Match the following:
Column $- I$ | Column $- II$ |
$(p)$ Intine | $(v)$ Long structure |
$(q)$ Exine | $(w)$ Nutrition to pollengrain |
$(r)$ Pollentube | $(x)$ Sporopollenin |
$(s)$ Tapetum | $(y)$ Pectin, cellulose |
$(z)$ Glycogen |
$p-y, q-x, r-v, s-w$
$p-w, q-y, r-x, s-v$
$p-x, q-w, r-y, s-z$
$p-y, q-v, r-w, s-x$
Identify the structures marked $A$ to $F$ in the given diagram
In $40\;\%$ angiosperms, the pollen grains are shed at
The pollen grain represents
Pollen grains can be stored for several years in liquid nitrogen having a temperature of
After penetrating stigmatic and styler tissues, the pollen tube usually grow down towards the egg because