topic 6 Flashcards
state why a coverslip is placed on top of the leaf peel?
keep leaf peel flat
explain why the leaf peel rather than the whole leaf was viewed with a microscope?
the leaf peel is thin as the leaf peel allows light to pass through it. The leaf would not allow light to shine through it
explain the effect of increasing air temperature on the rate of transpiration in a plant?
Transpiration rate is increased because water moleucles have more energy and move faster.
what is the movement of water molecules from an area with a low solute concentration to an area with a high solute concentration called?
osmosis
what structure transports water through the stem of the plant?
xylem
explain how the water loss would change if the plant only had one leaf?
transpiration would be reduced and less evaporation from the surface of the leaf would occur.
state two variables orther than temperature that she could investigate by considering orther factors that affect transpiration rate?
humidity
air speed
word equation for photosynthesis?
carbon dioxide + water -} glucose + oxygen
A scientist investigates the effect of light intensity on photosynthesis.
He places the lamp 10cm from the test tube and records the number of bubbles produced in five minutes.
He repeats the procedure with the lamp at a distance of 20cm and 30cm away from the test tube.
The scientist wants to repeat his investigation at each distance.
State three variables that should be kept constant to improve the results?
- volume of water
2.temperature
3.mass of pondweed
give one improvement the scientist could make to reduce the effect of this increase in temperature?
use a water bath
{this is for the table to find the mean}
the number of bubbles counted for test 2 was anomalous state how the scientist could deal with this anomaly?
repeat the reading to get concordant results
give a conclusion about the effect of light intensity on photosynthesis?
as light intensity decreases the rate of photosynthesis decreases.
