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Tissues Test - 31

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Tissues Test - 31
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  • Question 1
    1 / -0
    The areolar tissue connects:
    Solution
    • Areolar tissue is loose connective tissue found between skin and muscles.
    • It is found in many locations around the body. One important area is the skin, which binds the outer layers of the skin to the muscles beneath. 
    • It also helps fill space in organs and provides support.

    So, the correct answer is option D.
  • Question 2
    1 / -0
    The mast cells secrete which of the following substances?
    Solution
    Mast cells are scattered throughout the connective tissues of the body and they mediate inflammatory responses such as hypersensitivity and allergic reactions. Mast cells secrete a number of different chemical mediators including heparin, histamine, serotonin, interleukins, proteoglycan (like heparin) and various enzymes in coarse granules found throughout the cytoplasm of cells.
    Thus, the correct answer is option D.
  • Question 3
    1 / -0
    The innermost layer of cortex which has casparian thickenings in its cells is the
    Solution
    The innermost cortical layer is called endodermis. Its cells are barrel-shaped and are closely packed. These cells are suberized on their radial and inner walls. These thickenings are called casparian stripes and are found in dicot root.
  • Question 4
    1 / -0
    Which one of the following contains the largest quantity of extracellular material?
    Solution
    Correct option: C

    Explanation:
    • The non-cellular portion of a tissue which secrete extracellular materials into the surrounding cells is called extracellular matrix. It is made up of proteins, glycosaminoglycan, and glycoconjugate., which provides structural and biochemical support to the surrounding cells.
    • Areolar tissue is made of cells embedded in large quantity of extracellular matrix (fibers and ground substance). It includes protein fibres such as collagen, elastin, reticulate and ground substances like water and organic molecules.
      Thus, Option C is correct.
  • Question 5
    1 / -0
    Below the skin, the fat is in the form of ____________.
    Solution
     Fat is stored in adipose tissue found below the skin and between internal organs. The cells of this tissue are filled with fat globules. The storage of fats also lets it act as an insulator thus preventing the loss of body heat.
    So, the correct answer is option B.
  • Question 6
    1 / -0
    Major constituent of bone is:
    Solution
    The mineral constituent of bone is composed of a salt of calcium and phosphorus called calcium phosphate. This makes the bony framework hard and strong.
    Thus, the correct answer is option A.
  • Question 7
    1 / -0
    Which statement is incorrect?
    Solution
    Mast cells and basophils are major cells in the early phases of immediate hypersensitivity reactions. Mast cell is very similar to basophils in functions. Both are granulated cells, that contain heparin and histamine, which are anticoagulant. So, option A is correct. Mast cells are long lived cells, while basophils are short lived (compared to mast cells). So, option B is correct. Mast cells are fixed in tissues, while the basophils circulate in blood. So, option D is correct. Mast cells are bigger than basophils. They are 10uM in size and have round nuclei. So, option C is incorrect.
    Thus, the correct answer is option (C), 'Mast cells are smaller than basophils with a bilobed nucleus'.
  • Question 8
    1 / -0
    Which of the following is a loose connective tissue?
    Solution
    • Areolar tissue is a type of connective tissue, that takes part in the structural framework of the body. 
    • It consists of a meshwork of collagen, elastic fibers, and reticular fibers with many connective tissue cells in between the meshwork of fibers. 
    • Fibroblasts, plasma cells, adipocytes, mast cells, and macrophages are the major cells of the areolar tissue. 
    • Adipose tissue helps in the storage of fat and protects the internal organs from injury.  
    • Both of them belong to the class of loose connective tissue.
    • On the other hand, blood is a type of fluid connective tissue.

    Hence, the correct option is D.
  • Question 9
    1 / -0
    A connective tissue
    Solution
    Correct option: C

    Explanation:
    • Connective tissues are most abundant and widely distributed in complex animal bodies. They range from soft connective tissues to specialized connective tissues like cartilage, bone, adipose and blood.
    • Except in blood, the fibres of collagen secrete polysaccharides, which accumulate between the cells and forms an abundant matrix or ground substance.
      Thus, option C is correct.
  • Question 10
    1 / -0
    Which of the following cells is not phagocytic in nature?
    Solution
    • Phagocytes are derived from stem cells in the bone marrow. Phagocytes of humans and other jawed vertebrates are divided into "professional" and "non-professional" groups based on the efficiency with which they participate in phagocytosis. 
    • The professional phagocytes are the monocytes, macrophages, neutrophils, tissue dendritic cells, and mast cells. The non-professional phagocytes are the epithelial and endothelial cells.
    • Red blood cells do not possess phagocytic activity. RBC carries oxygen to different cells in the body.

    Thus, the correct answer is option B.
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