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Anatomy of Flowering Plants Test - 18

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Anatomy of Flowering Plants Test - 18
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  • Question 1
    1 / -0
    Cells which takes part in secondary growth are named as
    Solution
    • Cambium, in plants, is a layer of actively dividing cells between xylem (wood) and phloem (bast) tissues.
    •  It is responsible for the secondary growth of stems and roots (secondary growth occurs after the first season and results in an increase in thickness).
    • Hence, Cells which takes part in secondary growth are named as Cambium.
    • So, the correct answer is 'Cambium'.
  • Question 2
    1 / -0
    For a critical study of secondary growth in plants, which one of the following pairs is suitable?
    Solution
    Secondary growth occurs due to cell division in cambia or lateral meristems resulting in thickening of stems and roots. This is the characteristic feature of dicotyledons, gymnosperms and vascular system plants. Teak and pine belong to these systems and study of secondary growth is possible in these plants.
    So, the correct answer is 'Teak and pine'
  • Question 3
    1 / -0
    The diagram below (Figure 6) shows two slides numbered 1 and 2, prepared from different parts of the same plant, numbered 3. The slides were prepared from tissues. that were undergoing cell division. On each slide, cells in various stages of cell division can be seen.

    The slide that shows meiosis is ______________, and it was prepared from the___________ of the plant: 

    Solution

    Slide 2 shows the stages of the meiosis and it can take place only in the reproductive parts of the plant. There are two phases of meiosis- meiosis, which are being observed in slide 2 as there is the formation of four cells from a single cell. The flower is the reproductive part of the plant and it undergoes meiotic division during the formation of the male and the female gametes.

    Thus, the correct option is C.

  • Question 4
    1 / -0
     Cork cells are made impervious to water and gases by the presence of
    Solution
    The thin walls of the cork cells are saturated with a waxy substance called as suberin. It makes cork almost impervious to water and air.
    So, the correct answer is option C.
  • Question 5
    1 / -0
    In a plant shoot, growth in length is due to cell division in the
    Solution
    Meristematic tissue contains cells, which divide throughout their life. Vascular cambium is present in between xylem and phloem of stem and root of vascular plants. It is source of secondary growth of xylem and phloem. Therefore, option A is incorrect. 
    Cortex is a tissue of unspecialised cells present in between epidermis and vascular tissues of stems and roots. Therefore, option C is incorrect. 
    Cork cambium is meristematic tissue, which gives rise to cork. Therefore, option D is incorrect. 
    Apical meristem is present at the buds and tips of roots. It gives rise to new cells at the tip and shoot elongates. Therefore, option B is correct.
  • Question 6
    1 / -0
    Find out the incorrect statement.
    Solution
    • Plant tissues may be meristematic or permanent. 
    • Permanent tissues may be simple, made up of a single type of cells (parenchyma, collenchyma and sclerenchyma) or complex, made up of cells of more than one type (xylem and phloem). Parenchyma cells are thin walled and have intercellular spaces. Collenchyma cells have thickenings of cellulose and pectin at the corners.
    • Meristematic tissues are made up of continuously dividing cells and permanent tissues are made of non-dividing cells. They include Apical, intercalary and lateral meristems. One important characteristic of the rapidly dividing cell is the lack of vacuoles.
    • Hence 'C' is the right option because apical and intercalary meristems are not permanent tissues.
  • Question 7
    1 / -0
    Four radial V.B. are found in : -
    Solution
    • A vascular bundle in which the primary xylem and primary phloem strands are separated from each other by non-vascular tissues and are situated on alternate radii of an axis is known as a radial vascular bundle or radial bundle. 
    • These bundles are the characteristic of roots. There is no primary cambium in this bundle and the secondary thickening occurs by the secondary cambium that originates at the time of secondary growth in dicotyledonous root only.
    • The dicot roots usually have four to six, protoxylem poles in contrast to monocot root where many poles of xylem (more than six) are present. 
    So, the correct answer is 'Dicot root'.
  • Question 8
    1 / -0
    Which of the following are simple tissues?
    Solution

    Parenchyma, collenchyma, and sclerenchyma are called simple tissues. They are made up of similar kinds of cells. Vascular tissues are complex tissues as they are heterogeneous in nature with different types of cells. The main elements are the xylem, phloem and pericycle.

    Thus, the correct option is B.

  • Question 9
    1 / -0
    Starch sheath is
    Solution
    • The endodermis of the dicot stem is the central, innermost layer of the cortex.
    • The endodermis is made up of barrel-shaped cells which do not enclose intercellular space.
    • The endodermis helps to regulate the movement of water, ions, and hormones into and out of the vascular system. It may also store starch grains as a food reserve.
    • Thus, the stem of the endodermis of the dicot stem is called starch sheath.
    So, the correct answer is option B.
  • Question 10
    1 / -0
    The layer of cells outside the phloem, meant for giving rise to the root branches is called 
    Solution
    • The layer of cells outside the phloem meant for giving rise to the root branches is called the pericycle. The pericycle is a cylinder of parenchyma or sclerenchyma cells that lies just inside the endodermis and is the outermost part of the stele of plants. 
    • Although it is composed of non-vascular parenchyma cells, it is still considered part of the vascular cylinder because it arises from the procambium as do the vascular tissues it surrounds.
    Thus, the correct answer is option E.
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