plant structures and their function Flashcards
phototropism
grows towards light
geotropism
grows towards gravity
ethene
ripe
gibberellins
growth
auxins
growth towards lights
what does the phloem do and how
transports ions through sieve elements
which direction does the phloem go
downwards from leaves to roots
what does the xylem do
carries water
which direction does the xylem travel in
upwards direction from roots to leaves
if transpiration is effected by light what happens
more transpiration as their is more photosynthesis
if transpiration is effected by high temp what happens
more transpiration as rate of reaction is faster
if transpiration is effected by high winds what happens
more transpiration as wind is moving things creating diffusion
if transpiration is effected by high humidity what happens
lower transpiration as water struggles to leave
what are stomata protected by
guard cells
what is photosynthesis equation
carbon dioxide + water -> glucose + oxygen
photosynthesis symbol equ + balance
CO2 + H2O -> O2 + C6H12O6
balanced
6CO2 + 6H2O -> 2O2 + C6H12O6
what type of reaction is photosynthesis
endothermic
what is a limiting factor
A factor which is not at an optimum level to enable maximum rate
of photosynthesis e.g. temperature
how is CO2 a limiting factor
rate increases with it however then other factors limit it
e.g. water, light, temp all need to be increased then
how is temp a limiting factor
rate increases with temp, it hits its optimum temp then enzymes active sites denature so no more photosynthesis can happen
how is light intensity a limiting factor (2)
depends on day light
rate increases with light intensity, hits a point where other factors have to be increased
e.g. CO2, water or temp
where is glucose stored
starch ( potatoes)
what is the light intensity equ
1/d2 (distance squared)
structure of the stomata
A stoma is a pore, found in the leaf and stem epidermis
function of the stomata
used for gas exchange
translocation
the movement of materials from leaves to other tissues throughout the plant.
what is transported by translocation
sucrose
how is sucrose transported by translocation
around the plant in phloem vessels
endothermic reaction + e.g.
chemical reactions in which the reactants absorb heat energy from the surroundings to form products.
e.g. photosynthesis
exothermic reaction + e.g.
chemical reactions which release energy from the chemicals into the surroundings.
e.g. respiration
description of core practical
This experiment uses microscopic green algae trapped inside balls of jelly to investigate
photosynthesis.
The “algal balls” are placed in a hydrogen carbonate indicator solution.
As the algae photosynthesise they remove CO2 from the solution changing the pH.
This changes the colour of the indicator.
