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Anatomy of Flowering Plants Test - 37

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Anatomy of Flowering Plants Test - 37
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  • Question 1
    1 / -0
    The type of tissue found at the apex of root or stem is called
    Solution
    Those meristems that are found at the growing tip of a root or a stem are known as apical meristems. Intercalary meristems at the nodes of stem, allow for rapid stem elongation. The lateral meristems are present on the lateral side of the stem and root of a plant.
  • Question 2
    1 / -0
    Select the incorrect pair from the following.

    A. Parenchymatous tissue have intercellular spaces.
    B. Apical and intercalary meristems are permanent.
    C. Aerenchymatous is specialized for photosynthesis.
    D. Collenchymatous tissues are irregularly thickened at the corners.
    Solution
    • Apical and intercalary meristems are not permanent as they give rise to primary tissue. 
    • Aerenchyma definition is a tissue in certain aquatic plants, consisting of thin-walled cells and large intercellular spaces adapted for internal circulation of air.
    •  Parenchymatous tissue have intercellular spaces. collenchymatous tissues are irregularly thickened at the corners. 
    Therefore, the correct answer is option C.
  • Question 3
    1 / -0
    Which of the following helps in increasing the height of plant?
    Solution
    • Apical meristem is a meristem at the tip of a plant shoot or root that produces auxin and causes the shoot or root to increase in length. Growth that originates in the apical meristem is called primary growth. 
    • Cambium is a layer of actively dividing cells between xylem (wood) and phloem (bast) tissues that is responsible for the secondary growth of stems and roots (secondary growth occurs after the first season and results in an increase in thickness). 
    • The avascular bundle is a part of the transport system in vascular plants. The transport itself happens in vascular tissue, which exists in two forms: xylem and phloem. 
    • Both these issues are present in a vascular bundle, which in addition will include supporting and protective tissues. 

    Therefore, the correct answer is option A.
  • Question 4
    1 / -0
    Cells which take part in secondary growth are named as _______
    Solution
    In the stems and roots of vascular plants, a layer of cells lying between Xylem and phloem is called cambium. The cambium retain the ability to divide, producing secondary xylem and phloem.
  • Question 5
    1 / -0
    Conjoint, closed type of vascular bundles are characteristic of
    Solution
    Vascular bundles in monocots are generally scattered. Each vascular bundle has a covering called bundle sheath formed by a single layer of sclerenchyma cells. The vascular bundle encloses both xylem and phloem. Xylem is found towards the inner surface and phloem towards the outer surface. Cambium is absent. Hence, the vascular bundles are described as conjoint, collateral and closed. 
    Dicot stems 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. 
    Vascular bundles of monocot root are radial in the arrangement. There are eight bundles each of xylem and phloem. Hence, the condition is described as polyarch. Xylem is described as exarch. 
    Dicot root vascular bundles are described as radial and tetrarch. 
    Therefore, the correct answer is option A.
  • Question 6
    1 / -0
    Potato and sugarcane give rise to new plants through
    Solution
    The portion of the stem that is underground, the modified stem which serves two functions such as storage of food and germination with help of axillary bud in suitable condition. These are called as tubers. In tubers, the stem is swollen and the nodal regions are called the eyes. Each eye has scaly leaves and axillary buds which develop into new plants when the tuber is planted e.g., potato. In sugar cane also, the nodes of stem give rise to the new plant. Thus, option C is correct.
  • Question 7
    1 / -0
    Cork is used for insulation and acts as shock absorber because
    Solution
    Cork has various properties like it is light, gave low density, it is impermeable to both liquid and gases, it's great elasticity able to retain its shape and size. It is one of the best insulators as due to its porous structure it has low conductivity to sound, heat and vibrations and has a high tolerance to heat.
    So the correct option is "It is porous".
  • Question 8
    1 / -0
    The small aerating pores seen on cork layer of woody stem are
    Solution
    The external phellem or cork is impermeable to conduction or exchange of gasses. It is not a continuous zone; a few gaps are seen in cork. In these gaps, a mass of parenchyma cells (complementary tissue) is located known as lenticels. These help in exchange of gasses, between the atmosphere and inner cortical cells. Lenticels are characteristics of the woody stem.
    So, the correct answer is option D.
  • Question 9
    1 / -0
    The length of stem increases due to________
    Solution
    • Apical meristem is a meristem at the tip of a plant shoot or root that produces auxin and causes the shoot or root to increase in length. 
    • Growth that originates in the apical meristem is called primary growth. Due to cambial activity, lateral meristem and cork cambium, the width of a plant will increase. 

    Therefore, the correct answer is option B.
  • Question 10
    1 / -0
    Which of the following plant tissues is not a simple permanent tissue ?
    Solution
    • Permanent tissues are composed of cells that have lost the power of division, having attained their definite form, size, and shape. 
    • On the basis of constituent cells, permanent tissues can be classified into three categories: simple tissue, complex tissue, special tissues. 
    • Simple tissues are homogeneous and composed of only one type of cell. On the basis of the structure of constituent cells, three types of simple tissues are parenchyma, collenchyma, sclerenchyma. 
    • While Xylem is the example of complex tissues.

       Hence, option A is the correct answer. 
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