Observing cells (laboratory works 2 and 3)
Answers are for parents and teachers.
1
Write the stages of plasmolysis in order.
The cell enters salt solution, water leaves, the vacuole shrinks, the protoplast separates from the wall.
2
How many grams of salt are needed for 400 mL of solution at 6 g per 100 mL?
24
3
Why are peeling the onion skin and handling salt solution shown by adults?
Tools may be sharp and the procedure must be exact; for safety.
4
Write the visible differences between plant and animal cells in 3 lines.
Plant: wall, vacuole, polygonal; animal: no wall, soft shape, no large vacuole.
5
Why does a limp piece of carrot become firm again when put in water?
Water enters cells by osmosis, the vacuoles expand and turgor is restored.