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Anatomy of Flowering Plants Test - 19

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Anatomy of Flowering Plants Test - 19
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  • Question 1
    1 / -0
    Inter-fascicular cambium develops from the cells of
    Solution
    • Inter-fascicular cambium develops from the cells of medullary rays. 
    • The cambium present between primary xylem and primary phloem is called intra-fasicular cambium. 
    • At the time of secondary growth, cells of medullary rays in 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 2
    1 / -0
    Find the odd one out.
    Solution
    Correct Option: A
    Explanation:
    • Epiblema is a distinct epidermal cell located in rootlets of plants. 
    • It is the outer part of most of the root hairs in the cells. 
    • Muscle fibre, nerve fibre and skin are present in animals.
    • Since epiblema is the only one that is present in plants, it is the odd one out.
    Hence, the odd one out is: Epiblema.
  • Question 3
    1 / -0
    Which of the following is an epidermal cell?
    Solution
    Guard cells are modified epidermal cells, root hairs are epidermal extensions and trichome is an epidermal appendage. The epidermis cells is a single-layered group of cells that covers plants' leaves, flowers, roots and stems. It forms a boundary between the plant and the external environment. The epidermis serves several functions, it protects against water loss, regulates gas exchange, secretes metabolic compounds and absorbs water and mineral nutrients.
    Thus, the correct answer is option D.
  • Question 4
    1 / -0
    Procambium forms the
    Solution
    Procambium forms the vascular cambium. The procambium is a meristematic tissue concerned with providing the primary tissues of the vascular system. The procambium differentiates into the vascular tissues, that is xylem, phloem, and vascular cambium. The xylem and phloem are conducting and supporting vascular tissues.
    Thus, the correct answer is option B.
  • Question 5
    1 / -0
    The apical cell theory was replaced by histogen theory by
    Solution
    The apical cell theory was replaced by histogen theory by Hanstein. Henstein in 1868, divided the shoot apex into various zones. Each zone consists of a group of initial cells and called as histogen or a tissue builder. The major histogens of the stem and roots are:
    (a) The dermatogen, a meristematic external layer 
    (b) The plerome, a central core 
    (c) The periblem, the region between the two. 
    The dermatogen gives rise to the epidermis, the plerome to the primary vascular bundles and the periblem develops into the cortex.
    The dermatogen in the root cuts some small cells at the apex called as calyptrogen that give rise to root cap. These layers in some plants are not distinguished and in some have no morphological significance as the plerome sometimes forms only the pith or it may form even the cortex, even the histogen sometimes form different levels in homologous axis of the same plant.
    Thus, the correct answer is option D.
  • Question 6
    1 / -0
    The Tunica-Corpus theory was proposed by
    Solution
    Schmidt proposed the Tunica-Corpus theory which focused on the pattern of growth of tissues present at the apex. Tunica-Corpus theory was proposed by Schmidt. According to this theory, two tissue zones occur at the apex. They are the Tunica, consisting of one or more layers of cells forming the outer enveloping region and the corpus the central core.
    Therefore, the correct answer is option B.
  • Question 7
    1 / -0
    Conjoint, collateral, closed and endarch vascular bundles scattered in the ground tissue are found in
    Solution
    Conjoint, collateral, closed and endarch vascular bundles scattered in the ground tissue are found in monocot stem. In a monocotyledenous stem the vascular bundles are not arranged in a circle but are usually scattered throughout the ground tissue. There is no clearly defined pith as there is in many dicotyledonous species. The vascular bundles of monocotylenous plants do not contain a layer of meristematic tissue.  
  • Question 8
    1 / -0
    One of the following is wrong for comparison between dicot and monocot stem. In dicot stem
    Solution
    Presence of scattered, oval vascular bundles is characteristic feature of a monocot stem. Dicot stem has wedged shaped vascular bundles arranged in ring.
    Dicot stem has pith with thin walled parenchymatous cells but monocot stem lack it. 
    Both monocot and dicot stem has endarch xylem in which xylem formed first is present near the centre and is termed as protoxylem, while metaxylem is present towards the periphery. 
    Xylem in monocot is arranged as 'Y'shape with two metaxylem vessels are situated at the upper two arms and one / two protoxylem vessels at the bottom. 
    Disintegration of the lowest protoxylem creates a cavity, the protoxylem lacuna, which is absent in dicots. 
  • Question 9
    1 / -0
    Cortex and pith remain indistinguishable in
    Solution
    Cortex and pith remain indistinguishable in a monocot stem. The epidermis is a layer of cells that cover the plant body, including the stems, leaves, flowers and fruits, that protects the plant from the outside world. In old stems the epidermal layer, cortex and primary phloem become separated from the inner tissues by thicker formations of cork. But in the monocots the cortex and pith are indistinguishable.
    Therefore, the correct answer is option A.
  • Question 10
    1 / -0
    The waxy material deposited in the Casparian strip of the endodermis is
    Solution
    The waxy material deposited in the Casparian strip of the endodermis is suberin. The Casparian strip is a band of cell wall material deposited on the radial and transverse walls of the endodermis, and is chemically different from the rest of the cell wall - the cell wall being made of lignin and without suberin, whereas the Casparian strip is made of suberin and sometimes lignin. It blocks the passive flow of materials such as water and solutes into the stele of a plant. 
    Thus, the correct answer is option B.
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