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Tissues Test - 93

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Tissues Test - 93
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Tissue which connects skin with underlying muscle is made up of:
    Solution
    Areolar connective tissue is found between the skin and muscles, around blood vessels and nerves, and in the bone marrow. It fills the space inside the organs, supports internal organs, and helps in the repair of tissues.
    Hence, the correct option is D.
  • Question 2
    1 / -0
    Fatty substance found in epidermal cell walls is
    Solution
    • The cuticle is the waxy layer present on the epidermis of the leaf and it reduces the rate of water loss by transpiration in certain higher plants. 
    • It consists of cutin, a waxy, water-repellent substance allied to suberin, which is found in the cell walls of corky tissue.
    • Cutin is especially noticeable in many fruits, e.g., apple, nectarine, and cherry, which can be buffed to a high gloss. 
    • Carnauba wax is derived from the cuticles of the leaves of Copernicia cerifera, a Brazilian palm.
    Thus, the correct answer is option A.
  • Question 3
    1 / -0
    Bulliform cells are:
    Solution
    Correct option: A
    Explanation:

    - Bulliform cells also called motor cells and have a bubble-shaped structure, that appears in groups on the upper covering of the leaves of several monocots.
    - Bulliform cells having the peculiar shape of the bubble. It arises primarily on the upper surface of the leaves in the grasses.
    - The water present in these bulliform cells assists to conserve their structure but the loss of turgor pressure due to stress authorizes the leaves to roll up. During the depletion, the damage of water via the vacuoles induces bulliform cells to shut down.
    - Therefore, the two horizons of the leaves of several grass species are folded towards each other. Once adequate water is available, the leaves open again. Hence, Water filled and highly vacuolated epidermal cell is the correct answer.
  • Question 4
    1 / -0
    Which of the following sclereids are the characteristic of intercellular spaces of Nymphaea?
    Solution
    Astrosclereids are sclereids having  cell wall drawn out into lobes or arms to form a more or less stellate body. They are found in certain xerophytes. Nymphaea contains large intercellular spaces, which occur in the petiole. These airspaces are surrounded by long columns of parenchyma cells. The columnar cells contain chloroplasts and are presumably photosynthetic. Part of a large astroscleried can be seen cutting across one of the parenchymatous fingers. These sclereids add some mechanical strength to fragile structure. 
    Hence the option is D
  • Question 5
    1 / -0
    In grasses, certain adaxial epidermal cells along the veins modify themselves into large empty, colourless cells. These cells are called
    Solution
    Bulliform cells  are so called because of its peculiar bubble shape. It mainly occurs on the upper surface of the leaves present in grasses. Water present in these cells helps to maintain its shape but loss of turgor pressure during the stress allows the leaves to roll up. During drought, the loss of moisture through vacuoles induces bulliform cells to cause the leaves of many grass species to close as the two edges of the grass blade fold up toward each other. Once adequate water is available, these cells enlarge and the leaves open again. 
    Companion cells are specialized parenchyma cell, located in the phloem of flowering plants and closely associated with development and function with a sieve-tube element. 
    Guard cells are cells surrounding each stoma. They help to regulate the rate of transpiration by opening and closing the stomata. 
    The stoma is protected by subsidiary cells that have papillae that arch across the stoma, creating a mini-depression. This will tend to retain escaped water, giving it time to diffuse back into the stoma instead of being immediately blown away by a breeze. 
    Albuminous cells have a similar role to companion cells, but are associated with sieve cells only and are therefore found only in seedless vascular plants and gymnosperms. 
    So, the correct answer is option A.
  • Question 6
    1 / -0
    Multiple epidermis on the dorsal and ventral side of leaf is found in
    Solution
    In xerophytes, like Nerium, the protodermal cells divide periclinally to form multiseriate or multiple epidermises. The outermost layers of multiple epidermises are similar to a simple epidermis. Multiple epidermises in Nerium occur in both the upper and lower surfaces of the leaves. It is a xerophytic adaptation. So, the correct answer is option B.
  • Question 7
    1 / -0
    Periblem forms
    Solution
    Histogen theory (By Hanstein 1870) states that shoot apical meristem consists three distinct zones :
    1. Dermatogen (external layer) forms the outer covering of all organ of the plant. 
    2. Periblem (middle layer) gives rise to the cortex and endodermis. 
    3. Plerome (central layer) forms pith and primary vascular bundle. 
    Thus, option C is correct.
  • Question 8
    1 / -0
    Blood differs from the other connective tissues because
    Solution
    • Though blood is like a connective tissue within the vertebrate body, this is different from the other connective tissues. Blood is actually the bodily fluid that delivers the necessary nutrients and oxygen to the cells of the body and carries away all the metabolic wastes from it. 
    • In vertebrates, blood is made up of RBCs, WBCs, platelets suspended in blood plasma. Further, these blood cells are formed in the bone marrow through a process called hematopoiesis. 
    • Blood plasma is actually 92% water and 8% plasma proteins which are produced in the liver. Fibers are absent in the blood.
    Hence, the correct option is D.
  • Question 9
    1 / -0
    The term periderm is used to denote
    Solution
    The periderm is the secondary protective dermal tissue that replaces the epidermis during growth in thickness of stems and roots of gymnosperms and dicotyledons i.e., secondary growth. 
    Unlike typical epidermis, the periderm is a multilayered tissue system, the bulk of which usually constitutes the cork or phellem. It also has secondary cortex.
    Hence the correct option is C.
  • Question 10
    1 / -0
    Nissl granules are mostly present in 
    Solution
    A Nissl body is a large granular body found in neurons. These granules are rough endoplasmic reticulum (RER) with rosettes of free ribosomes and are the site of protein synthesis. These are present in cyton of the nerve cell.
    So, the correct answer is option B.
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