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Anatomy of Flowering Plants Test - 43

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Anatomy of Flowering Plants Test - 43
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  • Question 1
    1 / -0
    Which of the following help in the secondary growth?
    Solution
    D. All of the above
    Reason: Secondary growth in a plant is characterized by the increase in thickness or grith of the plant. It occurs from the the growth of lateral meristem or cambia. The formation of secondary vascular tissues from the cambium is a characteristic feature of dicotyledons and gymnosperms. There are two types of lateral meristem found in vascular plants, the cork cambium and vascular cambium.
  • Question 2
    1 / -0
    Which one of the following is not true about monocotyledonae?
    Solution
    In conjoint vascular bundles, xylem and phloem together form a bundle and are arranged in the same radius.The two sub-types are collateral and bicollateral. 
    In collateral, the xylem and phloem are present together on the same radius in such a manner that xylem lies inwards and the phloem is located outwards.
    In the dicotyledonous stem, the cambium is located between xylem and phloem, such bundles are called open and when the cambium is absent, it is called closed (seen in monocotyledonous stems). 
    Thus the correct answer is option D.
  • Question 3
    1 / -0
    Astela comprises 
    Solution
    According to concept / hypothesis of stele, proposed by Van Tiegham, the primary body of root and stem are anatomically same, i.e., consist of a central stele surrounded by cortex. 
    The stele was originated in first vascular plant (pteridophytes) and it consists of vascular tissue, pericycle and pith. Pericycle surrounds the stele on the outer side.
  • Question 4
    1 / -0
    Identify the plant parts whose transverse sections show a clear and prominent pith.
    Solution
    Pith is large and well developed in dicot stem and monocot root which is made up of thin walled colourless parenchymatous cells with lot of intercellular spaces.
    Thus, the correct answer is option D. 

  • Question 5
    1 / -0
    The loosely arranged non-chlorophyllous parenchyma cells present in lenticels are known as
    Solution
    The lenticels are the small openings in the bark of plants for gaseous exchange. The lenticel phellogen gives rise to a large mass of cells called the complementary cells. These cells are centrifugally and loosely arranged. These cells are parenchyma cells and are non-chlorophyllous. Hence they do not perform photosynthesis. Thus the correct answer is option A.
  • Question 6
    1 / -0
    Determination of age of tree by counting growth rings falls under
    Solution
    A) Dendrology is the scientific study of trees.
    B) Dendrochronology is the scientific method of the dating of tree rings.
    C) Chronology is the method of arranging dates or event in the way they occur.
    D) Chorology is the study of a geographical phenomenon occurring in a particular region.
    So the correct option is 'Dendrochronology'
  • Question 7
    1 / -0
    The vascular bundles which have two cambium and two phloem present on both sides of xylem is known as 
    Solution
    Bicollateral vascular bundles are where xylem is present in the middle of two phloem strands. It is a type of conjoint vascular bundle.
    Example - Cucurbita stem.
    So, the correct answer is 'Bicollateral'
  • Question 8
    1 / -0
    Cork cambium represents ________
    Solution
    A. Secondary meristem
    Reason: The secondary meristems are usually known lateral meristem. They give rise to secondary tissues which constitute secondary growth. The common examples are vascular cambium of the root (derived from conjunctive parenchyma), interfascicular vascular cambium, cork cambium, wound cambium and accessory cambia.
  • Question 9
    1 / -0
    As compound to other parts of root apical meristem, DNA content of quiescent centre is
    Solution
    • The quiescent centre is that part of the root-promeristems that contains the initials of epidermis, cortex and stele.
    • These cells divide less frequently as they are inactive and are present at the pole of cortex and stele.
    • The cells with QC have small dictyosomes, nuclei and nucleoli with little cytoplasm.
    • These cells also have little endoplasmic reticulum, mitochondria and contain low concentrations of RNA, DNA and protein than the other cells of the root apex.
    • So, the correct answer is 'Low'.
  • Question 10
    1 / -0
    Periblem forms
    Solution
    • The shoot apical meristem (SAM) of a plant form three distinct meristematic zones called the Histogens.
    • These histogens are present at the growing shoot tip or root tip.
    • These tips consist of three histogens based on the type of cells they form.
    • Each of these histogens gives rise to tissues which are different from one another- dermatogen, periblem, plerome (principle tissues)
    1) The dermatogen or the outer layer gives rise to the epidermis.
    2) The periblem or middle layer gives rise to the cortex and the endodermis (compact living cells with hydrophobic substances) which is the innermost layer of the cortex.
    3)The plerome or the inner layer gives rise to vascular tissues.
    So, the correct answer is 'Both A and B'.
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