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Anatomy of Flowering Plants Test - 15

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Anatomy of Flowering Plants Test - 15
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  • Question 1
    1 / -0
    The length of a plant axis increases by
    Solution
    Meristems which occur at the apices of the stem, root and other branches are called as apical meristems, which bring about the primary growth of the plants, hence, also called as primary meristems. Apical meristem is responsible for the increase in the length of the plant.
    Thus, the correct answer is option A.
  • Question 2
    1 / -0
    Cork cambium is otherwise called as 
    Solution
    During extrastellar secondary growth, the epidermis and pericycle with parenchyma or collenchyma cells acquire secondary meristematic property by de-differentiation and is called as phellogen or cork cambium. The inner derivatives of cork cambium remain living and differentiate into parenchyma or collenchyma.  This newly formed inner zone is called secondary cortex or phelloderm. Cork is formed from phellogen. The phellem (cork), phellogen (cork cambium) and phelloderm together form the periderm. 
    Thus, the correct answer is option D.
  • Question 3
    1 / -0
    The interfibrillar material of the secondary wall is chiefly made up of
    Solution
    Lignin is a class of complex organic polymers that form important structural materials in the support tissues of vascular plants. Lignins are particularly important in the formation of cell walls, especially in wood and bark, because they lend rigidity and do not rot easily. Most plants exhibit an increase in girth, apart from primary growth. This increase is called secondary growth. The tissues involved are the two lateral meristems: vascular cambium and cork cambium. The cambium possess hard and extremely thick secondary walls due to uniform deposition of lignin.
    So, the answer is C.
  • Question 4
    1 / -0
    Fibres are obtained from
    Solution
    Sclerenchyma cells are mainly of two types - fibres and sclereids. Fibres are long, spindle shaped structures, with tapering or blunt ends. Fibres are grouped into xylary fibres and extraxylary fibres. Xylary fibres, also called as wood fibres are parts of xylem and are longest among xylem elements. Extraxylary fibres are classified as bast or phloem fibres, cortical fibres and perivascular fibres (peripheral to the vascular bundles).  
    Thus, the correct answer is option A.
  • Question 5
    1 / -0
    The distinct cavities (lacunae) found in a mature vascular bundle of maize stem are formed due to

    Solution
    In a completely mature vascular bundle a schizolysigenous cavity is formed by disintegration of protoxylem. These cavities are filled with water.
  • Question 6
    1 / -0
    A stele with a central core of xylem surrounded by phloem is called as 
    Solution
    The protostele is a conductive system of simple organization. It is a simple, unbranched, centrally located axial cylinder of xylem surrounded by phloem. A protostele contains no pith. It can be found in primitive vascular plants.
    Thus, the correct answer is option A.
  • Question 7
    1 / -0
    Which of the following tissue is derived from tunica?
    Solution
    According to Tunica-Corpus theory by Schmidt, the multilayered tunica (outermost) forms the epidermis.
    Thus, the correct answer is option A.
  • Question 8
    1 / -0
    Vascular bundles are arranged in a ring in the member of family ___________.
    Solution

    The study of the vascular bundles in some species of Euphorbiaceae presents the existence of bi-collateral bundles placed in the form of a ring. In Euphorbiaceae, the primary vascular tissue contains vascular bundles, commonly in one or two rings around the pith. Vascular bundles are even in size. Every vascular bundle is conjoint, collateral or bi-collateral and it is open. Phloem parenchyma is present. Bundle sheath is absent. No water-holding cavity is present.

    Thus, the correct option is C.

  • Question 9
    1 / -0
    A concentric amphivasal (leptocentric) vascular bundle is one in which ___________________.
    Solution

    Amphivasal vascular bundle: one of the phloem which is surrounded by xylem. Though collateral bundles are most common in seed plants. Many monocot species have amphivasal bundles instead or it has amphicribral ones (in which phloem surrounds xylem).

     

    Types of Vascular bundles

    A  Concentric, periphloematic

    B  Concentric, perixylematic

    C  Radial with inner xylem, with four xylem-poles which are left closed and right open.

    D  Collateral closed

    E  Collateral open

    F  Bicollateral open

     

    So, the correct answer will be centrally located phloem is surrounded by xylem.

    The correct option is A.

  • Question 10
    1 / -0
    Which of the following is not a part of epidermal tissue system?
    Solution

    • The epidermis is only one layer of cells that covers the leaves, flowers, roots, and stems of plants. It makes a boundary between the plant and the external environment. It comprises epidermal cells, stomata, and epidermal appendages (trichomes and root hairs).
    • It does not contain companion cells. Companion cell is a part of phloem.

    So, the correct answer is 'Companion cells.

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