Download 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
