There must be a lower limit as to the size of a seed, for which it is
impossible to grow a plant therefrom. A strawberry seed is very small
but probably not the smallest in existence.

Elm seeds are small in relation to becoming a woody plant of a tree.
Can you have a tree come from a seed that is as small as a strawberry
seed?

Can you have a seed as small as a "big virus" or "small bacteria"?

So what I am fathoming into, is the question of the limitations of size
of plant seed in order for the entity to grow into a plant.

Somewhere in size, say in millimeters or smaller comes a lower limit
for which the seed cannot organize itself into a plant. What is this
lower limit? And the physics comes into the picture as to the
photosynthesis takes over as the energy source. So is there a Lower
Limit in size in which photosynthesis cannot take over the duties of
growing the plant.

Archimedes Plutonium
www.iw.net/~a_plutonium
whole entire Universe is just one big atom
where dots of the electron-dot-cloud are galaxies