The question says "describe what is seen..", yes you do talk about the smoke particles, but since they appear as tiny, white specks of light you should mention that in the answer to that question since it's an observation. Likewise you would mention that the motion of these specks of light is haphazard since that is also an observation.
thnx got it...and i also read that the smoke particles are not what you see but the light reflected from them....thnx sista!