The main controlling centre of the cell is ___________

Structure found only in animal cells and which regulates cell division is _________________

Function of ribosomes is __________________________

Proteins are produced in the __________________

__________ controls all the activities of cell.

Assertion (A) : Eukaryotic cells have more DNA than prokaryotic cells.

Reason (R) : Eukaryotic are genetically more complex than prokaryotes.

Name of the human blood cell that can change its shape.

From the features given below, identify the cell organelle:

1. Smooth, flattened sac like structure.
2. Stacked together in parallel rows.
3. Present in all eukaryotic cells.
4. Absernt in prokaryotic cells.

Organelles were not clear evident in cells until the invention of the _______ microsope

Assertion (A) : The true nucleus is generally absent in prokaryotes.

Reason (R) : An undifferentiated, unorganised fibrillar nucleus is observed in prokaryotic cells.