Biology · Oct / Nov 2022 · Paper 61 · Question 3
0610
As printed in the paper
The question as text
Plan an investigation to determine the effect of temperature on the rate of photosynthesis in an aquatic plant. [6]
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
six from:
1
independent variable
at least two different temperatures , tested / stated ; 2
dependent variable
counting bubbles / measuring volume of gas given off ; 3, 4, 5
variables kept constant - max three from ;;; set time period (for measurement)
species / type of, plant / plant tissue
size / mass of plant or number of leaves
age of plant
carbon dioxide / HCO3- concentration
light intensity / same lamp / same light bulb / AW pH of water
nutrient content of water
volume of water
6, 7 method – max two from ;;
use of gas syringe / upturned measuring cylinder or test-tube
method of controlling the temperature
fixed distance from light source
use of heat shield
equilibration time
use of oxygen probe
AVP
8
repeat investigation (at least) twice / at least two replicates ;
Make a free account to save your answers and see your weak topics and ask the AI why a wrong answer is wrong.