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Anatomy of Flowering Plants Test - 48

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Anatomy of Flowering Plants Test - 48
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  • Question 1
    1 / -0
    In dicot stem the vascular bundles are.
    Solution
    Correct Option: D
    Explanation:
    • In a dicot stem, the vascular bundles are arranged in a ring around the pith.
    • They are intense at the core of the stem instead of being dispersed throughout the internal parts of the plants. 
    • In each vascular bundle, the xylem and phloem are separated by tissues called vascular cambium. 
    • In the dicot stem, the vascular bundles are conjoint, collateral and open. 
    • The vascular bundle in the monocot stem is conjoint, bicollateral and open.
    • No plant has concentric vascular bundles.
    Hence, in dicot stem the vascular bundles are conjoint, collateral and open.
  • Question 2
    1 / -0
    Radial vascular bundles occur in
    Solution

    A.Stem – collateral, conjoint, vascular bundles are present.

    B.Monocot stem – collateral, conjoint, closed vascular bundles are present.

    C.Dicot stem – collateral, conjoint, open vascular bundles are present.

    D.Root – Radial vascular bundles are present.

    So, the correct option is ‘Root’.
  • Question 3
    1 / -0
    Grafting is not possible in monocots because they
    Solution

    In monocot stem, cambium is absent in the vascular bundles. Due to this, grafting is not possible in monocot stem

    So, the correct answer is ‘Lack cambium’

  • Question 4
    1 / -0
    Vascular cambium produces
    Solution
    Correct Option: B
    Explanation:
    • In each vascular bundle, the xylem and phloem are separated by tissues called vascular cambium. 
    • It is a ring of cambium formed by the joining of intrafascicular and interfascicular cambium.
    • In the dicot stem, cambium located between the primary xylem and phloem is the called the intrafascicular cambium.
    • The medullary rays' cells join the intrafascicular cambium and turn into meristematic tissues to form the interfascicular cambium as a continuous ring of cambium.
    • The cambial ring activates and starts to cut off the new cells. both the inner and outer side.
    • The new cells formed towards the pith develop into the secondary xylem and the new cells that are formed towards the periphery develop into the secondary phloem.

    Hence, vascular cambium produces secondary xylem and secondary phloem.
  • Question 5
    1 / -0
    The bark of tree commonly comprises
    Solution

    In the old dicotyledonous stems, after secondary growth, all tissue present outside of the vascular cambium (periderm + secondary phloem) constitute bark.

    So, the correct option is ‘All tissues outside the vascular cambium’.
  • Question 6
    1 / -0
    Three radial vascular bundles are present in
    Solution

    A. Monocot stem – Many collateral, conjoint, closed, scattered vascular bundles are present.

    B. Monocot stem – more than four radial vascular bundles are present.

    C. Dicot stem – Many collateral, conjoint, open vascular bundles are present in the form of rings.

    D. Dicot root – three radial vascular bundles are present.

    So, the correct option is ‘Dicot root’.
  • Question 7
    1 / -0
    Hypodermis in monocotyledonous stem is?
    Solution

    The region present below the epidermis in monocot stem is hypodermis. It is composed with sclerenchyma. Sclerenchyma is dead mechanical tissue. It provides mechanical strength to the stem.

    So, the correct option is 'Sclerenchyma’.

  • Question 8
    1 / -0
    Vascular bundles surrounded by sclerenchymatous sheath occur in
    Solution

    In monocot stem, vascular bundles are covered outside by sclerenchymatous fibres. So they are called fibro vascular bundles.

    So, the correct option is ‘Monocot stem’. 

  • Question 9
    1 / -0
    Fascicular cambium of dicot stems is?
    Solution

    A.Apical meristem – meristem present in the apices of plant parts, found in all higher plants.

    B.Primary meristem – meristem formed from embryonic tissues or promeristem. eg:Fascicular cambium – found in dicotyledons

    C.Secondary meristem – meristem formed by the dedifferentiation of permanent tissues. eg:Inter fascicular cambium, cork cambium- found in dicotyledons

    D.Intercalary meristem – meristem present in between permanent tissues, found in monocotyledons

    So, the correct option is ‘Primary meristem’.     
  • Question 10
    1 / -0
    Two exarch vascular bundles occur in
    Solution

    A. Monocot root – many radial vascular bundles with exarch xylem are present.

    B. Dicot root – two to four radial vascular bundles with exarch xylem are present.

    C. Monocot stem – Many collateral, conjoint, closed vascular bundles with endarch xylem are present.

    D. Dicot stem – Many collateral, conjoint, open vascular bundles with endarch xylem are present.

    So, the correct option is ‘Dicot root’.
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