17686.In angiosperms, meiosis occurs at the time of
formation of gametes
Change over generation from sporophyte to gametophyte
formation of ovules
formation of anthers
17687.The point of attachment of the cotyledons on the tigellum is
above the hypocotyl
below the epicotyl
called first node
as stated in each of these
17688.How many pollen mother cells should undergo meiotic division to produce 64 pollen grains?
64
32
16
8
17690.Which of the following is necessary for seed formation in angiosperm?
Ovule
Pollination
Double fertilization
All the above
17691.Commonly in a mature fertilized ovule n, 2n and 3n condition is respectively found in
Antipodals, synergids and integuments
Egg, nucellus and endosperm
Antipodals, zygote and endosperm
Endosperm, nucellus and egg
17692.Karyogamy is
Fusion of zoospores
Fusion of cytoplasm
Fusion of spores
Fusion of gametic nuclei
17693.
Assertion: 7-celled, 8 nucleate and monosporic embryo sac is called Polygonum type of embryo sac.
Reason: It was discovered by Hofmeister for the first time in Polygonum.
Both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
Both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.
Assertion is true, but Reason is false.
Both Assertion and Reason are false.
17694.Anthesis is
Elongation of pollen tube is style
Emergence of anthers from corolla tube
Dehiscence of anthers
The first opening of a flower