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Anatomy of Flowering Plants Test - 39

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Anatomy of Flowering Plants Test - 39
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  • Question 1
    1 / -0
    If a stem is girdled
    Solution
    Girdling or ring barking is the process, which involves the complete removal of a strip of bark that consists of cork cambium, phloem, cambium from the circumference of a branch or trunk of any woody plants. If the stem is girdled, it results in the death of the root of the plant as the leaves cannot  transport sucrose to the roots and these can no longer produce ATP and transport nutrients.
    Therefore, the correct answer is option A.
  • Question 2
    1 / -0
    Cork cambium results in the formation of cork, which becomes impermeable to water due to the accumulation of
    Solution

    Cork cambium produces cork cells, which form exterior to the cork cambium. In this, the cells are arranged in regular radial rows one above the other. As cork cells mature, they secrete suberin (a waxy substance) in their cell walls and which makes them impermeable then die. Cork cells function as a barrier to protect the stem from physical damage and from pathogens. 
  • Question 3
    1 / -0
    Cork cambium is a
    Solution
    Correct Option: A
    Explanation:

    • Vascular cambium and cork cambium and called secondary meristems because they produce secondary tissues and increase the thickness of the plant body.
    • This process is called secondary growth, seen in dicotyledons and gymnosperms.
    • Vascular cambium and cork cambium are two lateral meristems.
  • Question 4
    1 / -0
    Ectophloic siphonostele is found in 
    Solution
    • Siphonostele is a stele consisting of a core of pith surrounded by concentric layers of xylem and phloem.
    • Ectophloic siphonostele a monostele type of siphonostele in which a ring of xylem occurs around the pith, and a ring of phloem outside the xylem. For example, Osmunda and Equisetum'.
    • Hence Ectophloic siphonostele is found in Osmunda and Equisetum.
    • So, the correct answer is 'Osmunda and Equisetum'.
  • Question 5
    1 / -0
    Exarch and polyarch condition is found in
    Solution
    Vascular bundles in monocot root are radial in arrangement. There are eight bundles each of xylem and phloem. Hence, the condition is described as polyarch. Xylem is described as exarch
    In monocot stem, xylem is described as endarch and presence of only two protoxylem and two metaxylem vessels in each bundle. So, it is not polyarch. 
    In dicot root, vascular bundles are described as radial and tetrarch. There are four bundles each of xylem and phloem occurring alternately. Xylem is described as exarch
    Dicot stem vascular bundles are eight in number, arranged in form of a broken ring. The vascular bundles are conjoint, collateral and open. Xylem is on the inner surface and phloem on the outer surface. Xylem is described as endarch
    So, the correct answer is 'Monocot root'
  • Question 6
    1 / -0
    Which one of the following is not true about monocotyledons?
    Solution
    Characteristic features of monocots include the following -
    1. Embryo with single cotyledon.
    2. Leaves oblong or linear often sheathed at the base. 
    3. Parallel venation, trimerous flowers
    4. Presence of adventitious roots that are fibrous. 
    5. Vascular bundles numerous and scattered in ground parenchyma
    6. Cortex and stele not differentiated.
  • Question 7
    1 / -0
    Vascular bundles in root, stem, leaves are
    Solution
    Vascular bundles in root,stem,leaf stalks and Leaf veins are all continuous and form an unbroken system of tubes.collectively, they form the transport system throughout the entire plant.
  • Question 8
    1 / -0
    The bark of woody plant is dead but the inner layers inside the bark are living. How do these inner layers get oxygen and release carbon dioxide?
    Solution
    Lenticels are portions of the periderm(bark) withnumerous intercellular space. Its purpose is to allow gaseous exchange through the compactly arranged cork cells of the bark.

  • Question 9
    1 / -0
    The stele present in Equisetum is
    Solution
    1. Haplostele consist of smooth ore of xylem which is surrounded by a phloem ring.ex-Seleginella
    2. Actinostele consist of star shape xylem core with many radiating arms.ex-Lycopodium
    3. Plectostele consist of xylem core broken into a number of parallel plates.ex-Lycopodium clavatum
    4. Siphonostele is a protostele with central pith and considered to be the most advance stele.ex-Equisetum.
    So the correct option is "Siphonostele".
  • Question 10
    1 / -0
    Phloem is a type of ________
    Solution
    Phloem Is a vascular tissue in land plants primarily responsible for the distribution of sugars and nutrients manufactured in the shoot.
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