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Anatomy of Flowering Plants Test - 14

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Anatomy of Flowering Plants Test - 14
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  • Question 1
    1 / -0
    Which of the following statements is / are not true?
    A. Cork cambium is otherwise called as phellogen.
    B. Cork is otherwise called as phelloderm
    C. Secondary cortex is otherwise called as periderm.
    D. Cork cambium, cork and secondary cortex are collectively called as phelloderm.
    Solution
    Cork cambium is formed by de-differentiation of  parenchyma cells of the cortex. This cambium is also the called phellogen that produces cork or phellum towards outside or periphery and phelloderm or secondary cortex on the inner side that replaces the earlier or primary cortex. All the three layers together are called phelloderm
    So, the correct answer is 'B and C Only'

  • Question 2
    1 / -0
    Intrafascicular cambium is situated in
    Solution
    Intrafascicular cambium is a primary meristem. It develops from the procambium of the stem apex. It is located inside the open vascular bundles, between phloem and xylem patches. During secondary growth, the derivatives are only secondary phloem and secondary xylem.
    Thus, the correct answer is option C.
  • Question 3
    1 / -0
    Which of the following is not formed from procambium?
    Solution
    • Procambium lies inside of the protoderm and develops into the primary xylem and primary phloem. It also produces the vascular cambium. 
    • A few parenchyma cells of the medullary rays adjacent to intrafascicular cambium dedifferentiate into meristematic cells and form the interfascicular cambium (in between vascular bundle).

    Thus, the correct answer is option D.
  • Question 4
    1 / -0
    In summer, cambium
    Solution
    In spring, the cambium is more active than autumn, producing spring wood or early wood. In each year, two zones of secondary xylem are formed and both can be easily demarcated. These two zones constitute an annual or growth ring. So, cambium is less active in summer and the secondary wood consists of fibres and smaller vessels called summer wood.
    Thus, the correct answer is option C.
  • Question 5
    1 / -0
    Commercial cork is obtained from
    Solution
    Quercus suber is commonly called the cork oak. It is the primary source of cork for bottle stoppers and other uses, such as cork flooring. Cork is composed of suberin, a hydrophobic substance, and because of its impermeable, buoyant, elastic and fire retardant properties, it is used in a variety of products, the most common of which is for wine stoppers.
    Thus, the correct answer is option B.
  • Question 6
    1 / -0
    Promeristem is found in
    Solution
    Promeristems are groups of meristematic cells found in germinating embryos or young seedlings. They give rise to primary meristems which initiate the organ formation process. Promeristems are also referred to as primordial meristems or embryonic meristems because of their origin.
    Thus, the correct answer is option A.
  • Question 7
    1 / -0
    Starch sheath is another name of
    Solution

    The starch sheath is the innermost layer of the cortex. It is homologous to endodermis and is the specialized cells to store starch e.g., Pelargonium stem. Thus, the correct answer is B.

  • Question 8
    1 / -0
    Dead cells of root are supplied by
    Solution
    Quiescent centre are to be found at the tips of growing roots, in the root meristem, and are surrounded by groups of dividing cells. Calyptrogen produces the root cap and supplies the quiescent centre cells.
    Thus, the correct answer is option A.
  • Question 9
    1 / -0
    Girth of a dicot stem is increased by
    Solution
    The inter and intrafascicular cambiums join to form a complete ring of cambium called as vascular cambium, which initiates interstellar secondary growth. The vascular cambial cells continuously divide and the cells produced inward towards pith mature into secondary xylem elements, while those produced outward toward cortex differentiate into secondary phloem elements. Secondary growth in dicot stem occurs by an increase in lateral thickening which increases the girth of the plant.
    Thus, the correct answer is option B.
  • Question 10
    1 / -0
    The tip of the root apical meristem is capped by the histogen known as
    Solution
    The three principal tissues of the root vascular cylinder, cortex and epidermis originate from three groups of initial cells or histogens, in the apical meristem plerome, periblem and dermatogen respectively. A fourth histogen, the calyptrogen produces the root cap.        
    Therefore, the correct answer is option D.
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