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Anatomy of Flowering Plants Test - 8

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Anatomy of Flowering Plants Test - 8
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  • Question 1
    1 / -0
    Casparian strips occurs in 
    Solution
    Casparian strip is a band of cell wall material that is deposited in the radial and transverse walls of the endodermis of roots. It is made up of suberin and sometimes lignin. It regulate water and mineral uptake by the roots. 
    Thus, the correct answer is option C.
  • Question 2
    1 / -0
    Read the different components from (a) to (d) in the list given below and tell the correct order of the components with reference to their arrangement from outer side to inner side in a woody dicot stem.
    (a) Secondary cortex
    (b) Wood
    (c) Secondary phloem
    (d) Phellem
    Solution
    Woody dicot stem have secondary growth which originates from the lateral or secondary meristems. 
    Here, the correct order of the components with reference to their arrangement from outer side to inner side in a woody dicot stem is-
    Phellem -> secondary cortex -> secondary phloem -> wood
    So, the correct answer is option D.

  • Question 3
    1 / -0
    As compared to a dicot root, a monocot root has
    Solution
    Correct Option: A
    Explanation:
    • Xylem in Dicot root is diarch to hexarch (no. of vascular bundle is 2 to 6), while in monocot polyarch (no. of vascular bundle is numerous, i.e., 8 to many) condition is present. 
    • So, monocot root has many xylem and phloem in comparison with the dicot root.
    Thus, the correct answer is option A.
  • Question 4
    1 / -0
    The vascular cambium normally gives rise to
    Solution
    Vascular cambium is a layer of meristematic tissue which is present between the primary xylem and primary phloem. It divides to form secondary xylem and phloem and helps in secondary growth and wood formation.
    So, the correct answer is option D.
  • Question 5
    1 / -0
    Age of a tree can be estimated by
    Solution
    Number of annual rings $$=$$ Number of Years.
    The annual rings of a tree are made each year when a new layer of wood is added to the trunk and branches of the tree. New wood grows from the cambium layer between the old wood and the bark. Since there is more moisture in the spring, the energy of the tree can be directed toward producing large growth cells. As the season moves into summer, the growth slows and finally stops in the fall. There are two parts to an annual ring a light portion and a darker portion. The light section is called Springwood. This part of the ring is usually widest because the tree does most of its growing then. The darker part, Summerwood, is thinner. The tree's growth slows down, hence a thinner band. This study of the rings of trees is called dendrochronology. 
  • Question 6
    1 / -0
    A major characteristic of the monocot root is the presence of 
    Solution
    Monocot root characteristics:
    1. Presence of thin walled cells in the epiblema.
    2. Absence of cuticle and stomata.
    3. Presence of unicellular root hairs.
    4. Presence of passage cells and casparian thickenings in the endodermis.
    5. Presence of parenchyma cells in the pericycle.
    6. Presence of conjuctive tissue.
    7. Presence of a distinct pith.
    8. Presence of radial vascular bundles with polyarch condition and an exarch xylem.
  • Question 7
    1 / -0
    Given figures shows

    Solution
    The figure shows structure of lenticel which facilitates gaseous exchange and transpiration. These are aerating pores in the bark of woody trees. These are surrounded by loosely arranged thin walled complementary cells enclosing inter cellular spaces for gaseous exchange.
  • Question 8
    1 / -0
    Root cambium is derived from
    Solution
    To keep pace with the expanding central stelar region during stelar growth, the pericycle with parenchyma or collenchyma cells acquire secondary meristematic property by de-differentiation and gets converted to phellogen or cork cambium. The epidermis gets ruptured and the newly formed periderm (secondary meristem) becomes the protective layer. Cork cambium is found in the vascular plants and is part of the periderm. This is a lateral meristem responsible for the secondary growth in roots and stems. 
  • Question 9
    1 / -0
    Collenchyma tissue is present in
    Solution
    Cortex of dicot stem is many layered and differentiated into hypodermis and inner cortex. Hypodermis is found below the epidermis and is constituted with angular collenchyma which is 3-5 layered. 
    Therefore, the correct answer is option A.
  • Question 10
    1 / -0
    Apical meristem is found in
    Solution
    Meristematic tissues are dividing tissues which are found in the plants which are responsible for growth of plants. Both roots and shoots have meristematic tissue at their tips called as apical meristems that are responsible for the lengthening of roots and shoots.
    Therefore, the correct answer is option C.
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