Juvenile and adult plants are
Morphologically different
Physiologically same
$(a)$ and $(b)$ both
None of the above
Archegoniophore and antheridiophore are part of reproductive organ of.........
Identify $X$ and $Y$ from the given diagram
In organisms, further developments of the zygote depends on.
Development of embryo from the cells of the nucellus is called
Which reproductive adaptation is characteristic of most terrestrial vertebrates but not of most aquatic vertebrates?