Calculating Cell Size/ Osmosis

Question 1

How to calculate actual size of a cell?

Answer 1

Image size/ magnification

Question 2

Calculate the length of cells in micrometers
If the actual size of a cell is 100 μm, and 10 cm in
a book, what is the magnification of the image in
the book?

Answer 2

Calculating magnification-
Image size/ actual size
First convert 10cm into millimeter by x10. Then convert it from millimeter to micro meter by x1000.
10x10=100 100x1000=
100,000 micrometer

Question 3

The plant cell contains mitochondria but the bacterial cell
does not contain mitochondria.
Use your answer to part (b)(i) and the information in the
diagram to suggest why.

Answer 3

The mitochondria is the same size as the bacterial cell

Question 4

Explain water movement in hypertonic, hypotonic, isotonic-

Answer 4

Hypertonic- concentrated solution outside of the cell, so water molecules move outside of the cell.
Hypotonic- dilute solution outside the cell. Water moves inside the cell.
Isotonic- same concentration of solute and solvent inside and outside the cell so there is no net movement of water.

Question 5

What are the effects of these solutions-

Answer 5

When too much water moves outside the cell, it shrinks
When too little water moves inside the cell, it swells and bursts.
When there is no met movement of water, the cell remains the same.