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Morphology of Flowering Plants Test 29

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Morphology of Flowering Plants Test 29
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  • Question 1
    1 / -0
    Verticillaster has?
    Solution
    • Raceme in which peduncle have bisexual and pedicellate flowers arranged acropetally. It is a type of racemose inflorescence. Example: radish.
    • Verticillaster is a cluster of sessile or subsessile flowers borne on a dichasial cyme ending in monochasial cyme in the form of condensed whorl on either side of the node. It is a type of cymose inflorescence which has limited growth. Example: tulsi.

    So, the correct answer is 'condensed dichasial cymes'.
  • Question 2
    1 / -0
    Both hypanthodium and cyathium possess?
    Solution
    •  Hypanthodium has fleshy receptacle forming a hollow cavity with an apical opening called ostiole. The flowers are unisexual and develop on the inner wall of the hollow cavity. The male flowers are situated at the top near the opening, at the bottom are situated the female flowers with long styles and in between both are situated short-styled gall flowers which are sterile. It is a type of cymose inflorescence. Example: Banyan. 
    • Cyathium looks like a single flower. A cup-shaped involucre formed by bracts encloses a single female flower and a number of male flowers. It has unisexual flowers with each male flower is represented by a single stamen while a single pistil represents a female flower. It is a type of cymose inflorescence. Example: Poinsettia.

    So, the correct answer is 'Unisexual flowers'.
  • Question 3
    1 / -0
    Inflorescence consisting of unisexual sessile flowers is?
    Solution
    A. Spike in which peduncle has bisexual and sessile flowers. It is a type of racemose inflorescence. An example is Achyranthes.
    B. Spikelet is a small and special spike. Flowers are produced in the axil of fertile bracts called lemma. It is a type of racemose inflorescence. Example: wheat.
    C. Catkin is a pendulous spike in leaf axis which bears unisexual and sessile flowers. It is a type of racemose inflorescence. Example: oak.
    D. Umbel in which the main axis is reduced very much and all flowers appear to be arising from the same point. At the base of flowers, a cluster of bracts forms an involucre. It is a type of racemose inflorescence. An example is Hydrocotyle.

    So, the correct answer is 'catkin'.
  • Question 4
    1 / -0
    Glumes occur in?
    Solution
    A. Spike in which peduncle has bisexual and sessile flowers. It is a type of racemose inflorescence. 
    B. Spikelet is a small and special spike. Flowers are produced in the axil of fertile bracts called lemma. Glums may be similar in form to the lemmas. Glum is a scale at the base of each flower in spikelet. It is a type of racemose inflorescence. 
    C. Strobile is a spike with persistent overlapping bracts that resembles a cone and is the pistillate inflorescence of the top. 
    D. The spadix is a spike with the fleshy axis and having both male and female flowers. It is surrounded by large colored bracts called spathe. It is a type of racemose inflorescence. 

    So, the correct answer is 'Spikelet'.
  • Question 5
    1 / -0
    A branching system of the plant-bearing flowers is?
    Solution
    A. Deliquescence is the process by which a substance absorbs moisture from the atmosphere until it dissolves in the absorbed water and forms a solution. It occurs when the vapor pressure of the solution that is formed is less than the partial pressure of water vapor in the air.
    B. An inflorescence is the arrangement of flowers on the floral axis of the plant. Two major types are - 1. Racemose - the shoot axis continue to grow indefinitely and the flowers are borne in an acropetal succession that is, younger flowers are present towards the apex and the older flowers are present at the base. The example is a radish. 2. Cymose - the main axis terminated into a flower and has limited growth. The flowers are borne in a basipetal order. The example is teak.
    C. Placentation is the arrangement of ovules on placenta within the ovary. Ovary bears ovules on a cushion-like structure called placenta. It is of five types - marginal, axile, parietal, free central and basal.
    D. Cauliflory is a botanical term referring to plants that flower and fruit from their main stems or woody trunks rather than from new growth and shoots. This can allow trees to be pollinated or have their seeds dispersed by animals which cannot climb or fly.

    So, the correct answer is 'Inflorescence'.
  • Question 6
    1 / -0
    A scorpioid cyme having all the flowers in the same plane is _______
    Solution
    The answer is option (A) Rhipidium.
    Rhipidium is a type of scorpioid cyme, in which flowers are arranged in an alternate manner (shown in the figure).
    Lateral branches developing in one plane alternately and in the opposite direction. It makes the zigzag pattern of flower arrangement.
    Plant-like Solanum nigrum shows this kind of cyme.


  • Question 7
    1 / -0
    In Anthocephalus the inflorescence is _______.
    Solution

    The racemose inflorescence is an indeterminate inflorescence. It shows indefinite growth and bears a number of flowers.

    Cymose Head i.e. Glomerule is the Sessile or subsessile flowers. For example Anthocephalus cadamba, Albizia and Acacia.

    Racemose Head is inflorescence and is found in family Compositae, for example, Tagetes, Zinnia and Sunflower.

    Corymb is an un-branched peduncle and it bears the pedicellate flowers in an acropetal fashion.

    Thus the correct answer is the cymose head.

    The correct option is B.

  • Question 8
    1 / -0
    Spike occurs in?
    Solution
    A. The spadix is a spike with the fleshy axis and having both male and female flowers. It is a type of racemose inflorescence. The example is a banana.
    B. Catkin is a pendulous spike in leaf axis which bears unisexual flowers. It is a type of racemose inflorescence. The example is mulberry.
    C. Spikelet is a small and special spike. Flowers are produced in the axil of fertile bracts called lemma. It is a type of racemose inflorescence. The example is wheat.
    D. Spike in which peduncle has bisexual and sessile flowers. It is a type of racemose inflorescence. The example is a bottle brush. 

    So, the correct answer is 'Bottle Brush'.
  • Question 9
    1 / -0
    Name the inflorescence in which the peduncle is extremely short and bears flowers of equal pedicel length.
    Solution
    A. Corymb in which lower flowers have long pedicles than upper ones so that all the flowers are brought more or less to the same level. The main axis is short. It is a type of racemose inflorescence. The example is Iberis.
    B. Capitate in which a large number of sessile flowers grow from a suppressed rachis giving rise to a more or less globose structure. It is a type of racemose inflorescence. Example is acacia.
    C. Catkin is a pendulous spike in leaf axis which bears unisexual flowers. It is a type of racemose inflorescence. Example is oak.
    D. Umbel in which the main axis is reduced very much and all flowers appear to be arising from the same point with the same length. At the base of flowers, a cluster of bracts forms an involucre. It is a type of racemose inflorescence. Example is Hydrocotyle.

    So, the correct answer is 'Umbel'.
  • Question 10
    1 / -0
    Inflorescence is meant for ______.
    Solution

    The inflorescence is the arrangement of flowers on the stem of the plant. It provides the chance of cross-pollination and also it makes flowers more conspicuous to attract insects. When an insect grazes through the flower to collect the nectar, pollen grains stick on the body from the anther. When the insect move to each flower, then it leaves the residue of pollen on the stigma and thus it triggers the process of pollination.

    So the correct answer is ensuring cross-pollination.

    The correct option is C.

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