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Anatomy of Flowering Plants Test - 46

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Anatomy of Flowering Plants Test - 46
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  • Question 1
    1 / -0
    Pericycle that gives rise to lateral roots is made of _______.
    Solution

    Pericycle is the outermost part of the stele. It is made up of parenchyma tissue. Its function is a formation of lateral roots in both dicot and monocot roots.

    So, the correct option is ‘Parenchyma cells’.

  • Question 2
    1 / -0
    The outer cellular complex present on the outside of those stems and roots which have undergone secondary growth is?
    Solution

    A. Periderm - During secondary growth in both dicot stem and root, multilayered or cellular complex tissue formed in the region of cortex is called Periderm. It is formed towards the outer side of the stem or root.

    B.Epiblema – Epidermis with root hairs is called Epiblema.

    C. Phelloderm – the parenchymatous formed towards inner side of the cork cambium is called phelloderm or secondary cortex.

    D. Phellogen – a ring of meristematic tissue formed by the dedifferentiation of parenchyma present in the general cortex of dicot stem or root is called Phellogen or cork cambium.

    So, the correct option is ‘Periderm’.

  • Question 3
    1 / -0
    Pith and cortex of the stem are parts of
    Solution

    A. Dermal tissue system – Epidermis 

    B. Vascular tissue system – Xylem and phloem 

    C. Ground tissue system – General cortex, endodermis, pericycle,medulla,      medullary rays, conjunctive tissue, mesophyll 

    D. Epidermal tissue system – Epidermis

    So, the correct option is ‘Ground tissue system’.

  • Question 4
    1 / -0
    A vascular bundle having both xylem and phloem on same radii is called
    Solution
    Based on the relative position of xylem and phloem, the vascular bundles are classified into:
    1)Radial Vascular bundles: When xylem and phloem within a vascular bundle are arranged in an alternative manner (on one next to another) on different radii, the arrangement is called as radial vascular bundles. It is found in roots of dicots and monocots.
    2)Conjoint Vascular bundles: When xylem and phloem are situated on the same radii of vascular bundles, the arrangement is called as conjoint and the vascular bundle is called as conjoint vascular bundles. Such vascular bundles are common in stem and leaves of dicots and monocots.
    So, the correct answer is 'Option D- Conjoint'.
  • Question 5
    1 / -0
    Passage cells are present in
    Solution

    Endodermal cells without casparian thickenings are called passage cells. These are present opposite to the protoxylem.

    So, the correct option is ‘Endodermis’.

  • Question 6
    1 / -0
    Ground tissue having differentiated concentric layers is found in
    Solution

    A. Dicot leaf – Mesophyll is the ground tissue. It is differentiated into palisade and spongy parenchyma.

    B. Monocot leaf – Mesophyll is the ground tissue. It is not differentiated. It shows only spongy parenchyma.

    C. Cortex is the ground tissue in dicot stem. It is differentiated into hypodermis, general cortex and endodermis.

    D. Monocot stem – the region present inner to the hypodermis is ground tissue. It shows scattered arrangement of vascular bundles.

    So, the correct option is ‘Dicot stem’.

  • Question 7
    1 / -0
    Cucurbita stem is an exceptional dicot stem because it has.
    Solution

    Vascular bundles in which two phloem patches one xylem strand are present on the same radius are called Bicollateral vascualar bundles. In these bundles, phloem present towards outer side is called outer phloem and inner side is called inner phloem. Between xylem and phloem two cambium strips are present. These are found in Cucurbitaceae and Solanaceae members.

    So, the correct answer is 'Bicollateral bundles arranged in two alternate rings'.

  • Question 8
    1 / -0
    Medullary rays are extra prominent in
    Solution

    A. Monocot stem – medullary rays are absent.

    B. Dicot stems – medullary rays are present

    C. Young dicot root – medullary rays are absent.

    D. Old dicot root – medullary rays are extra prominent. It is due to the occurrence of secondary growth.

    So, the correct option is ‘Old dicot root’.

  • Question 9
    1 / -0
    In dicot stem, the pericycle is?
    Solution

    Pericycle is the outer most part of the stele. In dicot, stem pericycle is, sclerenchymatous, discontinuous, multilayered and present in the form of patches over the vascular bundles.

    So, the correct option is ‘Multilayered’.
  • Question 10
    1 / -0
    Endodermis acts as  biological check post and prevents wall to wall flow of materials because it has.
    Solution

    In the endodermal cells, lingo-suberised thickenings are present on the radial and tangential cell walls. These are called Casparian strip. Due to this, endodermis acts as biological check post and prevent wall to flow of materials.

    So, the correct option is ‘Casparian strips’.

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