Transcript B4a-d Pig
B4 a-d Pig
What is the job
of air spaces?
Allow
gases to diffuse from palisade
cell to air/air to palisade cell
List 3 adaptations
of a leaf for
efficient
photosynthesis
Broad (large surface area)
This (short diffusion distance)
Palisade cells have many chloroplasts (containing
chlorophyll)
Veins bring water/remove sugar
Stomata allow carbon dioxide in/oxygen out
Transparent epidermis
Palisade cells near top of leaf
Air spaces
Large surface area to volume ratio
What is osmosis
Diffusion of water
from a high water
concentration to a
low water
concentration
across a partially
permeable
membrane
What will happen
to a red blood cell
if you inject pure
water into your
veins?
Water will enter the cell by osmosis until it
bursts
Explain the importance of osmosis in plant
support
Water enters cells
by osmosis
Increased volume
of water inside
vacuole pushes out
against cell wall
Cells are turgid
(stiff)
Turgid cells support
plant
What is the job of
tube Z?
Transporting
sugars around the plant
What is this
device called
and what is it
for?
Potometer
Measuring
water uptake (allow
transpiration) in a plant
Why does increasing the wind speed
increase the rate of transpiration?
Water
vapour is removed from
outside the stomata
Increased the concentration gradient
between air space and air
Faster diffusion
List 2 ways desert
plants are adapted
to reduce water
loss
Extra
thick waxy cuticle
Few stomata/stomata often closed
Stomata in pits/surrounded by hairs
Small leaves (reduced surface areas)
HOW do stomata close at night?
Photosynthesis
stops
Glucose used up by respiration
Water concentration in guard cell
increases
Water leaves guard cell by osmosis
Guard cell becomes flaccid and
changes shape
Stomata closes
Why does a plant
need magnesium?
To
make chlorophyll (for
photosynthesis)
What will a plant
look like if it is
grown with very
little nitrate?
small
How do minerals
enter a root hair?
Active
transport
How is active
transport different
from diffusion?
Moves substances
from low to high
concentration
Requires energy