$A$ : Triple fusion is associated with the sexual reproduction in all spermatophytes.
$R$ : It is required to form definitive nucleus as nutritive tissue.
Assertion and Reason both are correct and also correct explanation.
Assertion and Reason both are correct but not explanation of assertion.
Assertion is correct, but Reason is incorrect.
Both Assertion and Reason are incorrect.
The total number of nuclei involved in double fertilization in angiosperms are
Assertion : Double fertilization is characteristic feature of angiospersms.
Reason : Double fertilization involves two fusions
The pollen tube usually enters the embryo sac
Fusion product of polar nuclei and male gamete is
For a gene if $A A= male plant, B B= female plant.$ Find out the genotype of endosperm and embryo