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Anatomy of Flowering Plants Test - 77

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Anatomy of Flowering Plants Test - 77
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  • Question 1
    1 / -0
    Which of the following plants shows multiple epidermis and stomata deep in pits?
    Solution
    Epidermis, a complex tissue has a single cell layer made up of different types of cells, such as pavement cells, guard cells, stomata, subsidiary cells, and trichomes. 
    In xerophytes, such as Nerium, the leaf epidermis is two or three-layered with stomata in deep pits. 
    So, the correct answer is option A.
  • Question 2
    1 / -0
    The intraxylary phloem is found in
    Solution
    The intraxylary phloem is situated on the inner side of the vascular bundles. It is located on the periphery of the pith. It is present either in the form of ring or in isolated patches. It forms from the activity of provascular tissues hence, primary in character.  
    Salvia does not show presence of intraxylary phloem.
    Cucurbita stem shows bicollateral vascular bundles which produce outer and inner phloem but intraxylary phloem is absent. 
    Calotropis stem shows intraxylary phloem in isolated patches on inner side of vascular bundles. 
    Therefore, the correct answer is option C.
  • Question 3
    1 / -0
    Which of the following is not formed from procambium?
    Solution
    Inter-fascicular cambium is not formed from procambium. Inter-fascicular cambium develops from the cells of medullary rays. The cambium present between primary xylem and primary phloem is called as intra-fasicular cambium. At the time of secondary growth, cells of medullary rays, in a line with intra-fasicular cambium become meristematic and form inter-fasicular cambium. The intra-fascicular and inter-fascicular cambiums, therefore, represent a continuous ring which bisects the primary xylem and primary phloem and is known as cambium ring. 
    Thus, the correct answer is option D.
  • Question 4
    1 / -0
    Monocot roots differ from dicot roots in having 
    Solution
    Most of the features of the dicot and monocot roots are similar except the vascular bundles. In the dicot root, there are 2-6 bundles of xylem and phloem alternating whereas in monocots the number of xylem and phloem strands are more than 8. Further, the xylem vessels in dicots are polygonal and those of monocots are oval.
    Therefore, the correct answer is option C.
  • Question 5
    1 / -0
    In which of herbaceous dicot, abnormal primary vascular bundles are found in the medullary region?
    Solution
    Abnormal secondary growth in dicots do not always follow the of vascular cambium producing xylem in the inside and phloem to the outside. The species of Bougainvillea show abnormal growth in the vascular bundles, with a series of cambia rising outside the phloem. This is due to the abnormal origin of the cambium. 
    Therefore, the correct answer is option B.
  • Question 6
    1 / -0
    Conjoint and closed vascular bundles with no phloem parenchyma may be observed in
    Solution
    Conjoint and closed vascular bundles with no phloem parenchyma may be observed in monocot stem. Open vascular bundles have cambium and the possibility of further xylem and phloem. There is no cambium in closed vascular bundles.
    Thus, the correct answer is option A.
  • Question 7
    1 / -0
    Monocot stem are characterized by
    Solution
    • Anatomy of the monocot stem shows that while the vascular bundles are oval in shape, numerous, and scattered, it is by nature, conjoint, collateral, closed, and endarch without any lysigenous activity.
    • In conjoint vascular bundle xylem and phloem are situated at the same radius.
    • In collateral vascular bundle is a vascular bundle in which a phloem strand is present outside the xylem strand, on the same radius side by side.
    • In closed vascular bundle means that there is an absence of a cambium. They are not capable of forming the secondary xylem and phloem tissues.
    Therefore, the correct answer is option B.
  • Question 8
    1 / -0
    Which of the following is the correct match?

    Solution
    The given diagrams are of longitudinal view of cambium. Cambium is made of two types of cells, fusiform initials and ray initials. Fusiform initials are spindle shaped, elongated cells with tapering ends. These cells form secondary xylem and secondary phloem. In this diagram, A is showing fusiform initials. 
    Ray initials are small, isodiametric cells which are packed in regular groups. These cells form xylem and phloem rays which are arranged in horizontal manner. In this diagram, B is showing ray initials.  Cambium cells are also classified in two types on the basis of their orientation as storied and non-storied. In storied type of cambium, the short fusiform cells of all tiers lie at the same level. In the diagram, C is showing non-storied cambium. In non-storied type of cambium, the long fusiform cells of different tiers overlap each other. In the diagram, D is showing non-storied cambium. 
    Thus, the correct answer is option A.
  • Question 9
    1 / -0
    How many histogens are present in monocot root apex?
    Solution
    According to histogen theory, as proposed by Hanstein, the root and shoot apices have three distinct meristematic regions, called as histogens. These are namely dermatogens, periblem and plerome. The dermatogens makes uniseriate epidermis by anticlinal divisions, periblem forms cortex and plerome serve as progenitor of stele (pericycle, vascular bundles, pith rays or medullary rays and pith). 
    Casuarina is exception to this theory and has two histogens. Ranunculus is also exception to this theory and has one histogens. 
    Monocotyledons have four histogens, calyptrogen being the fourth one that makes root cap. Thus the correct answer is option D.
  • Question 10
    1 / -0
    Which of the following statements is or are not true?
    a. Cork cambium is otherwise called as phellogen.
    b. Cork is otherwise called as phellem.
    c. Secondary cortex is otherwise called as periderm.
    d. Cork cambium, cork and secondary cortex are collectively called as phelloderm.
    Solution
    During secondary growth in dicot roots, phellogen or cork cambium produce periderm. The cork cambium produces cork or phellem towards the periphery. Secondary cortex (secondary phloem) is produced by the cambium and while periderm is developed by phellogen. Thus, the cork cambium produces phelloderm on inside and phellem or cork on outside. 
    Thus, the correct answer is option A.
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