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Morphology of Flowering Plants Test 65

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Morphology of Flowering Plants Test 65
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  • Question 1
    1 / -0
    In racemose, flowers are arranged in
    Solution
    In racemose, flowers are arranged in Acropetal succession. Plant organs can grow according to two different schemes, namely monopodial or racemose and sympodial or cymose. In inflorescences these two different growth patterns are called as indeterminate and determinate respectively and indicate whether a terminal flower is formed and where flowering starts within the inflorescence. In Monopodial or racemose growth the terminal bud keeps growing and forming lateral flowers. A terminal flower is never formed.
    Therefore, the correct answer is option A.
  • Question 2
    1 / -0
    Axis of Inflorescence is
    Solution
    Axis of Inflorescence is the peduncle. The peduncle is a stem supporting an inflorescence. The peduncle is a stem, usually green, though some peduncles are more or less florally colored or neutral in color, having no particular pigmentation. In some species, peduncles are leafless, though others bear small leaves, or even cataphylls, at nodes, such leaves generally may be regarded as bracts.
    Therefore, the correct answer is option B.
  • Question 3
    1 / -0
    Three types of flowers occur in the inflorescence of
    Solution
    Hypanthodium is a special type of inflorescence. 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.
    Therefore, the correct answer is option B.
  • Question 4
    1 / -0
    An edible inflorescence is 
    Solution
    An edible inflorescence is  Brassica oleracea. B. oleracea is a tall biennial plant, forming a stout rosette of large leaves in the first year, the leaves being fleshier and thicker than those of other species of Brassica, adaptations to store water and nutrients in its difficult growing environment. In its second year, the stored nutrients are used to produce a flower spike. 
    Therefore, the correct answer is option D.
  • Question 5
    1 / -0
    Pedicellate flowers arising from a single point form
    Solution
    Pedicellate flowers arising from a single point form an umbel. An umbel is a type of raceme with a short axis and multiple floral pedicels of equal length that appear to arise from a common point. 
    Therefore, the correct answer is option A.
  • Question 6
    1 / -0
    In the family Caesalpinioideae, position of odd sepal is 
    Solution
    Caesalpinioideae is characterized by presence of 5 sepals, rarely four, which are mostly free and the anterior sepal is odd one. This makes them zygomorphic flowers which can be divided into two equal halves by one or more plane but not all vertical planes cut them into equal halves. 
    Therefore, the correct answer is option A.
  • Question 7
    1 / -0
    Heroin is obtained from the plant of the family
    Solution
    Heroin is obtained from the plant of the family Papaveraceae. The isoquinolinic alkaloids present in the family are well known. They are derived from berberine, tetrahydroberberine, protopine and benzophenanthridine in Papaveroideae. 
    Therefore, the correct answer is option B.
  • Question 8
    1 / -0
    Which one of the following groups of plants produces fibres of economic importance?
    Solution
    Gossypium, Hibiscus and Crotalaria plants produces fibres of economic importance. The principle economic use of Malvaceous plants is as a source of natural fibres, the family providing perhaps the world's 3 most important fibre crops. Plants of the family are also used for food, beverages, timber, in traditional medicine, and in horticulture.
    Therefore, the correct answer is option A.
  • Question 9
    1 / -0
    Quiescent centre theory for demonstrating apical organisation in root was proposed by
    Solution
    Plants roots have been studied extensively to understand its apical meristems. The studies show that the primary root meristem generates two tissues the main root axis that extends proximally towards the shoot and the root cap that goes down into the soil. The 2 dimensional longitudinal study shows that separate cell divisions take place at the leading edge of the root meristem generate a root cap which acts as a protective structure. Further studies by Clowes (1959) on the root apices and meristems shows the presence of quiescent centre at the heart of the meristem. This is a zone of relatively inactive and slow dividing cells  that functions as a reserve to help the plant roots survive stress.
    Thus, the correct answer is option C.
  • Question 10
    1 / -0
    Velamen is needed for
    Solution
    Velamen is a spongy, multiple epidermis that covers the roots of some epiphytic or semi-epiphytic plants. The velamen of an orchid is the white or gray covering of aerial roots. It is many cell layers thick and capable of absorbing atmospheric moisture and nutrients. The velamen also serves a mechanical function, protecting the vascular tissues in the root cortex, shielding the root from transpirational water loss and in many cases, adhering the plant to the substrate. The velamen arises from the root tip by division of a special tissue. The dead cells of velamen diffuse light, thus giving it a grey appearance except at the tips, where the chlorophyll become visible. Upon absorbing water, the dead cells become transparent and the whole velamen tissue then appears green.
    Thus, the correct answer is option C.
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