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Morphology of Flowering Plants Test 58

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Morphology of Flowering Plants Test 58
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  • Question 1
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    In Triticum aestivum, the inflorescence found is 
    Solution
    In Triticum aestivum the inflorescence found is spike of spikelet. A spike is an unbranched, indeterminate inflorescence, similar to a raceme, but bearing sessile flowers.
    A spikelet can refer to a small spike, although it is primarily used to refer
    to the ultimate flower cluster unit in grasses and sedges,  in which case the stalk supporting the cluster becomes the pedicel. A true spikelet comprises one or more florets enclosed by two glumes (sterile bracts), with flowers and glumes arranged in two opposite rows along the spikelet.
    Therefore, the correct answer is option C.

  • Question 2
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    Lemmas are found in ........., in its inflorescence.
    Solution
    Lemma is a phytomorphological term used, referring to a part of the spikelet of grasses . It is the lowermost of two chaff-like bracts enclosing the grass floret. It often bears a long bristle called an awn, and may be similar in form to the glumes - chaffy bracts at the base of each spikelet. In the options above only maize has lemmas in its  inflorescence.
  • Question 3
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    In Musaceae, the type of inflorescence found is
    Solution
    In Musaceae, the type of inflorescence found is spadix. The Musaceae are a family of flowering plants, placed in the order Zingiberales. Flowering glumes are the lower and stouter of the two glumes immediately enclosing the floret. They form small dry membranous bract found in inflorescences of Gramineae and Cyperaceae. A spadix is a type of spike inflorescence having small flowers borne on a fleshy stem. Spadix are typical of the family Araceae, the arums or aroids. The spadix is typically surrounded by a leaf-like curved bract known as a spathe.
    Therefore, the correct answer is option C.

  • Question 4
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    The zigzag development of axis is an example of
    Solution
    The zigzag development of axis is an example of scorpioid cyme. In the cymose inflorescence, the main axis ends of the flower end in a flower as the peduncle stops growing. The flowers in cyme show basipetal succession. The oldest flower is the apex and the youngest flower of
    the inflorescence is at the base of the inflorescence. The flower are arranged in a centrifugal manner, and the oldest flower is at the center and the young flowers are towards the margin.
    A cyme is said to be scorpioid when the axis is curved and the flowers arise two-ranked and on alternate sides of the axis as in the forget-me-not.
    Therefore, the correct answer is option C.

  • Question 5
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    In a plant if all the lateral branches and subsequently the flowers lie in the same plane as the main axis with scorpioid monochasial cyme the inflorescence is
    Solution
    In a plant if all the lateral branches and subsequently the flowers lie in the same plane as the main axis with scorpioid monochasial cyme the inflorescence is Rhipidium. It is a fan-shaped cymose inflorescence (as in some sedges) in which the branches lie in the same plane and are suppressed alternately on each side. Rhipidium is characteristic inflorescence of Solanum nigrum.
    Therefore, the correct answer is option B.

  • Question 6
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    Anthodium inflorescence is characteristic of
    Solution
    Anthodium inflorescence is characteristic of sunflower. Sunflower belongs to Asteraceae.The genus is one of many in the Asteraceae that are known as sunflowers. It is distinguished technically by the fact that the ray flowers, when present, are sterile, and by the presence on the disk flowers of a pappus that is of two awn-like scales that are cauducous. They bear one or
    several to many wide, terminal capitula (flower heads), with bright yellow ray florets at the outside and yellow or maroon disc florets inside. Several
    ornamental cultivars have red-colored ray florets. Indeterminate simple inflorescences are generally called as racemose anthodium inflorescence. The main kind of racemose inflorescence is the raceme  and the other kind of racemose inflorescences can all be derived from this one by dilation, compression, swelling or reduction of the different axes.
    Therefore, the correct answer is option A.
  • Question 7
    1 / -0
    In Begonia and Gossypium, cymose inflorescence is found which is 
    Solution
    In Begonia and Gossypium, cymose inflorescence is found which is monochasial. An inflorescence is a group or cluster of flowers arranged on a stem that is composed of the main branch or a complicated arrangement of branches. Determinate simple inflorescences are generally called as cymose. The main kind of cymose inflorescence is the cyme. The cyme is referred as dichasial when there is only one secondary axis whereas a cyme having only one lateral flower is called as monochasial.
    Therefore, the correct answer is option B.
  • Question 8
    1 / -0
    If in an inflorescence two lateral branches develop on either side of the terminal flower which again branch is known as
    Solution
    If in an inflorescence two lateral branches develop on either side of the terminal flower which again branch is known as dichasial cyme. An inflorescence is a group or cluster of flowers arranged on a stem that is composed of a main branch or a complicated arrangement of branches. Determinate simple inflorescences are generally called as cymose. The main kind of cymose inflorescence is the cyme. The cyme is refered as dichasial when there are two secondary axis.
    Therefore, the correct answer is option D.
  • Question 9
    1 / -0
    The peduncle is compressed to a flattened or convex disc, the receptacle and the flowers (florets) are sessile this represents ....... inflorescence
    Solution
    The peduncle is compressed to a flattened or convex disc, the receptacle and the flowers (florets) are sessile this represents capitulum inflorescence. A flower head or capitulum is a very contracted raceme in which the single sessile flowers share are borne on an enlarged stem. Capitulum can be used as an exact synonym for pseudanthium and flower head, however its use is generally but not always restricted to the Asteraceae family. At least one source defines it as a small flower head. Flower head is a special type of inflorescence  in which anything from a small cluster to hundreds or sometimes thousands of flowers are grouped together to form a single flower-like structure. Pseudanthia take various forms. The individual flowers of a pseudanthium commonly are called as florets.
    Therefore, the correct answer is option C.

  • Question 10
    1 / -0
    In which one of the following the inflorescence starts as a dichasial cyme but ends in monochasial cymes?
    Solution
    The inflorescence described is verticillaster. A cymose inflorescence arranged in pairs at the nodes, in the manner of a false whorl, is called as verticillaster. A reduced raceme or cyme that grows in the axil of a bract is called as a fascicle. A verticillaster is a fascicle with the structure of a dichasium. Many verticillasters with reduced bracts can form a spicate (spike-like) inflorescence that is commonly called as a spike.
    Therefore, the correct answer is option D.

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