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Anatomy of Flowering Plants Test - 53

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Anatomy of Flowering Plants Test - 53
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  • Question 1
    1 / -0
    Accessory cambia are
    Solution
    Accessory cambia are the secondary meristem that develops in both the stem and root in Amaranthus, Boerhaavia, Mirabilia, Dracaena. These give rise to the secondary vascular bundles and the conjunctive tissues. 
    A. Intercalary meristem is the primary meristem.
    B. Accessory cambia are the secondary meristem.
    C. Shoot apical meristem and the Root apical meristem are the primary meristems
    So, the correct answer is 'Secondary Meristems'
  • Question 2
    1 / -0
    Apical meristem divides to form, three meristematic regions
    Solution
    • The shoot apical meristem (SAM) of a plant form three distinct meristematic zones called the histogens.
    • Each of these histogens gives rise to tissues which are different from one another- dermatogen, periblem, plerome (principle tissues)
    • The root apical meristem gives rise to three primary meristems- procambium, ground meristem, protoderm and the root cap. 
    • Calyptrogen is a specialized internal meristematic cell derived from the root apical meristem.
    • So, the correct answer is 'Protoderm, procambium and ground meristem'.
  • Question 3
    1 / -0
    The change that occurs is apex at the time of flowering is
    Solution
    • At the time of flowering, the vegetative shoot apex transforms into reproductive shoot apex (reproductive phase).
    • This transformation of shoot apex is induced by florigen and light.
    • The summit zone of reproductive shoot apex is active as the rate of cell division is greater and it forms stamens & carpels.
    • Whereas, the flank zone is less active in reproductive shoot apex and it forms sepals and petals.
    • So, the correct answer is 'Vegetative apex changes into reproductive apex'.
  • Question 4
    1 / -0
    Cambium produces growth in
    Solution
    • In vascular plants, the secondary growth occurs due to the activity of the two lateral meristems- the cork cambium and the vascular cambium.
    • The secondary growth in plants occurs due to the cell division in the lateral meristems or secondary meristems that helps to increase the thickness or the girth of the plants
    • So, the correct answer is 'Girth'
  • Question 5
    1 / -0
    Vegetative shoot apex or stem apical meristem is
    Solution
    • Vegetative shoot apex-It consists of two regions i.e, summit and flank.
    a) Summit-  The rate of division is slow and it is located at the apex.
    b) Flank- The rate of division is very fast and it lies behind the summit.
    • Leaf primordium is formed by the flanks.
    • The vegetative shoot apex is conical or dome-shaped.
    • So, the correct answer is 'Conical'
  • Question 6
    1 / -0
    Cork cambium represents
    Solution
    • The cork cambium is also known as phellogen that forms a layer of cells which produces a secondary protective layer of the stem called the periderm.
    • This periderm consists of-
    1) phelloderm os the innermost layer composed of living parenchyma cells.
    2) phellogen gives rise to periderm.
    3) phellem or cork is the air-filled protective tissue on the outer side.
    • It is a type of lateral meristem or secondary meristem which helps in increasing the girth of the plants.
    • So, the correct answer is 'Secondary meristem'.
  • Question 7
    1 / -0
    Vascular cambium of stem is
    Solution
    • In vascular plants, the secondary growth occurs due to the activity of the two lateral meristems- the cork cambium and the vascular cambium.
    • In woody plants, the secondary growth produces wood and gives shapes to the plant with a thickened trunk.
    • The vascular cambium is also known as fascicular cambium which develops within the vascular bundles that produce xylem to the inner side and phloem to the outer side.
    • The vascular cambium is responsible for only secondary growth.
    • So, the correct answer is 'Secondary meristem'
  • Question 8
    1 / -0
    Apical meristem of root is present
    Solution
    Root apical meristem is the primary meristem that is present in both the tap root system and the adventitious root system. It is present behind the root cap, and so it is sub-apical in position. In some roots, there occurs the quiescent centre that has metabolically inactive cells. This region acts as the reservoir of the cells to the meristem
    So, the correct answer is 'In all the roots'
  • Question 9
    1 / -0
    ________ is an example of secondary meristem.
    Solution
    • The secondary meristems are responsible for secondary growth in plants.
    • They are also known as the lateral meristems as they surround the stem of a plant and help them to grow laterally i.e, increase in the radii.
    • Vascular cambium produces secondary xylem and secondary phloem.
    • Cork cambium or phellogen forms a layer of cells which produces a secondary protective layer of the stem called the periderm.
    • Phellem or the cork is a tissue formed to the outer side of cork cambium which is composed of dead cells and is protective in function.
    • Cork cambium is a secondary meristem
    • So, the correct answer is 'Cork cambium'
    • Question 10
      1 / -0
      Active divisions occur in the cells of 
      Solution
      • The cambium is a layer of actively dividing cells present between xylem and phloem tissues.
      • They are responsible for the secondary growth of stems and roots i.e, helps in increasing the girth or thickness in plants.
      • The cambium is a single layer of initial cells which actively divide to form several cell layers that are collectively called the cambial zone. 
      • The cambial cells divide continuously to produce secondary xylem cells towards the centre of the stem and secondary phloem cells toward the outer side.
      • These cambial cells originate from the undifferentiated meristematic cells which have retained the embryonic capacity for continued growth and differentiation. 
      • Xylem, phloem (compound tissue) and collenchyma (simple tissues) are permanent tissues which have lost the ability to divide.
      So, the correct answer is 'Cambium'.
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