Multiple Choice QuestionsIn which one of the following pollination is autogamous?
Xenogamy
Chasmogamy
Cleistogamy
Cleistogamy
In angiosperms, functional megaspore develops into
embryo sac
ovule
endosperm
endosperm
Apomictic embryos in Citrus arise from
Synergids
maternal sporophytic tissue in ovule
antipodal
antipodal
Transfer of pollen grains from the anther to the stigma of another flower of the same plant is called
xenogamy
geitonogamy
karyogamy
karyogamy
Wind pollinated flowers are
small, brightly coloured, producing large number of pollen grains
small, producing large number of dry pollen grains
large, producing abundant nectar and pollen
large, producing abundant nectar and pollen
B.
small, producing large number of dry pollen grains
Pollination taking place by means of wind is known as anemophily, eg, Zea mays, Cannabis Pinus, etc. Some features of wind-pollinated flowers are -
i) Non -essential Whorls such as calyx, corolla and bracts, bracteoles are not showy.
ii) The perianth lobes are undeveloped or reduced and sometimes absent.
iii) Flowers are devoid of scent and nectars.
iv) Plants produce a very large quantity of dusty pollen grains.
v) Pollen grains are dry, very small sized, non-sticky and unwettable
These features are helpful for the individuality of pollen grains.
Synapsis occurs between
a male and female gamete
mRNA and ribosomes
spindle fibres and centromere
spindle fibres and centromere
Cotyledons and testa are edible parts of
groundnut and pomegranate
walnut and tamarind
french bean and coconut
french bean and coconut
An example of a seed with endosperm, perisperm and caruncle is
Cotton
coffee
lily
lily
Which one of the flowing pairs of plants structures has haploid number of chromosomes?
Megaspore mother cell and antipodal cells
Egg cell and antipodal cells
Nucellus and antipodal cells
Nucellus and antipodal cells
Unisexuality of flowers prevents
autogamy, but not geitonogamy
Both geitonogamy and xenogamy
geitonogamy, but not xenogamy
geitonogamy, but not xenogamy
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