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Anatomy of Flowering Plants Test - 56

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Anatomy of Flowering Plants Test - 56
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  • Question 1
    1 / -0
    The cells forming phellogen are
    Solution
    Phellogen is the cells that contribute to the secondary growth of plant and form periderm that replaces the epidermis and make bark are parenchyma or collenchyma that gains division and contribute to the process.
    So, the correct option is 'Parenchymatous or collenchymatous'.
  • Question 2
    1 / -0
    A closed collateral bundle is one where
    Solution
    In Closed collateral bundle the cambium is absent in between xylem and phloem. Therefore stems having this type of bundle do not have normal secondary growth. Ex. Monocotyledonous stem. Usually these bundles are enclosed within bundle sheath made up of sclerenchyma and those that lack the sheath are considered as anomalous (e.g. Asparagus stem). 
    So, the correct answer is 'Collateral bundle without cambium.'
  • Question 3
    1 / -0
    A tissue is a grouping of cells similar in
    Solution
     A tissue is an ensemble of similar cells and their extracellular matrix from the same origin that together carry out a specific function. Organs are then formed by the functional grouping together of multiple tissues. The English word is derived from the French tissu, meaning something that is woven, from the verb tisser, "to weave". 
    So, the correct answer is 'Origin and function.'
  • Question 4
    1 / -0
    Vascular cambium cuts off both xylem and phloem on the inner side in ____________.
  • Question 5
    1 / -0
    Which of the following layer of cells are present just outside the vascular cambium?
    Solution
    Vascular cambium divides during secondary growth of the plant and produces secondary xylem towards the central axis of the stem and phloem add up towards the outside and is known as the cambial zone.
    So the correct option is 'Youngest secondary phloem'.
  • Question 6
    1 / -0
    Vascular bundle having cambium is
    Solution
     In open vascular bundle, cambium is present between xylem and phloem of the same vascular bundle, eg, dicot stems.Due to the presence of cambium, secondary growth in stem occurs and secondary permanent tissues (secondary xylem, secondary phloem and vascular rays) are formed. 
    So, the correct answer is 'Open.'
  • Question 7
    1 / -0
    Vascular bundle having xylem and phloem on the same radius is
    Solution
    A vascular bundle in which a strand of phloem is present external to the strand of xylem on the same radius side by side is known as collateral bundle. 
    (a) Closed collateral bundle: In this type cambium is absent in between xylem and phloem. 
    (b) Open collateral bundle: An open collateral vascular bundle has cambium called fascicular cambium between xylem and phloem. 
    So, the correct answer is 'Collateral'.
  • Question 8
    1 / -0
    Which is not true regarding sclereids?
    Solution
    Sclereids are a reduced form of sclerenchyma cells with highly thickened, lignified cellular walls that form small bundles of durable layers of tissue in most plants. The presence of numerous sclereids form the cores of apples and produce the gritty texture of guavas. They are dead cells.
    So, the correct answer is D.
  • Question 9
    1 / -0
    Separate xylem and phloem bundles are known as
    Solution
    The elements of xylem and phloem are always organized in groups called vascular bundles. The vascular tissue system develops from the pro-cambium of apical meristem. In radial vascular bundles the components are arranged separately (truly they cannot be called as bundles). Here the xylem and phloem are arranged separately in different radii. 
    So, the correct answer is 'Radial.'
  • Question 10
    1 / -0
    Given below are assertion and reason. Point out if both are true with reason being correct explanation (A), both true but reason is not correct explanation (B), assertion true but reason wrong (C), and both wrong (D),
    Assertion. Vascular cambium is considered as lateral meristem.
    Reason. It gives rise to lateral shoots.
    Solution
    Lateral meristem increases the width of plant organ so it is responsible for secondary growth. Lateral meristem includes vascular or cork cambium. Lateral meristems are both primary and secondary in origin (mostly secondary in origin). 
    So, the correct answer is 'C.'
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