The $GERL$ system was proposed by:

Which of the following statements is/are correct?
$(i)$ The shape of the cells may vary with the function they perform.
$(ii)$ Human $RBC$ is about $7.0 \; \mu m$ in diameter.
$(iii)$ Cytoplasm is the main area of cellular activities.
$(iv)$ Various chemical reactions occur in cytoplasm to keep the cell in the living state.

The main difference between pinocytosis and phagocytosis is:

Except for bacteria,what do all cells contain within their cell membrane?

According to the modern colloidal theory,the cytoplasm is a polyphasic colloidal system. Who first proposed this?

Which one of the following pairs is not correctly matched?