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Morphology of Flowering Plants Test 59

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Morphology of Flowering Plants Test 59
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  • Question 1
    1 / -0
    Dichasial cyme is characteristically found in
    Solution
    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. If in an inflorescence two lateral branches develop on either side of the terminal lower which again branch is known as dichasial cyme. Dianthus  species are mostly herbaceous perennials  and some are low subshrubs with oody basal stems. The leaves are opposite, simple, mostly linear and often strongly glaucous grey-green to blue-green. The flowers have five petals, with dichasial cyme.
    Therefore, the correct answer is option D.

  • Question 2
    1 / -0
    In mulberry, the inflorescence is
    Solution
    In mulberry, the inflorescence is catkin. 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. A catkin or ament is a scaly, generally drooping spike or raceme. Cymose or other complex inflorescences that are superficially similar are also generally called as thus.
    Therefore, the correct answer is option A.

  • Question 3
    1 / -0
    In Allium cepa, inflorescence is
    Solution
    In Allium cepa, inflorescence is umbellate cyme. An umbel is an inflorescence which consists of a number of short flower stalks which spread from a common point, somewhat like umbrella ribs. The arrangement can vary from being flat topped to almost spherical. Umbels can be simple or compound. The secondary umbels of compound umbels are known as umbellules. A small umbel is called as an umbellule. The arrangement of the inflorescence in umbels is referred to as umbellate or occasionally subumbellate.
    Therefore, the correct answer is option C.

  • Question 4
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    The main axis forms a cup-shaped receptacle with a narrow terminal opening. Flowers are arranged in cymose within the cup. The description refers to
    Solution
    The main axis forms a cup-shaped receptacle with a narrow terminal opening. Flowers are arranged in cymose within the cup. The description refers to hypanthodium. Here the receptacle is fleshy and forms hollow ball like structure with an apical opening.Three types of flowers develop on the inner surface of the receptacle.The female flowers are towards the base, male flowers are towards the orifice and short styled sterile female flowers are in between e.g., Ficus sp. The inflorescence is pollinated by a gall wasp (Blastophaga).
    Therefore, the correct answer is option C.

  • Question 5
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    In cyathium lnforescence, the ratio between male and female flowers is
    Solution
    Cyathium infloresence is found in genus Euphorbia of family Euphorbiaceae. 
    In this inflorescence there is a cup-shaped involucre, the involucre encloses a single female flower present in the centre, situated on a long stalk. This female flower remains surrounded by a large number of male flowers arranged centrifugally. The cyathium is surrounded by bright colored bracts. Therefore ratio of male and female flowers is Many:one. Hence correct option is B.
  • Question 6
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    Cyathium inflorescence is found in 
    Solution
    Cyathium inflorescence is found in Euphorbia pulcherrima and Poinsenia regia both. Cyathium inflorescence shows the presence of achlamydeous flowers. Achlamydeous flowers are flowers without a perianth. The cyathia are sometimes solitary, but are usually in cymes, inflorescences of the second order, in pseudumbels, on dichotomously branched stalks or in so-called as simple cymes which consist of one central and two lateral cyathia.The showy, red, modified leaves of these plants are not petals. In fact, they are not even part of the true flowers. They surround clusters of small, greenish, cup-shaped structures called as cyathia. Each cyathium is actually a flower cluster or inflorescence containing unisexual, apetalous male and female flowers. The inconspicuous male flowers occur in clusters and are reduced to a single red stamen, while the female flower consists of a single ovary (pistil) on a stalk (pedicel).
    Therefore, the correct answer is option C.
  • Question 7
    1 / -0
    Cyathium inflorescence shows the presence of 
    Solution
    Cyathium inflorescence shows the presence of achlamydeous flowers. Achlamydeous flowers are flowers without a perianth. The cyathia are sometimes solitary, but are usually in cymes, inflorescences of the second order, in pseudumbels, on dichotomously branched stalks or in so-called simple cymes which consist of one central and two lateral cyathia.The showy, red, modified leaves of these plants are not petals. In fact, they are not even part of the true flowers. They surround clusters of small, greenish, cup-shaped structures called cyathia. Each cyathium is actually a flower cluster or inflorescence containing unisexual, apetalous male and female flowers. The inconspicuous male flowers occur in clusters and are reduced to a single red stamen, while the female flower consists of a single ovary (pistil) on a stalk (pedicel).
  • Question 8
    1 / -0
    A head inflorescence is subtended by
    Solution

    Bracts that appear in a whorl subtending an inflorescence are collectively called an involucre. An involucre is a common feature beneath the inflorescences of many Apiaceae, Asteraceae, Dipsacaceae and Polygonaceae.
    Each flower in an inflorescence may have its own whorl of bracts, in this case called as an involucel. Many asteraceous plants have bracts at the base of each inflorescence. The term involucre is also used for a highly conspicuous bract or bract pair at the base of an inflorescence. In the family Betulaceae, the involucre is a leafy structure that protects the developing nuts. 
    Therefore, the correct answer is option B.

  • Question 9
    1 / -0
    What type of inflorescence is found in Ficus?
    Solution
    Hypanthodium inflorescence is found in Ficus. The fig fruit of Ficus is an enclosed inflorescence, sometimes referred to as a syconium, an urn-like structure lined on the inside with the fig's tiny flowers. The unique fig pollination system, involving tiny, highly specific wasps, known as fig wasps that enter via ostiole these sub-closed inflorescences to both
    pollinate and lay their own eggs. In hypanthodium the receptacle is fleshy and forms hollow ball like structure with an apical opening. Three types of flowers develop on the inner surface of the receptacle. The female flowers are towards the base, male flowers are towards the orifice and short styled sterile female flowers are in between.
    Therefore, the correct answer is option C.
  • Question 10
    1 / -0
    Compound bead inflorescence is found in
    Solution
    Both Echinops and Sphaeranthus members of family Asteraceae which exhibit capitulum inflorescence. A capitulum or head, the characteristic inflorescence of the sunflower family (Asteraceae). Depending on the tribe, the inflorescence may consist of ray flowers, disk flowers, or both ray and disk flowers. The ovary of each flower is situated below the attachment of the corolla and stamens, a condition referred to as epigynous or inferior. Sunflower 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 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 D.

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