Which of the following statements is incorrect?

Select the correct option for the following statements:
$(i)$ The $9 + 2$ arrangement of microtubules is found in the cilia/flagella.
$(ii)$ The enzymes of the Krebs cycle are located in the outer membrane/inner membrane of the mitochondria.

Which organelle increases in quantity within cancerous cells?

Subcellular components can be separated by the help of . . . . . . .

What is the contribution of cytoplasmic $DNA$ to the total $DNA$ in a cell?

Consider the following statements and choose the correct statement.
$(i)$ The endomembrane system includes mitochondria,chloroplast and peroxisomes.
$(ii)$ Smooth endoplasmic reticulum is the major site for synthesis of lipid.
$(iii)$ Rough endoplasmic reticulum is actively involved in protein synthesis.
$(iv)$ Mitochondrial matrix possesses single circular $DNA$,a few $RNA$ and $80\; S$ ribosomes.
Which of the above statements are correct?