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Anatomy of Flowering Plants Test - 16

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Anatomy of Flowering Plants Test - 16
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  • Question 1
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    Water containing cavities in vascular bundles are found in _____________.
    Solution
    Stem of maize has water containing cavities in vascular bundles.
  • Question 2
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    Which of the following is not a characteristic feature of the anatomy of dicotyledonous root?
    Solution
    • The anatomical study of a transverse section of the dicotyledonous root shows the presence of bundles and pericycle. 
    • The xylem and phloem that make up the vascular bundles are enclosed by the endodermis. However, the number of vascular bundles is limited to 2-6 or a maximum 8.
    • Vascular bundles of the dicot root are described as radial.
    • Pith is absent in the older root. Secondary growth is present in dicots and absent in monocots.

    So, the correct answer is option D.
  • Question 3
    1 / -0
    Polyarch condition is seen in
    Solution
    • When there are more than four xylem arms, it is called polyarch condition. Monocot roots are usually polyarch. 
    • Bundles of phloem appear alternately with the xylem arms. The xylem contains many lignified cells in older portions of the root. The phloem has cells with thin, unlignified cell walls.
    So, the correct answer is option B.

  • Question 4
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    Vascular bundles are scattered in
    Solution
    In monocot stems, the vascular bundles are dispersed. In dicot stems, the vascular bundles are arranged in ring.
  • Question 5
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    Conjoint and closed vascular bundles with no phloem parenchyma may be observed in
    Solution
    In monocot stem, all the vascular bundles, the xylem and phloem are in the same line; cambium is absent; phloem is external to xylem; protoxylem faces the centre. Hence, the vascular bundles are described as conjoint, collateral, endarch and closed.  
  • Question 6
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    Anatomically fairly old dicotyledonous root is distinguished from the dicotyledonous stem by
    Solution
    In dicotyledonous root, the protoxylem is located near the periphery of the vascular cylinder, i.e. away from the centre (exarch condidtion) and the metaxylem is towards the centre. In dicotyledonous stem, the protoxylem is located near the centre of vascular bundle (endarch condition) and the metaxylem is away from the centre. Hence, Anatomically fairly old dicotyledonous root is distinguished from the dicotyledonous stem by position of protoxylem.
    So, the correct answer is 'Position of protoxylem'
  • Question 7
    1 / -0
    Well-developed pith is found in
    Solution
    The parenchyma in the centre is called the pith. The term stele included the vascular system, associated tissues, and the pith. The protostele is simple, unbranched, centrally located axial strand of xylem interspersed with phloem. A protostele contains no pith. It is generally found in dicot stems and in monocot roots.
    Thus, the correct answer is option D.
  • Question 8
    1 / -0
    Generally hypodermis in monocots is composed of
    Solution
    In monocots, the hypodermis becomes thick and lignified (with lignin) in which the protoplast is not living at maturity. This thick, tough secondary walls are called as sclerenchyma.
  • Question 9
    1 / -0
    The vascular cambial ring of a dicot stem is
    Solution
    Inter-fascicular cambium develops very early during the first year even before the beginning of secondary growth. The activity of the cambium increases their diameter and the vascular bundles become elongated in cross-section. More xylem than phloem elements is produced. Annual rings become clearly visible when vessels with a wide lumen are assembled first (early wood) than vessels with a narrow lumen (late wood).
    Thus, the correct answer is option E.
  • Question 10
    1 / -0
    Collenchymatous hypodermis is a characteristic of
    Solution
    In dicot stem, the cortex is many layered and differentiated into hypodermis and inner cortex. The hypodermis is found below the epidermis and consists of angular collenchyma which is 3-5 layered. 
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