Answer key- Check up on Microscopy
1. Circle the correct answer
1. C 2. B 3. C 4. B
5. C.
2. Short Answer Questions
1. Why is safranin solution added to the onion peel slide?
- Safranin is added to stain the onion cells so that the cell structures become
more visible under the microscope.
2. What is a cell?
- A cell is the smallest unit of life that can carry out all life processes.
3. Explain why staining is important when observing cells.
- Staining is important because most cells are transparent and difficult to see
under a microscope.
4. Timeline
1665 – Robert Hooke: He observed cork and named the tiny compartments
cells
1674 –Leeuwenhoek: He observed living cells using his microscope.
1831 – Robert Brown: He discovered the nucleus.
1838–1839 – Schleiden and Schwann: They said all plants and animals are
made of cells
1855 –Virchow: He stated that all cells come from pre-existing cells.
Answer Key – Checkup on Unicellular and Multicellular
Organisms
1. Fill in the Blanks
1. Unicellular organism. 2. Multicellular organisms.
3. Tissue 4. Asexual reproduction/ binary fusion
1. Circle the correct answer
1. C 2. B 3. C 4. B
5. C.
2. Short Answer Questions
1. Why is safranin solution added to the onion peel slide?
- Safranin is added to stain the onion cells so that the cell structures become
more visible under the microscope.
2. What is a cell?
- A cell is the smallest unit of life that can carry out all life processes.
3. Explain why staining is important when observing cells.
- Staining is important because most cells are transparent and difficult to see
under a microscope.
4. Timeline
1665 – Robert Hooke: He observed cork and named the tiny compartments
cells
1674 –Leeuwenhoek: He observed living cells using his microscope.
1831 – Robert Brown: He discovered the nucleus.
1838–1839 – Schleiden and Schwann: They said all plants and animals are
made of cells
1855 –Virchow: He stated that all cells come from pre-existing cells.
Answer Key – Checkup on Unicellular and Multicellular
Organisms
1. Fill in the Blanks
1. Unicellular organism. 2. Multicellular organisms.
3. Tissue 4. Asexual reproduction/ binary fusion
