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Sexual Reproduction in Flowering Plants Test - 48

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Sexual Reproduction in Flowering Plants Test - 48
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  • Question 1
    1 / -0
    The pollination by ........ is called as zoophily.
    Solution
    Pollination carried by the animals is known as zoophily. The coloured corolla attracts insects for pollination. It has sticky pollens which attach to the insect and are transferred from the anther to the stigma of the flower. For example, Arctium.
    Pollination carried by the wind is known as anemophily. It has lighter pollens or winged pollens which are easily carried by the wind. For example, pine.
    Pollination carried by water is hydrophilly. It has lighter pollen which is easily carried by the water currents. For example, hydrilla.
  • Question 2
    1 / -0
    ............. favours autogamy
    Solution
    Homogamy favours autogamy. In this case the anther and stigmas of a bisexual flower mature simultaneously. The pollen grains reach the mature stigma either by contact, wind, gravity, rain drop or even insects. Self pollination brought about by contact is called direct autogamy and remaining agencies perform indirect autogamy.
  • Question 3
    1 / -0
    In Ficus (peepal), pollination takes place by 
    Solution
    Female fig wasps help in pollination in Ficus. They enter the Ficus via ostiole, sub-closed inflorescences to lay their own eggs and during this time pollen gets to stick to the body of wasp and thus pollination occurs.
  • Question 4
    1 / -0
    Plants with spikelet inflorescence are well adapted for ...........
    Solution
    A small spike, especially one that is part of the characteristic inflorescence of grasses and sedges. A grass spikelet consists of one or more florets (reduced flowers). Each floret contains a pistil and stamens and is enclosed by two bracts, the lemma and the palea.Anemophily or wind pollination is a form of pollination whereby pollen is distributed by wind. Almost all gymnosperms are anemophilous, as are many plants in the order Poales, including grasses, sedges and rushes. So, the correct answer is option A.
  • Question 5
    1 / -0
    A mature embryo is merely a spherical structure without the rudiments of plumule, radicle or cotyledons is seen in 
    Solution
    Orobanche is an obligates root parasite growing in the roots of plants like brinjal, potato, and mustard. They have erect unbranched roots. In the embryo of these plants the plumule, radicle or cotyledons are poorly developed. Instead, haustoria is formed for a parasitic mode of life. Thus, the correct answer is option A.
  • Question 6
    1 / -0
    The pro-ubisch bodies are converted to ubisch bodies when they become 
    coated by ..............
    Solution
    Ubisch bodies have been largely observed in plants, after they were first recorded around the aggregates of mimosoid pollen by Rosanoff. The tapetum may be secretory (glandular) or amoeboid (periplasmodial). The cells of tapetum form pro-ubisch bodies which get surrounded by sporopollenin and now called ubisch bodies. They participate in the formation of pollen exine. 
  • Question 7
    1 / -0
    The process whereby a perfect flower is pollinated by its own pollen is 
    called as .........
    Solution
    Autogamy is otherwise called as self fertilization. The term autogamy is also used for pollination and describes self pollination within the same flower, distinguished from geitonogamy, transfer of pollen to a different flower on the same flowering plant, or within a single monoecious gymnospermous plant.
  • Question 8
    1 / -0
    Germ pores can be traced in ................
    Solution
    Germ pore is the pore in the outer wall of a pollen grain through which the germ tube or pollen tube makes its exit on germination. When this fusion happens, the zygote is produced. The germ pore also releases the extra nucleus which results in the formation of triploid endosperm.
  • Question 9
    1 / -0
    The type of pollination in which pollen is transferred from anther of a flower to stigma of another flower of the same plant it is called
    Solution
    Geitonogamy - pollination of a flower by pollen from another flower on the same plant. It is a type of self pollination in flowering plants where the pollen is transferred from a flower to another flower on the same plant, and in animal pollinated systems it is accomplished by a pollinator visiting multiple flowers on the same plant. Geitonogamy is also possible within species that are wind-pollinated and may actually wind-pollinated and may actually be a quite common source of self-fertilized seeds in self compatible species. It also occurs in monoecious gymnosperms.
  • Question 10
    1 / -0
    The pollination mechanism of Calotropis is referred as ..................
    Solution
    Calotropis shows translator or clip mechanism. Pollen grains are present in pollinia. The pollinia are attracted to a rough and sticky disc called corpusculum. When the insect visits the flower, pollinia get entangled in the legs of the insect. When the insect visits another flower the pollinia are transferred.

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