"tktemur" wrote in message
oups.com...

if a cell contains choloroplast it is a plant cell.

Perhaps, if you were to choose to make that be your definition of
"plant" or "plant cell". However, that's not the definition being
used in biology. The preferred definition of "plant" will likely
be based on inferred common ancestry, not any single defining
characteristic.

we cant say anything about it.....

Sure we can. Lots of organisms that are not considered
"true plants" do nevertheless have chloroplasts in their cells.
In other words, you're somewhat mistaken on this point.

There undoubtedly have been multiple independent origins of
"cells containing chloroplasts"; they're not a single
evolutionary group. Red algae, diatoms, dinoflagellates, brown
algae, euglenids, etc. all are understood to have acquired
chloroplasts independently of the green algae and the familiar
green land plants.

cheers