Multiple Choice QuestionsPollen tablets are available in the market for
In vitro fertilisation
breeding programmes
supplementing food
supplementing food
Function of filiform apparatus is to
recognise the suitable pollen at the stigma
stimulate the division of generative cell
produce nectar
produce nectar
An organic substance that can withstand environmental extremes and cannot be degraded by any enzyme is
cuticle
sporopollenin
lignin
lignin
Even in absence of pollinating agents seed-setting is assured in
Commellina
Zostera
Salvia
Salvia
Assisted reproductive technology, IVF involves transfer of
ovum into the Fallopian tube
zygote into the Fallopian tube
zygote into the uterus
zygote into the uterus
The coconut water and the edible part of coconut are equivalent to
endosperm
endocarp
mesocarp
mesocarp
What is the function of germ pore?
Emergence of radicale
Absorption of water for seed germination
Initiation of pollen tube
Initiation of pollen tube
C.
Initiation of pollen tube
The pollen grain has two layers - outer exine and inner intine. Exine is made up of highly resistant sporopollenin while intine is pectocellulosic. At certain places exine is thin or absent called germpore or germinal furrow. After reaching on stigma the pollen grain absorbs water and nutrients from the stigmatic secretion through its germ pore. The tube or pollen grain through one of the germ pores or germinal furrows to form a pollen tube.
Which one of the following statements is wrong?
When pollen is shed at two-celled stage, double fertilization does not take place
Vegetative cell is larger than generative cell
Pollen grains in some plants remain viable for months
Pollen grains in some plants remain viable for months
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