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Anatomy of Flowering Plants Test - 70

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Anatomy of Flowering Plants Test - 70
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  • Question 1
    1 / -0
    Ectopholic siphonostele is found in
    Solution
    Ectophloic siphonostele is a monostele version of siphonostele. In this, a circular ring of xylem exists around the pith, and outside of xylem a ring of phloem is observed. It is found in flora section of the ecosystem.
    So, the answer is 'Osmunda and Equisetum'
  • Question 2
    1 / -0
    Which tissue of the dicot root is involved in the formation of vascular cambium?
    Solution
    In dicot root, pericycle is completely parenchymatous. During secondary growth, a part of pericycle present outer to the protoxylem, transformed into a secondary meristem called vascular cambium.
    So, the correct option is 'Portionof pericycle above the protoxylem'.
  • Question 3
    1 / -0
    The girth of the stem or root increases due to?
    Solution
    The girth of stem increases due to the increase in lateral meristematic tissues. It includes Cork cambium and vascular cambium which is located beneath the bark and vascular bundles of dicot roots and stems respectively.

    So, the correct answer is 'Cambium'.
  • Question 4
    1 / -0
    The cells which lie between xylem and phloem in dicot root are
    Solution
    In anatomy of dicot root, parenchyma present between xylem and phloem is called conjuctive tissue. It is concerned in the formation of vascular cambium and storage of food and water.
    So, the correct option is 'conjuctive tissue'.


  • Question 5
    1 / -0
    Leptocentric vascular bundle means 
    Solution
    A. Phloem completely surrounds xylem (pholem on the outer side and xylem to the inner side) is called hydrocentric.
    B. Xylem and phloem are arranged on the same radi are called collateral.
    C. Xylem completely surrounds phloem (xylem to the outer side and phloem to the inner side) is called leptocentric.
    D. Xylem and phloem on different radi are radial bundles.
    So, the correct answer is 'Xylem completely surrounds phloem'.
  • Question 6
    1 / -0
    Passage cell is always  located opposite to 
    Solution
    • Passage cells are also known as transfusion cells.
    • They are thin-walled cells which lack suberin and are found in the endodermis (is the central innermost layer of the cortex) of vascular plants (plants which consist of vascular tissues i.e, xylem and phloem).
    • They are located opposite the protoxylem strands or elements.
    • They are found in the endodermis of dicots.
    • So, the correct answer is 'Protoxylem elements'.
  • Question 7
    1 / -0
    In monocot stem

    (a) Vascular bundles are scattered.
    (b) Hypodermis is sclerenchymatous.
    (c) Endodermis is well developed.
    (d) Stele is atactostele.
    Solution
    Vascular tissue system composed of vascular bundles and they are scattered. So, the steles are called atactostele. Hypodermis is multilayered and sclerenchymatous. Endodermis is not developed.
    So, the correct option is 'a, b, d are correct'.
  • Question 8
    1 / -0
    How many of the following plants given possess open(X) and closed vascular bundles (Y) respectively?
    Brassica, Tulipa, Capsicum, Gloriosa, Nicotiana, Aloe, Cicer, Asparagus, Petunia, Colchicum, Sesbania, Zea.
    Solution
    The dicotyledons, also known as dicots, are one of the two groups into which all the flowering plants or angiosperms were formerly divided. The name refers to one of the typical characteristics of the group, namely that the seed has two embryonic leaves or cotyledons. The vascular bundle in dicots is conjoint, collateral and open type, meaning there is presence of cambium. Monocotyledons commonly referred to as monocots, are flowering plants (angiosperms) whose seeds typically contain only one embryonic leaf, or cotyledon. The vascular bundle in monocot is conjoint, collateral and closed type. Cambium is absent in monocots. Since plants like Brassica, Capsicum, Nicotiana, Cicer, Petunia, and sesbania are dicots, they posses open type of vascular bundle. Plants like Tulipia, Gloriosa, Aloe, Asparagus, Colchicum, and Zea are monocot in nature. Hence they posses closed type of vascular bundles.
    So the correct option is 'X=6,Y=6'.
  • Question 9
    1 / -0
    Parenchyma cells filling the space between dermal and vascular tissues form ________.
    Solution
    The tissues present in a plant which are dermal nor vascular are called ground tissues.
    • The ground tissues consist of the following:-
    1) Parenchyma cells- are the cells which have a thin primary wall, they are usually present in the pericycle, pith, and medullary rays of primary stem and root.
    2) Collenchyma cells - have thin primary walls with secondary thickening at corners.
    • They provide mechanical and structural support in regions of new growth in plants.
    3) Sclerenchyma cells - have a thick and lignified secondary walls and are dead in nature. 
    • They provide structural support to plants.
    So, the correct answer is 'Ground tissue'.
  • Question 10
    1 / -0
    Choose the odd feature for epidermis _____________.
    Solution
    The epidermis is the outermost, protoderm-derived layer of cells covering the stem, root, leaf, flower, fruit, and seed parts of a plant. The epidermis and its waxy cuticle provide a protective barrier against mechanical injury, water loss, and infection. Some cells are living, whereas some cells are differentiated. They are not completely dead, but they just lost the capacity to divide.

    There are few cells which are dead and only provide mechanical support. So, some cells are living while some depending on location and function may become dead. 

    So, the correct answer is 'Living'.

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