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Structural Organisation in Animals Test - 32

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Structural Organisation in Animals Test - 32
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  • Question 1
    1 / -0
    Simple epithelium is made up of
    Solution
    Simple epithelium is one cell thick, i.e., every cell is in direct contact with the underlying basement membrane. It consists of compactly packed cells. In general, it is found where absorption and filtration occur.
    Hence the correct option is D.
  • Question 2
    1 / -0
    The terminal bronchioles initially have 
    Solution
    The epithelium of the bronchioles starts with a simple ciliated columnar epithelium. As the bronchioles decreases in size, the epithelium changes to simple ciliated cuboidal epithelium.
  • Question 3
    1 / -0
    Histiocyte of brain is a
    Solution
    Microglia is referred to as the histiocytes of the central nervous system. It constitutes 10–15% of all cells found in the brain. These long-lived cells undergo very little turnover in normal physiological states. Microglia helps to sense various types of danger and differentially react with a classical or alternative reparative response. Hence, option B is correct.
  • Question 4
    1 / -0
    Volkmann canal interconnects
    Solution
    Volkmann canal interconnects Haversian canals. Volkmann canals are also known as perforating holes .Volkmann canals are inside osteons. The Haversian canals, interconnect the latter with each other and the periosteum. They usually run at obtuse angles to the Haversian canals and contain anastomosing vessels between Haversian capillaries. 
    Hence the correct option is D.
  • Question 5
    1 / -0
    Which of the following is true statement for leeches?
    Solution
    Leeches are segmented worms that belong to the phylum Annelida. Leeches are ectoparasites, they attach to the host body and suck blood. Their bodies are much more solid as the spaces in their coelom are dense with connective tissues. The majority of leeches live in freshwater environments, while some species can be found in terrestrial and marine environments as well. So, the correct answer is option D.
  • Question 6
    1 / -0
    Which animal do not possess larval stage in its life cycle?
    Solution
    Earthworms belong to an Annelida which reproduces sexually. Cocoon contains many fertilised eggs but only one embryo completes development, while other ova serve as nurse cells. The development is direct without a free larval stage. After the development of 2-3 weeks, the young worm crawls out of the cocoon. So, the correct answer is option D.
  • Question 7
    1 / -0
    Largest earthworm is 
    Solution
    Megascolex belongs to class Oligochaeta from the family Megascolecidae. Members of this family are large earthworms. They are found in Australia, New Zealand, Southeast Asia and North America. Hence, option C is correct.
  • Question 8
    1 / -0
    Collagen and elastin are formed by
    Solution
    A fibroblast is a type of cell that synthesises the extracellular matrix and collagen - the structural framework or stroma for animal tissues and plays a critical role in wound healing. Fibroblasts are the most common cells of connective tissue in animals. These cells synthesises both collagen and elastin.
    So, the correct answer is 'Fibroblasts'
  • Question 9
    1 / -0
    Hypodermis of human skin is composed of:
    Solution
    The hypodermis is the subcutaneous layer lying below the dermis; it consists largely of fat cells (adipocyte cells). It provides the main structural support for the skin, as well as insulating the body from cold and aiding shock absorption. It is interlaced with blood vessels and nerves.
    So, the correct answer is option B.

  • Question 10
    1 / -0
    Strongest muscles are
    Solution
    Muscular strength usually refers to the "ability to exert a force on an external object". The strongest muscle in humans, based on its weight is the masseter muscle or the jaw muscle. It is the muscle that can generate the largest externally measurable force attributable to the action of a specific, single muscle. Its strength is the result of incredibly densely packed muscle fibers combined with being attached to a short-armed lever. With all muscles of the jaw working together it can close the teeth with a force as great as 55 pounds (25 kilograms) on the incisors or 200 pounds (90.7 kilograms) on the molars.
    Hence the correct option is D.
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