ObjectiveMcq
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39 practice sets · Page 1 of 2
Wind pollinated flowers are
Small, brightly colored, producing large number of pollen grains
Large, producing abundant nectar and pollen
Small, producing large number of dry pollens
Small producing nectar and dry pollen
Small, producing large number of dry pollens
Which one is produced as a result of double fertilisation ?
Endosperm
Fruit
Megaspore
Seed
Endosperm
What is the function of filiform apparatus at the entrance into ovule ?
Brings about opening of the pollen
Guides pollen tube from synergid to egg
Helps in the entry of pollen tube into a synergid
Prevents entry of more than one pollen tube into a synergid
Helps in the entry of pollen tube into a synergid
Unisexuality of flowers prevents
both geitonogamy and xenogamy
autogamy and geitonogamy
geitonogamy but not xenogamy
autogamy but not geitonogamy
autogamy but not geitonogamy
Transfer of pollen grains from the anther to the stigma of another flower of the same plant is called as
Karyogamy
Autogamy
Xenogamy
Geitonogamy
Geitonogamy
Total number of nuclei involved in double fertilisation is
Three
Two
Five
Four
Five
Sexual reproduction of flowering plants was discovered by
Nawaschin
Camerarius
Maheshwari
Strasburger
Camerarius
Secondary nucleus present in the middle of embryo sac is
haploid
triploid
diploid
tetraploid
diploid
Pollination of Lotus is accomplished through
all the above.
insects
wind
water
insects
Pollination by snails and slugs is
malacophily
chiropterophily
entomophily
ornithophily
malacophily
Pollen grains are able to tolerate extremes of temperature and desiccation as its exine is made of
Cutin
Suberin
Callose
Sporopollenin
Sporopollenin
Passage of pollen tube through micropyle while reaching the embryo sac is
dicliny
dichogamy
mesogamy
porogamy
porogamy
Part which is grafted or the stump of another is
graft
bulbil
scion
stock
scion
Mesogamy is
Entry of pollen tube through integument
Fusion of similar male and female gametes
None of the above
Fusion of morphologically different but physiologically similar gametes
entry of pollen tube through integument
Largest cell of ovule is
Antipodal cell
Size of cells variable
Central cell
Megaspore mother cell
central cell
Intraspecific incompatibility is overcome by
Welting of anthers
Wetting of stigmas
Mixed pollination
Self pollination
mixed oollination
In plant part having two generations is
unfertilized ovule
seed
embryo germinated
pollen grain
seed
In Casuarina fertilization occurs through
apogamy
porogamy
chalazogamy
mesogamy
chalazogamy
In a type of apomixis called adventive embryony embryos develop directly from
zygote nucellus or integument
Accessory embryo sacs
in the ovule
synergids or antipodals of embryo sac
nucellus or integument
Heterozygosity is produced following
geitonogamy
autogamy
xenogamy
cleistogamy
xenogamy
