Match sub-cellular organelles listed in Group I with their features listed in Group II.

Group I	Group II
P. Mitochondrion	1. Single membrane enclosed
Q. Chloroplast	2. Double-membrane enclosed
R. Nucleus	3. Maternal inheritance
S. Endoplasmic reticulum	4. Endosymbiotic origin

Which one of the following changes occurs in a directionally migrating eukaryotic cell?

Structured William's model
P. Can describe the changes in intracellular components of the cell during growth.
Q. Cannot describe the death phase of the cells.
R. Can describe the variation of size of cells in the different phases of growth.
S. Cannot describe the lag period of growth.
Which one of the following is correct?

Metaplasia represents

Which one of the following organelles disappears during cell division and is regenerated in the daughter cells?