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Tissues Test - 56

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Tissues Test - 56
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  • Question 1
    1 / -0
    A nerve is composed of
    Solution
    A nerve is composed of nerve fiber bundles. A nerve fiber is a threadlike extension of a nerve cell and consists of an axon and myelin sheath (if present) in the nervous system. There are nerve fibers in the central nervous system and peripheral nervous system. A nerve fiber may be myelinated and/or unmyelinated. In the central nervous system (CNS), myelin is produced by oligodendroglia cells.
    Muscle tissue is a soft tissue that gives rise to muscles and has ability to contract. 
    Bundle sheath cells is a layer of cells in plant leaves and stem that forms a sheath surrounding the vascular bundles.
    Therefore, the correct answer is option B.
  • Question 2
    1 / -0
    Long, cylindrical, unbranched muscle fibres with light and dark bands are______
    Solution
    Skeletal muscles are characterized by long cylindrical fibres which are unbrached and multinucleated.
    Smooth muscle tissue occur in the gut and other internal organs and not under voluntary control. They are spindle shaped and uninucleated.
    Cardiac muscle (heart muscle) is involuntary, striated muscle that is found in the walls of the heart. It is cylindrical but branched. 
    Therefore, the correct answer is option B.
  • Question 3
    1 / -0
    Bone matrix is rich in _____________________
    Solution
    Bone matrix is the intercellular substance of bone tissue consisting of collagen fibers, ground substance, and inorganic bone salts. It is the flexible protein matrix in which minerals such as calcium and phosphorus are deposited and form bones. 
    Therefore, the correct answer is option C.
  • Question 4
    1 / -0
    In desert plants, the epidermis has a thick waterproof coating of____________
    Solution
    • In deserts, water is scarce and saving water is essential for plant growing in such conditions. 
    • In many of the desert plants like Yucca, creosote, cactus, etc, the epidermis has a thick waxy coating of cutin which acts as a waterproof covering.
    • This restricts the loss of water by transpiration. 

    Therefore, the correct answer is option A.
  • Question 5
    1 / -0
    External protective tissues of plants are_____________
    Solution
    • The epidermis is a single layer of cells that covers the leaves, flowers, roots and stems of plants. It forms a boundary between the plant and the external environment. 
    • Cork cambium is a tissue found in many vascular plants as part of the periderm. The cork cambium is a lateral meristem and is responsible for secondary growth that replaces the epidermis in roots and stems.
    • The pericycle is a cylinder of parenchyma or sclerenchyma cells that lies just inside the endodermis and is the outer most part of the stele of plants. 
    • Cortex, in plants, the tissue of unspecialized cells lying between the epidermis (surface cells) and the vascular, or conducting, tissues of stems and roots. 

    Therefore, the correct answer is option C
  • Question 6
    1 / -0
    The speed at which impulses are conducted increases with  
    Solution
    Dendrites are the small extension of nerve cells that receive signals from sensory receptors or other neurons. The nerve impulse is not conducted by them. 
    The long extension of the cell body of the nerve cell is called as axon that serves to conduct the nerve impulse away from the cell body. The increased diameter of axon results in reduced resistance to local current flow which in turn causes the action potential at its one site to activate the adjacent site. 
    Soma is the metabolic center of the nerve cell where the metabolic contents are manufactured. It is not involved in nerve impulse conduction. 
    Thus, the correct answer is option B.
  • Question 7
    1 / -0
    Abnormal increase in RBC count is called as
    Solution
    Anemia or anaemia is usually defined as a decrease in a number of red blood cells (RBCs) or hemoglobin in the blood. Polycythemia is a condition that results in an increased level of circulating red blood cells in the bloodstream. Pneumonia is a lung infection causing cough, fever and breathing problems. Leukemia is a group of cancers that usually begin in the bone marrow and result in high numbers of abnormal white blood cells. Therefore, the correct answer is option D.
  • Question 8
    1 / -0
    The abnormal increase in the total RBC count is referred to as
    Solution
    Polycythemia is a condition that results in an increased level of circulating red blood cells in the bloodstream. People with polycythemia have an increased hematocrit, hemoglobin or red blood cell counts. 
    Leucopenia is a reduction in the number of white cells in the blood. 
    Anaemia is a deficiency in the number or quality of red blood cells. Lack of iron is common in anaemic people. 
    Pneumonia is an inflammatory condition of the lung affecting primarily the microscopic air sacs known as alveoli. 
    Thus, the correct answer is option B.
  • Question 9
    1 / -0
    Myoglobin is found in:
    Solution
    Myoglobin is found in red fibers.
    Myoglobin contains a heme (prosthetic) group which is responsible for its main function of carrying the oxygen molecules to muscle tissues. Myoglobin can exist in the oxygen-free form, deoxymyoglobin, or in a form in which the oxygen molecule is bound, called oxymyoglobin.
    Myoglobin is an iron and oxygen-binding protein found in the muscle tissue of vertebrates for eg. mammals. It is related to hemoglobin, which is the iron and oxygen-binding protein in the blood, specifically in the red blood cells. In humans, myoglobin is only found in the bloodstream after muscle injury.
    So, the correct answer is 'Red fibers'.
  • Question 10
    1 / -0
    Endothelium of the inner surface of blood vessels in vertebrates is
    Solution
    Simple squamous epithelium that lines the blood vessels is called the endothelium. It is the thin layer of cells lining the interior surface of blood vessels, forming an interface between circulating blood in the lumen and the rest of the vessel wall. Endothelial cells line the entire circulatory system, from the heart to the smallest capillary. These cells reduce turbulence of the flow of blood allowing the fluid to be pumped farther. 
    Hence the correct option is A.
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