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Anatomy of Flowering Plants Test - 71

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Anatomy of Flowering Plants Test - 71
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  • Question 1
    1 / -0
    Which of the following statement is incorrect?
    Solution
    • Pericycle is a cylinder of parenchymal and sclerenchyma cells which lie just below the endodermis of the plants. 
    • In dicot stem, the pericycle is heterogenous made of parenchyma and sclerenchyma alternatively in irregular patches but they are not multilayered.
    • So, the correct answer is 'In a dicot stem, the pericycle is usually multilayered'.
  • Question 2
    1 / -0
    ________ lies between pericycle and epidermis
    Solution
    (A)Cortex lies between pericycle and epidermis.
    (B)Mesoderm lies between ectoderm and endoderm.
    (C)A stele is the innermost layer of cortex.
    (D)Meristem is continuously dividing  tissue.
    So, the correct answer is 'Cortex'

  • Question 3
    1 / -0
    A typical monocotyledonous root is characterized by 
    Solution
    A typical monocotyledonous root can be characterized by :-
    1) The xylem shows a polyarch condition where it forms numerous groups or bundles (usually 12 to 21).
    2) The cambium is absent in all the stages and there is no secondary thickening in such roots.
    3) The pith is large and well developed.
    So, the correct answer is 'All of the above'.
  • Question 4
    1 / -0
    Meristem is characterized by
    Solution
    Meristem is characterized by having a isodiametric shape with thin cellulosic wall, having no intercellular space, having no reserve food material and plastids and vacoules.
    So, the correct option is 'All of these'.
  • Question 5
    1 / -0
    Select the mismatched pair.
    Solution
    A. Collateral open vascular bundles- Xylem is present in the inner side and phloem to the outside and cambium ring is present in between them.
    Eg- in dicot stems as in sunflower stem.
    B. Bicollateral vascular bundles- one patch of xylem and two patches of cambium are present.
    Eg- plants belonging to the family Cucurbitaceae, Solanaceae etc
    Mazie belongs to the family Gramineae.
    C. Concentric vascular bundles- in which either the xylem or phloem surrounds each other.
    Eg- ferns.
    D. Radial vascular bundle- Xylem and phloem occupy different radii and alternate each other.
    Eg- Dicot and monocot roots (as in maize root).
    So, the correct answer is 'Bicollateral vascular bundles - Maize stem'.
  • Question 6
    1 / -0
    Lateral roots are endogenous in origin as they develop from
    Solution
    • The roots that arise horizontally from the primary roots which provide anchorage to the plants and fixes it into the soil. 
    • These roots help in the uptake of water and nutrients from the soil which is required for the growth and development of the plants.
    • They are endogenous in nature as it is developed from the cells of the pericycle which become meristematic and undergoes periclinal (parallel to the surface of a part) and anticlinal (right angles to the surface) division.
    • So, the correct answer is 'Pericycle'.
  • Question 7
    1 / -0
    Cell wall of sclerenchymatous fibres and sclereids are respectively thickened by
  • Question 8
    1 / -0
    Read the following features and choose the correct option about anatomy of dicot and monocot stem.
    (i) Collenchymatous hypodermis.
    (ii) Vascular bundles are scattered.
    (iii) Eustele.
    (iv) Ground tissue is not differentiated.
    (v) Pericycle absent

    Solution
    Dicot stem has collenchymatous hypodermis, monocots have sclerenchymatous hypodermis.  In each vascular bundle, the xylem and phloem are separated by a substance called vascular cambium. Eustele is similar to the dictyostele except that the bundles lack an endodermis and are collateral. 
    Monocots have vascular bundles throughout their ground tissue, their stems do not have a discernible pith; the parenchyma cells in monocot stems are referred to simply as ground tissue. In monocot roots, the pericycle present only produces the lateral roots. 
    So the correct option is 'Dicot stem i,ii,iii ; Monocot stem iv,v'.
  • Question 9
    1 / -0
    Select the mismatched pair.
    Solution
    A. Collateral open vascular bundles- xylem is present in the inner side and phloem to the outside and cambium ring is present in between them.
    • Eg- in dicot stems as in sunflower stem.
    B. Bicollateral vascular bundles- one patch of xylem and two patches of cambium are present.
    • Eg- plants belonging to the family Cucurbitaceae, Solanaceae etc
    • Mazie belongs to the family Gramineae.
    C. Concentric vascular bundles- in which either the xylem or phloem surrounds each other.
    • Eg- ferns.
    D. Radial vascular bundle- xylem and phloem occupy different radii and alternate each other.
    • Eg- Dicot and monocot roots (as in maize root).
    • So, the correct answer is 'Bicollateral vascular bundles - Maize stem'.
  • Question 10
    1 / -0
    Polyarch vascular bundles generally occur in 
    Solution
    • The term polyarch is used when the number of protoxylem poles are more than six.
    • The monoct roots consists of numerous xylem groups in the form of bundles, (around 12-21) this condition is called  polyarch condition.
    • So, the correct answer is, 'Monocot root'.
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