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Anatomy of Flowering Plants Test - 42

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Anatomy of Flowering Plants Test - 42
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  • Question 1
    1 / -0
    The protective tissue that suppresses the epidermis in the roots and stems, and undergo secondary growth
    Solution
    During secondary growth in dicots, phellogen or cork cambium produces cork or phellem towards the periphery. The cells lined up below the cork cambium forms phelloderm. The phellogen (cork cambium), phellem (cork) and phelloderm constitute to form the periderm. The multilayered secondary protective dermal tissue called periderm which replaces the epidermis in the roots and stems that undergo secondary growth. So, the correct option is A.
  • Question 2
    1 / -0
    The root hair are produced from 
    Solution
    • The root epidermis is made up of two types of cells, trichoblasts, and atrichoblasts. 
    • Trichoblast cells which are produced by the division of protoderm form tubular outgrowths called root hairs. 
    • These root hairs are involved in the process of absorption and encouragement. 
    • Thus, the correct option is D.
  • Question 3
    1 / -0
    The polyarch (xylem) condition is found in
    Solution
    • The arrangement in which the protoxylem lies outside and metaxylem lies inside is called exarch. 
    • On the basis of number of protoxylem group, roots can be divided into monarch, diarch, triarch, tetrarch or polyarch.
    •  In monocot roots, exarch is found in the polyarch condition i.e many protoxylems (12-20) alternating with phloem.
      So, the correct option is C. 
  • Question 4
    1 / -0
    The vascular bundles are skull shaped in
    Solution
    Vascular bundles in monocot stems are scattered in ground tissue. Each vascular bundle is conjoint, Collateral, endarch and closed. They are skull shaped. 
    Thus, the correct answer is option D.

  • Question 5
    1 / -0
    Which of the following characteristics defines the collateral vascular bundle?
    Solution
    Collateral vascular bundles are characterized by xylem and phloem are lying on the same radius with the xylem located towards the center and phloem located towards the periphery. It is present in a stem.
    So the correct option is 'All of the above'
  • Question 6
    1 / -0
    Find which one of the following is a dead tissue.
    Solution
    1. Parenchyma forms the major component within organs and is closely packed or have intercellular space and are living with the ability of cell division. They perform functions of photosynthesis, storage, and secretion.
    2. Collenchyma is found in the hypodermis in dicot plants and may be oval, spherical or polygonal in shape. It consists of cells which have deposition of cellulose, hemicellulose, and pectin around the corner and provide mechanical support to the plant, helps in bending and provide tensile strength to stem.
    3. Sclerenchyma is a dead, long, narrow cells with thick and lignified cell walls having a few or numerous pits provide mechanical support and are economically important. These are commonly found in fruit wall of nuts, the husk of coconut, seed coat of legumes and jute etc.
    4. Chlorenchyma is the specialized parenchymatous tissue that contains chlorophyll and executes photosynthesis.
    So the correct option is "Sclerenchyma".
  • Question 7
    1 / -0
    The cells of the ................ are polygonal in cross-section and have unevenly thickened walls.
    Solution
    1. Parenchyma forms the major component within organs and is closely packed or have intercellular space and are living with the ability of cell division. They perform functions of photosynthesis, storage, and secretion.
    2. Collenchyma is found in the hypodermis in dicot plants and may be oval, spherical or polygonal in shape. It consists of cells which have deposition of cellulose, hemicellulose, and pectin around the corner and provide mechanical support to the plant, helps in bending and provide tensile strength to stem.
    3. Aerenchyma is the special type of parenchyma that has air in it to provide buoyancy to the plant and helps in floating of the aquatic plant (hydrophytes) as seen in Hydrilla.
    4. Sclerenchyma is long, narrow cells with thick and lignified cell walls having a few or numerous pits provide mechanical support and are economically important. These are commonly found in fruit wall of nuts, the husk of coconut, seed coat of legumes and jute etc.
    So the correct option is "Collenchyma
  • Question 8
    1 / -0
    Cotton clothes are basically cells of
    Solution
    • Cotton clothes are made up of thin fibers which are linked by the cellulosic units. 
    • The cells of cambium are present in cotton clothes. There are thin-walled meristematic cells in the cambium which have no lignin deposition. 
    • This allows the cotton clothes to be soft and comfortable. 
    • Thus, the correct answer is option A. 
  • Question 9
    1 / -0
    Interfascicular cambium is
    Solution
    Interfascicular camblum originates from parenchymatous cells through differentiation of the fascicular cambium. This cambium gives rise to secondary tissues and increase the thickness of the plant body. Secondary meristem is mainly present between primary xylem and primary phloem. Vascular cambium and cork cambium are secondary meristems. Thus the correct answer is option B.
  • Question 10
    1 / -0
    In a vascular bundle, if xylem vessels develop in a centripetal fashion, the xylem is likely to be
    Solution
    In exarch condition, the protoxylem is found outside the metaxylem. Each xylem strand develops inward towards the centre and is thus centripetal in development. 
    When the xylem develops in multiple strands and each strand develops outward towards the periphery of stem, iot is known as endarch condition. This is known as centrifugal manner of arrangement. 
    In mesarch condition, each strand develops from its middle both towards the centre of stem and in the opposite direction towards the periphery. Xylem in leaves develop in this way. 
    In centrarch condition, xylem forms one chamber in the middle of stem with metaxylem surrounding the protoxylem. This is not found in any living plants. 
    Thus, the correct answer is option B. 
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