Multiple Choice QuestionsCross-pollination through insect agent is called
anthropophily
malacophily
entemophily
ornithophily
Cleistogamous flowers are
bisexual flowers which remain opened
bisexual flowers which remain closed
open female flower
open male flower
Emasculation ensures cross-pollination in
staminate flower
bisexual flower
neuter flower
pistillate flower
Endosperm nucleus is
n
2n
3n
4n
C.
3n
In angiosperms, the endosperm development precedes embryo development. One sperm nucleus fertilizes the egg cell, forming a zygote, while the other sperm nucleus usually fuses with the binucleate central cell, forming a primary endosperm cell or PEC. Therefore, the cell created during double fertilization develops into the endosperm.
Identify the correct pair of statements.
I. White kernal of coconut is a free nuclear endosperm.
II. In dioecious plants, autogamy is prevented but geitonogamy occurs.
III. Cleistogamous flowers are always selfpollinated.
IV. Castor is an endospermic seed.
II, IV
II, III
I, II
III, IV
In Zostera, the marine angiosperm, the pollen grains are long ribbon-like and without exine. They have same specific gravity as that of water. How is this feature helpful in their pollination?
The pollen grains become unwettable
The pollen grains spread over large and they are lighter
The pollen grains can float below the surface of water
None of the above
Endothecium and tapetum are formed from
primary sporogenous tissue
primary parietal layer
primary parietal layer and sporogenous tissue respectively
sporogenous tissue and primary parietal layer respectively
Embryo rescue is resorted to
obtain new generation of plants quickly
to reduce chance of seedling growth
ensure growth of interspecific hybrids
induce somaclonal variations
Apomictic embryos in citrus arise from
synergids
maternal sporophytic tissue in ovule
antipodal cell
haploid cell
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