Amici (1818) studied cyclosis for the first time in
Chara
Cytoplasmic streaming or protoplasmic streaming refers to the movement of the cytoplasm within a cell.
It is caused due to the microfilaments (actin filaments) present within the cytoplasm.
Amici studied cyclosis for the first time in chara.
Chara is a genus of green algae which possesses very large cells (10 cm in length) therefore, cytoplasmic streaming is studied in these large cells.
So, the correct answer is 'Chara'.