Paper 1 questions to memorise 2

Explain why red blood cells bursts but the plant cell does not burst

Explain why red blood cells bursts but the plant cell does not burst

Water enters red blood cells by osmosis through the membrane

plants have a cell wall preventing it from bursting.

describe 2 aseptic techniques

• sterilise equipment: forceps, inoculating loop

• sterilise agar plate

one way a student could improve an investigation

repeat + calculate a mean

name 2 health conditions that might develop if a person eats a diet high in saturated fat.

don’t refer to athrtis

• TYPE 2 diabetes

• CHD

• Heart attack

• Stroke

2 products of anaerobic respiration in plant cells

• Ethanol

• Carbon dioxide

suggest why the concentration of CO2 increased between day 5 and day 10.

• no light —> no photosynthesis —> plant not taking in any co2 for photosynthesis and the snail and plant are both respiring and so releasing CO2.

water is taken in by roots, transported up the plant and lost from the leaves.

which scientific term describes this movement of water?

transpiration stream

comparing xylem and phloem, structure and function:

Structure:

• Xylem tissue made of dead cells, phloem living tissue

• Both tubular

• Both made of cells

• Xylem is hollow/ not contain cytoplasm, phloem contains cytoplasm

• Phloem has goes up and down

Function:

• xylem - transpiration, phloem - translocation

• phloem - dissolved sugars, xylem - minerals and water.

READ QUESTIONS EXTREMELY CAREFULLY

READ QUESTIONS EXTREMELY CAREFULLY