quiz 8 Flashcards
Why do guard cells shut stomata at night
to prevent water loss
What does bidirectional mean?
Moves in 2 directions
Why do root hair cells have a large extension?
To increase surface area to increase the rate of absorption from the soil
What is the role of the upper and lower epidermis of leaves?
To protect the leaf and stop water loss
Why dont root hair cells have chloroplasts?
There is no light underground, so the cells cant photosynthesise
During an investigation into the effect of light intensity on rate of water uptake by a plant, what is the independent variable?
Light intensity
Explain how decreased humidity increases the rate of transpiration
Water evaporates more slowly in more humid conditions
During an investigation into the effect of air movement on rate of water uptake by a plant,what is the dependent variable?
Rate of water uptake by measuring the movement of air bubble on a potometer
What is the function of a root hair cell?
To absorb water and minerals from the soil
During an investigation into the effect of air movement on rate of water uptake by a plant, name 2 control variables
Temperature,light intensity,humidity levels of the air and same plant species.
What is a potometer?
A piece of capillary tube to which a plant is attached that is used to measure the rate of water uptake by the plant
List 3 adaptations to the structure of xylem tissue which help it transport water and minerals
Dead cells are strengthened by lignin. No cytoplasm. No end-walls between cells, so it forms a hollow tube
During an investigation into the effect of temperature on rate of water uptake by a plant, what is the independent variable?
Temperature
What is the role of the meristem tissue in plants?
To divide into cells at the growing tips of shoots and roots
What is photosynthesis?
how plants use to make glucose
