1.2 More about photosynthesis

• Biology
• Secondary Education

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Unit 1 - Photosynthesis and the Carbon Cycle

More about Photosynthesis

10 November 2025

How do you feel today?

😒🙁😐🙂😃

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• I will know which part of the plant cell photosynthesis occurs in.

What's your favourite food?

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The simple story of photosynthesis and food 

Explain why you won't be able to survive 

if plants did not have chloroplasts.

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Work in small groups: Observe a sample from a plant under a microscope

chloroplast

What makes the chloroplast green?

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What does the chlorophyll do?

- captures the energy from the sunlight.

- The energy helps the water and carbon dioxide to react together.

Why is chlorophyll green?

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Why is chlorophyll green?

When do plants make more carbohydrates (starch)?

1. warm, sunny day
2. cool, sunny morning
3. at night
4. warm, springtime

What does the inside of a leaf look like?

MAGNIFIED VIEW - Cross-sectional area of a leaf

spongy layer

palisade layer

upper epidermis

lower epidermis

stoma (opening)

waxy layer

xylem (in the vein)

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How does photosynthesis happen here?

___________ is the movement of particles from a place of many particles to a place of a few particles.

1. Diffusion
2. Motion
3. Vibration
4. Transport

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Carbon dioxide diffuses into the leaf.

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• I will know which part of the plant cell photosynthesis occurs in.

How well did you participate 

in the lesson today?

05

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Unit 1 - Photosynthesis and the Carbon Cycle

More about Photosynthesis

11 November 2025

How do you feel today?

😒🙁😐🙂😃

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• I will understand why plants need magnesium and nitrate.

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Scenario:

Villa notices his plant's leaves turning yellow. He is wondering what causes this, as he always takes care of his plant by watering it and ensuring it gets enough sunlight. Help him figure out how he could save the plant.

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Minerals and Plant Growth

Give one reason why farmers add 

fertiliser to their fields.

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Minerals and Plant Growth

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Minerals and Plant Growth

from nitrates (NO₃⁻ )

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Minerals and Plant Growth

magnesium ions (Mg²⁺)

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Minerals and Plant Growth

from nitrates (NO₃⁻ )

magnesium ions (Mg²⁺)

What plant organ absorbs water and

minerals from the soil?

1. stem
2. leaf
3. roots
4. flowers

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How are the minerals and water absorbed?

Which minerals are needed to make the green pigment, chlorophyll?

1. nitrates
2. manganese
3. magnesium
4. potassium

Which mineral contains nitrogen atoms, which are needed to convert carbohydrates to proteins?

1. nitrates
2. manganese
3. magnesium
4. potassium

___________ are essential for making new cells, so that the plant can grow.

1. Fats
2. Ccarbohydrates
3. Magnesium
4. Proteins

Without enough of this nutrient, leaves die, and 

the plant stays small.

1. Nitrogen
2. Potassium
3. Magnesium
4. Manganese

Without enough of this mineral, the plants' leaves 

look yellow instead of green.

1. Nitrogen
2. Potassium
3. Magnesium
4. Manganese

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Relationships between Minerals and Plant Growth

with magnesium and nitrate

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Relationships between Minerals and Plant Growth

with magnesium and nitrate

more chlorophyll

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Relationships between Minerals and Plant Growth

with magnesium and nitrate

more chlorophyll

more photosynthesis

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Relationships between Minerals and Plant Growth

with magnesium and nitrate

more chlorophyll

more photosynthesis

more carbohydrates (starch)

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Relationships between Minerals and Plant Growth

with magnesium and nitrate

more chlorophyll

more photosynthesis

more carbohydrates (starch)

converting more carbohydrates to proteins

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Relationships between Minerals and Plant Growth

with magnesium and nitrate

more chlorophyll

more photosynthesis

more carbohydrates (starch)

converting more carbohydrates to proteins

grow more because more cells are made and healthier plants

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Unit 1 - Photosynthesis and the Carbon Cycle

More about Photosynthesis

11 November 2025

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• I will be able to prove that photosynthesis occurs primarily in the plant's leaves, which contain chlorophyll.

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What the Result Would Look Like

Before

After

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Work in small groups: Carry out - Testing a leaf for starch (pages 17-18, LB)

beaker

water

leaf

wire gauze

tripod

Bunsen burner

ethanol

hot water

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Work in small groups: Carry out - Testing a leaf for starch (pages 17-18, LB)

white tile

leaf heated in ethanol

dropper with iodine solution

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2 minutes

Work in small groups: Carry out - Testing a leaf for starch (pages 17-18, LB)

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Work in small groups: 

Answer questions 1-4 on page 18, LB.

Use a separate sheet.

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• I will know which part of the plant cell photosynthesis occurs in.
• I will understand why plants need magnesium and nitrate.
• I will be able to prove that photosynthesis occurs primarily in the plant's leaves, which contain chlorophyll.

How well did you enjoy the lesson today?

05

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Assesses student comprehension through a worksheet, quiz, a lab report, or a concluding class discussion.

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• I will know which part of the plant cell photosynthesis occurs in.
• I will understand why plants need magnesium and nitrate.
• I will be able to prove that photosynthesis occurs in the plant's leaves.

How well did you enjoy the lesson today?

05