Biology Homework [Paper 1 Cells Revision] Flashcards
17/06/25 (20 cards)
How to convert from mm to nanometres.
Multiply by 1000.
State a difference in structure between xylem and phloem.
Xylem:
- A ‘dead’ cell.
- Hollow tube
- Has Lignin
Phloem:
- A ‘living’ cell
- Has sieve plates
- No lignin
State three differences between animal and plant cells.
Plant cells contain chloroplasts, permanent vacuole and cellulose cell wall. Animal cells do not contain these.
Which type of microscope has higher magnification and resolution.
Electron microscope.
State the function of the chloroplasts.
Contains chlorophyll, absorbs light to do photosynthesis.
Give one way in which the structure of the Xylem cell is adapted for its function.
Made of dead cells with no end walls and hollow tube for continous flow of water/lignin for strength and support in vessel.
What are prokaryotic cells?
Cells without a nucleus.
How to convert nanometres to mm.
Divide by 1000.
State differences in the function of xylem and phloem.
Xylem:
- Transports water in one direction from roots to leaves.
Phloem:
-Transports sugars in both directions
What are the two different types of microscopes?
Light and electron microscope.
State the function of the cell wall.
Strengthens the cell to provide support.
What is the function of phloem cells.
Transports of dissolved sugars and amino acids.
What are eukaryotic cells?
Cells with a nucleus.
Give one way in which the structure of the phloem cell is adapted for its function.
EITHER ONE OF THE FOLLOWING:
-Made of living cells supported by companion cells
-Cell walls have holes called sieve plates.
-Have less organelles to aid flow of substances.
Define ‘resolution’.
The ability distinguish between two separate points that are very close together.
Name two examples of eukaryotic cells.
Animal and plant cells.
Where is genetic material found in prokaryotes?
A single DNA loop in the cytoplasm.
State the equation that links magnification, image size and actual size.
Image size = Actual size x Magnification
State the function of the permanent vacuole.
Contains cell sap to keep plant cells rigid, provide support.
What is the function of xylem cells?
Transports tissue for water and dissolved ions.
