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Structural Organisation in Animals Test - 71

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Structural Organisation in Animals Test - 71
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  • Question 1
    1 / -0
    Earthworm has no special sense organs, still they are sensitive to
    Solution
    In earthworms there are specialised nerves with photoreceptors in the nerve endings present in the skin and the impulses from these nerves are carried rapidly to the muscles of the earthworm. This makes them sensitive to stimuli such as light and sound. 
    So, the correct option is 'Light and sound'.
  • Question 2
    1 / -0
    The efferent salivary duct opens at
    Solution
    • The common duct receives the duct from two receptacles and transforms into a spacious efferent salivary duct 
    • The efferent salivary duct opens at the base of the hypopharynx, which is situated on the floor of the buccal cavity.
    So, the correct option is 'reservoir'.
  • Question 3
    1 / -0
    Which of the following muscles do not get fatigued fast?
    Solution
    The cells of cardiac muscles have a greater number of mitochondria than the cells present in other muscles. So, the cells of cardiac muscles get plenty of energy, produced by mitochondria. Mitochondria are responsible for the production of energy. Therefore, cardiac muscles do not get fatigued.
    So, the correct answer is option B.
  • Question 4
    1 / -0
    Which of the following segments are called forest of nephridia?
    Solution
    The correct answer is A.
    In a mature earthworm, segments 14 to 16 are covered by a prominent dark band of glandular tissues called clitellar segments. The excretory organs occur as segmentally arranged coiled tubules called nephridia. They are of three types, among them the forest of nephridia attached to lining of the body wall of segment 14 to 16.
  • Question 5
    1 / -0
    Flow of blood in the ventral vessel of earthworm is _____________.
    Solution
    The earthworm has a closed circulatory system. An earthworm circulates blood exclusively through vessels. There are three main vessels that supply the blood to organs within the earthworm. These vessels are the aortic arches, dorsal blood vessels, and ventral blood vessels. The aortic arches function like a human heart. There are five pairs of aortic arches, which have the responsibility of pumping blood into the dorsal and ventral blood vessels. The dorsal blood vessels are responsible for carrying blood to the front of the earthworm’s body. The ventral blood vessels are responsible for carrying blood to the back of the earthworm’s body.
    So, the correct option is 'Backwards'.
  • Question 6
    1 / -0
    Mark the incorrect statement regarding cardiac muscles.
    Solution

    Cardiac muscles are involuntary and intrinsically controlled, striated, branched, and single nucleated. They are to be an involuntary tissue because it is controlled unconsciously by our brain. 

    Thus, the correct answer is 'They do not show striations'.
  • Question 7
    1 / -0
    Squamous epithelium forms inner lining of which of the following?
    I. Blood vessels
    II. Lung alveoli
    III. Salivary duct
  • Question 8
    1 / -0
    If we cut the section of earthworm from segment 44, which contents will not be visible?
    Solution
    Blood glands are present in the 4th, 5th and 6th segments of an earthworm. The brain and various ganglia of the earthworm are located in the first 5 segments of its body. However, the dorsal and ventral blood vessels run all along the body of the animal.
    So, the correct answer is 'Blood glands'.
  • Question 9
    1 / -0
    Which structure is not related with respiration in frog?
    Solution
    Being an amphibian, the frog shows different modes of respiration based on environmental and physiological conditions. Frogs mainly respire either via their skin, mouth, lungs, or gills. Adult frogs lose their gills and respire via lungs, skin and their mouth. The lack of a diaphragm makes them use their mouth, nostrils, and mouth to expel gases.

    So, the correct answer is 'Diaphragm'.
  • Question 10
    1 / -0
    In which blood vessel blood flows posterior end to anterior end
    Solution
    Dorsal blood vessel runs mid-dorsally above the alimentary canal from the posterior to the anterior end of the body. It is the thickest vessel with contractile muscular walls visible from outside as a dark line through the thin and semi-transparent body wall. The direction of flow of blood in this vessel remains from behind to forward (from posterior to anterior).
    So, the correct option is 'Dorsal blood vessel'.
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