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Morphology of Flowering Plants Test 22

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Morphology of Flowering Plants Test 22
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  • Question 1
    1 / -0
    The essential organs of the flower are ..............
    Solution
    Any flower has two essential parts also called as reproductive part.
    1. Stamens or androecium are the male reproductive part and responsible for the production of pollen grains (male gamete).
    2. Carpels, pistil or gynoecium are the female reproductive part and produce ovum (female gamete).
    So the correct option is 'Androecium and Gynoecium'.
  • Question 2
    1 / -0
    The small projections present on the surface of pineapple fruit represent
    Solution
    The small projections present on the surface of pineapple fruit represent persistent bracts. Pineapple is a sorosis fruit that develops from spike or spadix or catkin where the juicy and fleshy part is formed from the axis, the bract and the perianth. Bracts (hypsophylls) are special leaves at whose axils the flowers are borne. They are not always present, and if present, the flower is called bracteate. Bracts may drop off early (deciduous) or they may be persistent. When bracts are present, they serve for the protection of flower buds in the young stage.Morphologically it can be said that a bract may be formed by the entire phyllopodium or a part of it.
     So, the correct answer is 'Persistent bracts'
  • Question 3
    1 / -0
    Which of the following cells helps in the rolling of leaves in dry weather?
    Solution
    Bulliform cells are found in the axial or upper surface of the epidermis of monocots. These are large, colourless, bubble-shaped (empty) cells found in clusters near the mid vein. In the presence of insufficient water, these cells loose water and become flaccid. In response to this condition, the leaf rolls inward (to expose the minimum part of the leaf) to minimise the water loss. So, the correct 'Bulliform cells'.
  • Question 4
    1 / -0
    The bulliform cells are also known as 
    Solution
    • The large, bubble-shaped epidermal cells that occur on the upper surface of the leaves of monocots are called bulliform cells. They are also known as motor cells. 
    • They help in the unfolding of developing leaves. 
    • These cells, by their turgor pressure changes cause rolling and unrolling of the leaves, thus regulating water loss. 
    • When bulliform cells are flaccid,  the leaves of grass close as the two sides of the blade fold up toward each other. Once adequate water is available, the leaves open again.

    Thus, the correct answer is 'Motor cell'.
  • Question 5
    1 / -0
    The palisade tissue occurs on the ............ surface of the leaf.
    Solution
    Palisade parenchyma is found immediately below the upper epidermis. It is 2 to 3 layered, with compactly arranged tubular cells, rich in parietal chloroplasts. The adaxial surface is the upper surface of a leaf. The abaxial surface is the lower surface of a leaf.
    Thus, the correct answer is 'Adaxial'.
  • Question 6
    1 / -0
    When anthers have two chambers, they are described as _______.
    Solution
    B. Dithecous
    Reason: A stamen or male reproductive organ of a flower is made up of two parts- a stalk-like filament and a knob like terminal anther. Each anther has two lobes which are attached at the back by a sterile band called connective. When both the anther lobes are present, the stamen is called dithecous(or bithecous). A dithecous anther is tetrasporangiate having four microsporangia.
  • Question 7
    1 / -0
    In Trapa, some of the roots are
    Solution
    They are green roots which are capable of photosynthesis. In Trapa (water chestnut), the green assimilatory roots are submerged like other roots. They develop from the stem nodes and are highly branched to increase photosynthesis. 
  • Question 8
    1 / -0
    Which one of the following roots stores food?
  • Question 9
    1 / -0
    Which one of the following is not a flower?
    Solution
    Sunflower (Helianthus annuus) is a member of the Asteraceae family. Its flower is not a real flower but a whole inflorescence which has a group of many small flowers. This inflorescence is known as capitulum or head inflorescence.
    So, the correct answer is option B.
  • Question 10
    1 / -0
    Stilt roots are reported from
    Solution
    Stilt roots are short but thick supporting roots which develop obliquely from the basal nodes of the stem. In screw pine or pandanus the stilt roots develop only from the lower surface of the oblique stem to provide support. Being one-sided, they have also balled prop roots. The supporting roots of pandanus bear much folded multiple root caps.
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