Plant Structure And Their Function Flashcards
What is biomass
The mass of a living material
When investigation light intensity what is the equation for rate of O2 produced
Volume produced / time taken
What can u use to measure light intensity
Light meter
What do root hairs on plants do
Take in minerals and water
Where do root hairs grow
The cells on the surface of a plants roots grow into hairs which stick out into the soil
What do root hairs give the plant
Large surface area for absorbing water and mineral ions from the soil
How are minerals absorbed
Active transport
How is water absorbed
Osmosis
What are phloem tubes
Made of columns of elongated living cells with small pores in the end walls to allow stuff to flow through
What do phloem tubes do
Transport food (sucrose) made in leaves to the rest of the plant for immediate use or storage
What is translocation
The process that phloem tubes do when they transport food(sucrose) from oeaves to the rest of the body
What do xylem tubes do
Carry water and mineral ions from roots to stem and leaves
What is transpiration
The movement of water from the root’s through the xylem and out of thr leaves
What are xylem tubes
Made of dead cells joined end to end with no end walls between them and a hole down the middle strengthened with lignin
What are stomata
Tiny pores on the surface of a plant mostly found on lower surfaces of lesves
What do stomata do
Allow for CO2 and O2 to diffuse directly in and out a leaf also allows water vapour to escaoe during transpiration
What are stomata surrounded by
Guard cells
What do guard cells do
Chnage shape to control size of stomata, when guard cells are turgid (swollen with water) the stomata are open and when the guard cells are flaccid (low on water and limp) stomata are closed
What 3 factors affect transpiration rate
Temp, light intensity, air flow
What are photosynthetic organisms
The main producers of food, therefore biomas
How do you estimate the transpiration rate and steps
Use of potometer
1) set up apparatus and record starting position of air bubble
1) start a stopwatch and record distance moved by the bubble per unit time e.g. per hour. Calculating speed of air bubble movement gives an estimate of the transpiration rate
