Which of the following cell organelles lacks a cell membrane?

Which of these options are not a function of Ribosomes?
$(i)$ It helps in manufacture of protein molecules
$(ii)$ It helps in manufacture of enzymes
$(iii)$ It helps in manufacture of hormones
$(iv)$ It helps in manufacture of starch molecules

Which cell organelle controls most of the activities of the cell?

Name the cell organelle which you would associate with the elimination of old and worn-out cells.

The cell organelles having their own $DNA$ and ribosomes are

Can you name the two organelles we have studied that contain their own genetic material?