B6 Flashcards
(37 cards)
What is photosynthesis?
It is a reaction which happens in plants
which traps the sun’s energy to create
glucose (which is used for
respiration).
What is the word equation for
photosynthesis?
carbon dioxide + water → oxygen +
glucose
What are the reactants of
photosynthesis?
- carbon dioxide
- water
What are the products of
photosynthesis?
- glucose
- oxygen
Where does photosynthesis occur
in plants?
In the chloroplasts (in the leaf cells)
What kind of reaction is
photosynthesis?
Endothermic (because it takes IN light
energy)
In plants, what is excess glucose
stored as?
Glucose is stored as starch.
In plants, what is the glucose used
for?
Glucose is used for respiration to
release energy.
What are the small holes called
which are found on the bottom of
a leaf?
stomota
What is the function of stomata?
Gas exchange (O2 out of leaf, CO2
into
leaf)
What do you call the cells on either
side of a stoma which control its
opening and closing?
Guard cells
When are stomata usually open and
closed?
Closed - at night
Open - during the day
How do stomata open?
- Water moves into the guard cells by
osmosis.
- They become rigid (turgid) and open
the stomata.
How do stomata close?
- Water moves out of the guard cells
by osmosis.
- The guard cells become less rigid
and close the stomata.
How is a leaf adapted?
- Large surface area to absorb more
light.
- Have chloroplasts near the top of the
leaf for photosynthesis.
- Have a waxy cuticle which reduces
water loss.
What three factors affect the rate of
photosynthesis?
- Temperature
- Carbon dioxide concentration
- light intensity
What do you call a factor which
prevents the rate of photosynthesis
from increasing?
Limiting factor
As light intensity and carbon dioxide
concentration increase, what happens
to the rate of photosynthesis?
- As the factors increase, the rate
of photosynthesis increases. - Then the rate of photosynthesis
will remain the same.
As temperature increases, the rate
of photosynthesis increases in the
beginning, why?
As temperature increases, the enzymes
involved in photosynthesis will work
better so the rate will be quicker.
Give some uses of water in plants.
- Photosynthesis
- Carrying dissolved ions.
- Keeping cells rigid.
- Cooling the leaves
Give an adaptation of the roots.
They have root hair cells to absorb
water.
Give 2 adaptations of root hair
cells.
- They have an extension which
increases their surface area so
more water can be absorbed. - They have mitochondria to
release energy for active
transport.
Give two ways in which water
moves into the root hair cell.
Water moves in by:
- osmosis
- diffusion.
How does water move into the
CELL WALL of the root hair cell?
By diffusion.
