In Ophioglossum (a fern) chromosome number in gamete ..... and in potato chromosome number in gamete is ....
$380, 12$
$630, 24$
$12,380$
$24, 630$
Genetically identical progeny is produced when an individual
$A-$ Events after the formation of zygote are called post fertilization events
$R -$ In viviparous animals a young one develops out side the mother body
Identify $X$ and $Y$ from the given diagram
$A$ -In Plant, the end of juvenile phase which makes the : beginning of the growth phase.
$R$ -In Plant, Juvenile phase is also known as vegetative phase.
What is the major disadvantage of external Fertilization ?