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Anatomy of Flowering Plants Test - 57

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Anatomy of Flowering Plants Test - 57
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  • Question 1
    1 / -0
    Match the columns
    III
    aExtrafoliar nectaries1.Achras
    bSchizogenous cavities2.Tropaeolum
    cLaticiferous ducts3.Passiflora
    dHydathodes4.Eucalyptus
    5.Pinus
    Solution
    • The occurrence of extrafloral nectaries in Passifloraceae species is very common, and their presence, as well as their shape, has been widely used as a diagnostic characteristic for species or species groups within the genus Passiflora. 
    • Meristematic cells are tightly packed, and during differentiation to parenchyma, schizogenous spaces develop. Examples of this schizogenous cavities or ducts are resin ducts of Pinus. 
    • The laticiferous duct is a cavity into which latex is secreted. It is found in a considerable number of angiosperm families. Example - Achras. 
    • Characteristic hydathodes occur especially at the leaf margins of Garden Nasturtium (Tropaeolum majus). 
    So, the correct answer is 'a-3, b-5, c-1, d-2.'
  • Question 2
    1 / -0
    Compare the statements a and b
    Statement a : Sclerenchyma cells do not have plasmodesmata.
    Statement b : Cell walls of some permanent tissues are heavily lignified.
    Solution
    Plasmodesmata are narrow channels that act as intercellular cytoplasmic bridges to facilitate communication and transport of materials between plant cells and are not found in Sclerenchyma cells. Sclerenchyma fibres are long and narrow and have thick lignified cell walls. They provide mechanical strength to the plant and allow for the conduction of water. Sclereids are specialised sclerenchyma cells with thickened, highly lignified walls with pits running through the walls.
    So, the correct option is C.
  • Question 3
    1 / -0
    In Dracaena, vascular bundles are
    Solution
     Amphivasal bundle is a vascular bundle in which xylem encircles the central strand of phloem is known as amphivasal bundle, also called leptocentric bundle. Ex. Dracaena, Yucca. 
    So, the correct answer is 'Amphivasal.'
  • Question 4
    1 / -0
    Match items of column I and column II
    Column IColumn II
    aCollateral and openpCucurbita stem
    bRadialqFern
    cBicollateralrMaize Root
    dConcentricsSunflower
    tMaize stem
    Solution
    Vascular bundles are conjoint, collateral, endarch, open and arranged in a ring surrounding pith (eustele). Example - Sunflower.
    The vascular bundles are radial. Xylem and phloem occur in separate patches arranged on alternate radii, intervened by small parenchyma cells. Example - Maixe Root.
    In a bicollateral bundle, the phloem is both outside and inside the xylem, as in Solanaceae (the potato family) and Cucurbitaceae (the cucumber family). 
    Concentric: xylem and phloem elements form concentric rings in cross section. In hadrocentric (amphicribral) bundles phloem surrounds the ring of the xylem (ferns). 
    So, the correct answer is 'a-s, b-r c-p, d-q.'
  • Question 5
    1 / -0
    Choose the correct options
    (a) Thread-like cytoplasmic strands, running from one cell to other are known as plasmodesmata
    (b) Xylem and phloem constitute the vascular bundle of the stem
    (c) First formed xylem elements are described as metaxylem
    (d) Radial bundles are mainly found in leaves.
    Solution
    As a young vascular plant grows, one or more strands of primary xylem form in its stems and roots. The first xylem to develop is called 'protoxylem'. Radial vascular bundles are typically found in the roots of monocots and dicots. Typical vascular bundles are conjoint vascular bundles.
    So, the correct answer is 'a, b true c, d wrong.'
  • Question 6
    1 / -0
    Parenchymatous cells filling the space, between dermal and vascular tissue is
    Solution
    The ground tissue of plants includes all tissues that are neither dermal nor vascular. Parenchyma cells have thin primary walls and usually remain alive after they become mature. Parenchyma forms the "filler" tissue in the soft parts of plants, and is usually present in cortex, pericycle, pith, and medullary rays in primary stem and root.
    So, the correct answer is 'Ground tissue.'
  • Question 7
    1 / -0
    Collocytes which provide mechanical strength to plants occur in
    Solution
    The living mechanical tissue is collenchymas. It is found in young stems, petioles, peduncles, pedicels, veins, veinlets and leaf margins. It is absent in root systems of all plants and stem and leaves of monocots. The cells present in collenchymas are called collocytes. 
    So, the correct answer is 'Dicotyledonous stem.'
  • Question 8
    1 / -0
    A distinguishing feature of latex cells is that they are:-
    Solution
    Latex cells are single or independent units with non-anastomosing branches. They originate as minute structures and then, with the growth of the plant, elongate and branch, ramifying in all directions through the tissues of the plant, but without fusing together it forms a network.
    So the correct answer is option B.
  • Question 9
    1 / -0
    Girdling experiments cannot be successful in case of Cucurbita because it
    Solution
    Girdling experiment shows removal of ring of bark in woody plant. Hence water movement in upward direction in xylem will be affected. But cucurbita is a monocot without secondary growth (devoid of ring arrangement of vascular bundle). Thus removal of bark is not possible here.
    So, the correct option is A.
  • Question 10
    1 / -0
    According to histogen theory, the meristematic zone responsible for the development of pericycle is?
    Solution
    The cells of the shoot apical meristem divide to form three distinct layers. Dermatogen is the primary meristem that forms the outer most layer of a plant or a plant part and forms the epidermis. Periblem is a primary meristem which is located between the plerome and the dermatogen and it forms the cortex. Plerome is the primary meristem that forms the central core of a plant or plant part which gives rise to the stele (includes the vascular tissue, pith and pericycle). The part of plerome from which vascular tissues are formed is called procambium. All these layers are located at the shoot and root tip in plants as these are derived from the apical meristematic tissues according to the histogen theory given by Hanstein. So, the correct answer is B.
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