9Bp.05 Function of the Stoma
Monday, 17 March 2025
Lesson objective(s):
- I will be able to name the part of the stoma that opens &
closes
- I will be able to name the function of the stoma
- I will be able to explain why the leaf is designed to function
Key word(s):
Diffusion
distance
guard cells
stoma
Starter:
1) Name the mineral ions that are absorbed through the root hair cells (5
marks)
Nitrate, magnesium, nitrogen, phosphorus, potassium
2) Name the process that allows gases to move in and out of the leaves
Diffusion
Top side of the leaf
Bottom side of the leaf
Stoma (single) or Stomata (Plural)
Stoma (single)
Stomata (Many)
Questions about the Stoma (single) or Stomata (Plural)
1a) Which part of the day does the stoma (single) / stomata (plural) stay
open? (1)
Sunlight hours
1b) Name the reason that this happens in 1a)? (1)
Photosynthesis is carried out
1c) name the gas that is a reactant used in 1b)? Provide the word name (1)
and chemical formula (1).
Carbon dioxide, CO2
1d) Name the gases that move out from the leaf. Provide the word name
and chemical formula. (4)
Oxygen O2 & water vapour H2O
2) Name the process that allows the gases to move in & out of the leaf (1)
Diffusion
3) Where is the stoma/stomata located on a plant, BE ACCURATE WITH
YOUR DESCRIPTION (1)
On the bottom side of the leaf
Why is the leaf shaped like this? (6 marks)
a) Large surface area of the leaf (1)
to absorb the sunlight energy for
photosynthesis (1)
b) Thin leaf (1) for a short diffusion
distance (1)
c) The palisade cells are towards the
top surface of the leaf (1) so that
it can absorb sunlight energy (1)
Roots
Vein also known as the
Vascular Bundle
It is made up of the 1) Xylem
& 2) Phloem
–– xylem for transport and support
Transpiration: Movement of water
in one direction:
Root hair cells → xylem → leaf →
stoma
1) The mineral ions is dissolved in
the water.
2) The water leaves the plant.
3) The mineral ions remain in the
plant.
–– phloem for transport
Transports glucose and amino acids
around the plant.
Two-way system
The water and glucose moves up &
down the plant.
Xylem
Transpiration
Phloem
1) What are the differences in function (how it works) between the
Xylem & Phloem?
water & ________
mineral_____(1)
ions
up the plant
Xylem allows movement of _______
___
(1)
Water _______
glucose & _______
amino _______
acids
The Phloem allows movement of _______,
Up & ________the
down
(1) ___
plant (1)
9Bp.05 The use of Mineral Ions
Monday, 17 March 2025
Lesson objective(s):
- I will be able to name the mineral ions for a healthy plant
- I will be able to name the function of the mineral ions
- I will be able to state what happens when plants are
deficient in mineral ions.
Key word(s):
Diffusion
distance
guard cells
stoma
Starter:
1) Where can plants get its source of the mineral ions (before the soil)
FERTILISER: N Nitrogen, P Phosphorus, K Potassium, nitrate ions,
Magnesium ions
Artificial
Natural
(manufactured)
(Animal poop)
Magnesium ions → Chlorophyll
Magnesium ions absorbed through the roots by diffusion
Explain the effects of nitrate ion and magnesium ion deficiency on plant
growth
1) How do mineral ions enter the plant (3 marks)
Mineral ions are dissolved in water (1 mark)
Absorbed through the root hair cells (1 mark)
By Osmosis (1)
2) Name the source where mineral ions are obtained?
Fertiliser
3) Name the mineral ion that gives the chlorophyll its green pigment?
Magnesium
4) When using fertilizer what does it do to the crop output?
The Yield increases