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Anatomy of Flowering Plants Test - 59

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Anatomy of Flowering Plants Test - 59
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  • Question 1
    1 / -0
    Conjunctive tissue is found in the mature stem of?
    Solution
    Conjunctive tissue is a type of that remains embedded within xylem and phloem of vascular bundle. It is either parenchymatous or fibrous in nature.
    It is seen in Boerhaavia diffusa , commonly called Punarnava. It is a species of flowering plant in the 4'o clock family.
    Hence the correct option is C.
  • Question 2
    1 / -0
    Plants growing at the equator are characterized by the absence of _______________.
    Solution
    The correct answer is C.
    The formation of annual rings is directly related to the seasonal differences in the activity of cambium. In equatorial  region the climatic conditions are almost uniform through out the year. So there is no difference in the activity of cambium. Hence the secondary wood is not differentiated into spring and autumn wood. So no annual rings are formed.
  • Question 3
    1 / -0
    Well developed pith is found in ______________.
    Solution
    Pith is the tissue in the stems and roots of the vascular plants. The main function is the storage of water and food. In monocots roots and duct stems, the pith is made up of parenchyma cells which are produced by vascular bundles at the centre. The pith is absent in monocot stem as a type of vascular bundles that is responsible for the formation of pith is absent. As there is no cambium ring in the dicot root, it crushes the pith region which leads to the formation of the narrow space without a ring. 
    So, the pith is found only in dicot stem and monocot root.
    So, the correct option is D.
  • Question 4
    1 / -0
    A concentric vascular bundle that has the phloem surrounding the xylem is called.
    Solution
    B.
    Amphivasal bundle is a vascular bundle in which xylem encircles the central strands of phloem. It is also known as leptocentric bundle.
  • Question 5
    1 / -0
    After two or three years of the secondary growth, the cortex is dicot root?
    Solution
    Secondary growth in dicot roots involves the formation of vascular bundles that are radial, exarch and mostly Triarch. From the outer layers of pericycle arises the phellogen which cuts the cock on the outside and secondary cortex on the inner side.
    So, the correct option is 'Is converted into cork'
  • Question 6
    1 / -0
    Which of the following can be considered as dead mechanical tissue?
    Solution
    Sclerenchyma is the dead mechanical tissue with poor water content. The cell walls are heavily thickened by lignin. It is an important permanent tissue mainly meant for the mechanical functions.
    Hence the correct option is D.
  • Question 7
    1 / -0
    Match List-I with List-II and select the correct answer.
    List-I(Meristem)List-II(structure)
    a. Apical Meristem$$1$$. Cambium
    b. Lateral Meristem$$2$$. Internodes
    c. Intercalary Meristem$$3$$. Root apex
    d. Secondary Meristem$$4$$. Cork cambium
    Solution
    • The root apical meristem, or root apex, is a small region at the tip of a root in which all cells are capable of repeated division and from which all primary root tissues are derived. 
    • The root apical meristem is protected as it passes through the soil by an outer region of living parenchyma cells called the root cap.
    • Secondary, or lateral meristems, which are found in all woody plants and in some herbaceous ones, consist of  vascular cambium and the cork cambium. 
    • They produce secondary tissues from a ring of vascular cambium in stems and roots.
    • The meristem present at the base of internodes is intercalary meristem.
    • The cork cambium also is a secondary meristem, containing meristematic cells. The cork cambium forms a major portion of the bark of woody plants. 
    • The secondary phloem also is part of the bark, but of course phloem is produced by the vascular cambium.

    Hence, the correct answer is option A. 
  • Question 8
    1 / -0
    Choose the correct answer from the alternatives given.
    The primary growth in plants results from:
    Solution
    The primary growth in plants results from promeristem. Promeristem is the early embryonic meristem from which other advanced meristems are derived. It is present in a very small area which further divides to form primary meristem.
    So, the correct answer is promeristem.
  • Question 9
    1 / -0
    Besides phellem, phellogen, root periderm comprises of
    Solution
    The periderm consists of three layers, namely phelooderm, phellogen and phellem. The phelloderm layer is present inside of cork cambium. It is composed of living parenchyma cells. The phellogen layer is present in cork cambium. It gives rise to periderm. The phellem layer is present in the cork. It is air-filled protective tissue.
    Thus, the correct answer is 'Phelloderm.'
  • Question 10
    1 / -0
    Which one of the following pairs is correctly matched? 
    Solution
    Correct Answer: (A) Meristem- Actively dividing cells.
    Explanation:
    • The actively diving type of cells is known as the meristematic cells.
    • Xylem is that type of vascular bundle through which translocation of water and minerals occurs unidirectionally.
    • Whereas through the phloem the plants transport food.
    • And the spongy parenchyma stores the starch in plants.
    Hence, the meristem consists of the actively dividing type of cells is the correctly matched option.
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