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Anatomy of Flowering Plants Test - 68

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Anatomy of Flowering Plants Test - 68
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  • Question 1
    1 / -0
    In a dicotyledonous stem, the sequence of tissues from the outside to the inside is
    Solution
    In a dicotyledonous stem, the sequence of tissues from the outside to the inside is Phellem-endodermis-pericycle-phloem. Phellem is the cork tissue that replaces the epidermis after secondary growth. Endodermis is outer to the pericycle. Interior to the pericycle the xylem and phloem are present.
    Hence, the correct answer is 'Phellem-endodermis-pericycle-phloem'.
  • Question 2
    1 / -0
    Vascular bundles in which phloem is found on both sides of xylem are called
    Solution
    Vascular bundles in plants are made up of conducting tissues of the xylem and the phloem.
    A. Amphicribal are the concentric vascular bundles where phloem surrounds the xylem and xylem is interior to the phloem.
    B. Radial vascular bundles have xylem and phloem present on different radii.
    C. Bicollateral vascular bundles have xylem and phloem present on the same radius and phloem is found on both the sides of xylem.
    D. Collateral vascular bundles have xylem and phloem present on the same radius and phloem is present on the outer side of the xylem.
    Hence, the correct answer is 'Bicollateral'.
  • Question 3
    1 / -0
    The nature of pericycle above the phloem in dicot stem is 
    Solution
    The pericycle is a thin layer located between the endodermis and phloem in plant roots. In dicot stems, it is located around the ring of vascular bundles in the stele. The nature of pericycle is sclrenchymatous. 
    Thus, the correct answer is 'Sclerenchymatous.'
  • Question 4
    1 / -0
    Vascular cambium is completely secondary in origin in
    Solution
    The cambium that lies between xylem and phloem is called as intrafascicular cambium. The cambium that is secondary in origin is called as interfascicular cambium. In dicot stem, the vascular cambium is partially primary and partially secondary. In dicot root, vascular cambium is completely secondary in origin. 
    Thus, the correct answer is 'Dicot root.'
  • Question 5
    1 / -0
    Figure shows which type of vascular bundle?

    Solution
    The figure is showing the conjoint type of vascular bundle. In this vascular bundle, the phloem and xylem lie together on the same radius with phloem on the outer side and xylem towards the inner side. Vascular cambium occurs in between xylem and phloem. This strip of vascular cambium later produces secondary tissues.

    So the correct answer is 'Conjoint type'.
  • Question 6
    1 / -0
    Which one of the following is a nucleate cell?
    Solution
    Sieve tube cells are responsible for carrying carbohydrates in plants and they lose their nucleus at maturity.
    Companion cells are parenchymal cells and are found in the phloem cells of a plan. These are nucleated cells that apparenty function with the sieve tube elements.
    Medullary rays are parenchymal cells in plants running radially through the vascular tissues in the roots and stems and transport food materials and are non-nucleated.
    So, the correct answer is 'Companion cells'.
  • Question 7
    1 / -0
    Cork cambium is a meristematic tissue that arises as a result of dedifferentiation of ________ in dicot roots.
    Solution

    Cork cambium is the lateral meristem. It is a secondary meristem that means it has formed after the dedifferentiation of the parenchymatous cells. The parenchyma cells of the epidermis give rise to the cork cambium, which then divides to form cork cells on the outer side and secondary cells on the inner side. Hence, the correct answer is ‘Epidermal cells’

  • Question 8
    1 / -0
    Mark the odd one w.r.t T.S. of a plant's part

    Solution
    • The given figure shows the transverse section of the dicotyledonous stem. The epidermis is the outermost protective layer of the stem and it is covered with a thin layer of cuticle. The multiple layers arranged between the epidermis and pericycle constitute the cortex regions. 
    • Cortex is composed of three layers hypodermis, cortical cells, endodermis. The innermost layer is called the endodermis. The cells of the endodermis are rich in starch and cells have deposition of water-impermeable waxy material called suberin.  Vascular bundles are arranged in the ring. 
    • The pericycle is the outermost covering of stele, it is represented by a few layers compactly arranged sclerenchymatous cells.
  • Question 9
    1 / -0
    In a monocot stem, the vascular bundles are?
    Solution
    In a monocot stem, a large number of vascular bundles lie scattered throughout the ground tissue and peripheral bundles are generally smaller than the centrally located ones. The vascular bundles are conjoint, collateral but closed.

    So, the correct answer is 'Scattered in ground tissue'.
  • Question 10
    1 / -0
    Ploem fibre (Bast fibre) are generally absent in 
    Solution
    Bast fibers are made up of sclerenchymatous cells and are absent in primary phloem but present in secondary phloem of dicots and are elongated , unbranched and have pointed needle like apices and are devoid pf protoplasm at maturity and dead.
    So the correct option is 'Primary Phloem'.
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