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Geitonogamy...

Geitonogamy

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The transfer of pollen grains from the anther of a flower to the stigma of another flower borne by the plant is called geitonogamy.
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Assertion : Geitonogamy is functionally cross-pollination involving pollinating agent and genetically it is similar to autogamy since the pollen grains come from the another plant. Reason : Geitonogamy is the only type of pollination which during pollination brings genetically different types of pollen grains to the stigma.

When the pollers is transferred from anther to stigma of same flower, the pollination is called autogamy. (a) Cleistogamous flowers are invariably autogamous. Explain. (b) Geitonogamy is functionally cross pollination, but genetically similar to autogamy. Identify the statement. (Kerala Board 2017)

Match the entires in column I with those of Column II and choose the correct answer {:(,"Column I",,"Column II"),("A","Cleistogamy",,"m. Insect pollination"),("B","Geitonogamy",,"n. Bud pollination"),("C","Entomophily",,"O. Pollination between flowers in the same plant"),("D","Xenogamy",,"p. Wind pollination"),(,,,"q. Cross pollination"):}

Match column I with column II and select the correct option from codes given below {:(,"Column I",,"Column II"),("A.","Cleistogamy","(i)","Insect pollination"),("B.","Geitonogamy","(ii)","Bud pollination"),("C.","Entomophily","(iii)","Pollinatin between flowers in the same plant"),("D.","Xenogamy","(iv)","Wind pollination"),(,,"(v)","Cross pollination"):}

Assertion : Although geitonogamy is functionally crosspollination involving a pollinating agent, genetically it is similar to autogamy. Reason : In geitonogamy, pollen grains from the anthers of one flower are transferred to the sigma of another flower borne on the same plant.

Choose the correct statements. 1. Autogamy takes place only in cleistogamous flowers. II. A plant with geitonogamy must possess unisexual flowers. III. Allogamy takes place only in chasmogamous flowers IV. A dioecious plant is always xenogamous

Read the following statements, state true (T) or false (F) for them and select the correct option. (a) Cleistogamous flowers prevent geitonogamy as well as xenogamy. (b) Double fertilisation occurs in all spermatophytes. (c) In pea family, the single cotyledon is called scutellum. (d) Seeds of castor and coconut retain a part of endosperm during embryo development.

(a) Describe any two devices in a flowering plant which prevent both autogamy and geitonogamy. (b) Explain the events upto double fertilization after the pollen tube enters one of the synergids in an ovule of an angiosperm .

Identify the correct pair of statements (i) White kernel of Coconut is a free nuclear endosperm (ii) In dioecious plants, autogamy is prevented but geitonogamy occurs (iii) Cleistogamous flowers are always self pollinated (iv) Castor is an endospermic seed.