilizing only about 20% to 40% of energy in their mechanical work, liberated from glucose. The unutilized energy is lost as 'heat' dissipated into the environment. This heat helps in maintenance of body temperature.
    Shivering with colds in winters is caused by a quick involuntary reaction of striated muscles. It yields some heat just to warm the body.
    Thus, the correct answer is option C.
  • Question 10
    1 / -0
    Which of the following is absent in the segment of cockroach's leg

    Solution
    Each leg of cockroach is consist of five segments i.e., basal flat cox a,a small trochanter a long femur, a slender spiny tibia, and the foot tarsus.
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