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GROW · SCIENCE · Lesson 1 of 6

A pollen delivery mystery

Learning intention

Describe pollination, fertilisation and seed formation as different connected processes.

Pollen reaches a plant. Does that guarantee a seed?

We will follow the destination and the next processes.

Success looks like

  • Trace pollen from anther to stigma.
  • Distinguish pollen transfer from fusion of gametes.
  • Explain that a fertilised ovule develops into a seed.
Retrieval

GROW · SCIENCE · Lesson 1 of 6

Recover the plant words

R1. Name a flowering-plant part.

R2. What can a seed grow into in suitable conditions?

R3. Does reproduction mean the parent grows taller?

I do

GROW · SCIENCE · Lesson 1 of 6

I trace the correct delivery destination

Anthers produce pollen.

A stigma receives pollen.

Pollination names this transfer.

Selected flower structures and pollen transferA simplified flower section labels anther, pollen, stigma, style, ovary and ovule. A pollen-transfer arrow goes from anther to stigma; it does not lead directly to a seed.Pollination: pollen reaches a stigmaAnther:makes pollenStigma:receives pollenStyleOvaryOvuleSelected structures only; not to scale. Petals are omitted.
Selected flower structures and pollen transfer
Diagram description

A simplified flower section labels anther, pollen, stigma, style, ovary and ovule. A pollen-transfer arrow goes from anther to stigma; it does not lead directly to a seed.

I do

GROW · SCIENCE · Lesson 1 of 6

I distinguish the event inside the ovule

Compatible pollen can grow a tube.

A male gamete reaches an egg cell.

Their fusion is fertilisation.

After compatible pollen arrivesA pollen grain on the stigma grows a tube through the style towards an ovule. The tube delivers male gametes. A male gamete fuses with an egg cell inside the ovule; the pollen grain itself does not turn into a seed.Fertilisation happens after pollinationPollen grain growsa pollen tubeMale gametetravels throughthe tubeEgg cellinside an ovuleGametes fuse:fertilisationOne key fusion is shown; advanced double-fertilisation detail omitted.
After compatible pollen arrives
Diagram description

A pollen grain on the stigma grows a tube through the style towards an ovule. The tube delivers male gametes. A male gamete fuses with an egg cell inside the ovule; the pollen grain itself does not turn into a seed.

Continue within this stage’s shared time.

I do

GROW · SCIENCE · Lesson 1 of 6

I name what develops into a seed

The fertilised ovule develops into a seed.

The ovary develops into fruit.

A pollen grain does not turn into the seed.

Two structures develop after fertilisationTwo parallel developmental links: fertilised ovule develops into seed; ovary develops into fruit. The pollen grain is not shown becoming a seed.After fertilisation: identify the structureFertilised ovuleSeedOvaryFruitA seed contains a young plant embryo; fruit surrounds seeds.
Two structures develop after fertilisation
Diagram description

Two parallel developmental links: fertilised ovule develops into seed; ovary develops into fruit. The pollen grain is not shown becoming a seed.

Continue within this stage’s shared time.

We do

GROW · SCIENCE · Lesson 1 of 6

Orchard evidence desk

Go to interactive investigation

Use records A–F.

W1. Which record shows pollination?

Which record shows only pollen in the wrong place?

Observed recordWhat can we establish?
A: anther → suitable stigmaPollen transfer
D: pollen on leafWrong destination in this record
E: pollen on stigma; inside unseenTransfer, but fusion not observed

Orchard audit: predict the process

Predict first, test the model, then explain using the evidence. Move at your own pace; paper W1–W3 tasks assess the same reasoning.

Decision 1 of 3

Where must pollen arrive for pollination?

Choose, test, then explain together. Evidence diagrams appear only after your test. Diagram transitions explain the model; they do not represent real elapsed time. Use Pause model to stop transitions and model controls, or your device’s reduced-motion setting. The printed We do activity provides the paper route.

We do

GROW · SCIENCE · Lesson 1 of 6

Audit the missing step

W2. Put A, B and C in process order.

Explain what changes from transfer to fusion to development.

Continue within this stage’s shared time.

We do

GROW · SCIENCE · Lesson 1 of 6

What does the evidence prove?

W3. Record E has pollen on a stigma.

Can the observer claim fertilisation definitely happened?

Give the strongest claim that the record supports.

Continue within this stage’s shared time.

Hinge

GROW · SCIENCE · Lesson 1 of 6

Which structure becomes a seed?

Choose the scientifically accurate explanation.

You do

GROW · SCIENCE · Lesson 1 of 6

Your independent investigation

Choose one response route.

Trace the flower-to-seed sequence.

Use records to separate observation from inference.

You do

GROW · SCIENCE · Lesson 1 of 6

Use the evidence

Name the destination: anther to stigma.

Distinguish transfer, fusion and development.

State what the observer has actually seen.

Continue within this stage’s shared time.

You do

GROW · SCIENCE · Lesson 1 of 6

Check before sharing

Does my explanation answer the question?

Have I named the evidence or process?

Have I kept the conclusion within its limits?

Continue within this stage’s shared time.

Review

GROW · SCIENCE · Lesson 1 of 6

Compare and improve

Share one accurate arrow or process label.

Check it against the source cards.

Improve a seed or fertilisation claim.

Review

GROW · SCIENCE · Lesson 1 of 6

A question worth investigating

Suggest one next question about this lesson’s evidence.

Choose a question whose answer would improve our model.

Continue within this stage’s shared time.

Exit

GROW · SCIENCE · Lesson 1 of 6

Show the science you can explain

E1. What is pollination?

E2. How is fertilisation different?

E3. What develops into a seed?

My science task sheets

Choose one route with your teacher. Shared evidence and the exit sheet appear in every route. Your work stays here while the page is open; save it before closing.

1 • Shared evidence: orchard records

These are constructed observation scenarios, not results from a class experiment.

A • Transfer event

A bee carries pollen from an anther to a stigma of a suitable flower. This is pollen transfer, not the fusion event.

B • Inside the flower

After compatible pollen arrives, a pollen tube can grow. A male gamete can reach an egg cell in an ovule and fuse with it.

C • Development

After successful fertilisation, an ovule develops into a seed; the ovary develops into fruit. Other conditions also affect success.

D • Wrong destination

Pollen is seen on a leaf. No pollen is seen on the stigma in this record. The record does not show pollination.

E • Incomplete evidence

Pollen is seen on a stigma. The inside of the ovule has not been observed. Pollen transfer alone does not prove fertilisation occurred.

F • Model boundary

This model follows sexual reproduction in a flowering plant. It omits detailed cell structures and time scales; no class growing experiment took place.

2 • Supported route: follow the pollen

Word bank: anther / stigma / ovule / pollination / fertilisation.

S2. What is that transfer called?
S4. Which develops into a seed?

3 • Standard route: process investigator

Use source cards A–F.

ProcessWhat happens?
Pollination
Fertilisation
Seed formation

4 • Stretch route: audit the orchard claim

Use precise biological structures and bounded evidence.

5 • Exit and reflection

Use a short explanation or labelled route.

Slide 1

TA Brief

Current stage

Objective

Describe pollination, fertilisation and seed formation as different connected processes.

Preparation

Method precautions

Practical alternative

Trace paper pollen and stage cards using the supplied observations. No live plant, internet or completed growing trial is needed.

Access and regulation

Supported: Order named stages using prompts and label the main route.

Standard: Explain the three processes and interpret an orchard evidence set.

Stretch: Evaluate a pollination guarantee and explain limits of the observations.

Regulation: Offer private writing, pointing, drawing or adult scribing. Allow pass-and-return for public questions and desk-based participation. Choose support from current learning evidence, not fixed ability labels.

Teacher answers

R1–R3

R1 valid plant part. R2 a new plant in suitable conditions. R3 no; reproduction produces offspring, whereas growth develops an individual.

W1–W3

W1 A shows pollination; D has pollen on a leaf, not the required stigma. W2 A→B→C: transfer, fusion, development. W3 pollen on stigma is observed; successful fusion and later seed development are not established by that observation alone.

Hinge A–C

A incorrect: pollen does not become seed. B correct. C incorrect: ovules, not leaves, develop into seeds in this model.

S1–S5

S1 anther; stigma. S2 pollination. S3 fertilisation. S4 fertilised ovule. S5 pollen reaches stigma→gametes fuse→seed develops; any accurate arrow explanation.

N1–N4

N1 pollination: anther-to-stigma transfer; fertilisation: fusion of male/female gametes; seed formation: fertilised ovule develops. N2 pollen arrives at stigma, tube grows and delivers male gamete to egg cell in ovule. N3 leaf is not stigma. N4 transfer is evidenced, not later fertilisation or mature seed success.

T1–T4

T1 accurate connected sequence, with distinct transfer and fusion. T2 bees can transfer pollen, not plant seeds into ovaries; ovules develop into seeds and ovaries into fruit. T3 compatible pollen, tube growth/gamete delivery, fertilisation and suitable development conditions remain relevant; choose two without requiring technical detail. T4 separate dated records for pollen arrival on stigma and later seed formation, with a matched observation method; arrival supports pollination, later mature seeds support successful development in the sexual example. A record should not claim unobserved cellular detail.

E1–E4 / assessment

E1 transfer anther→stigma. E2 fusion of gametes. E3 ovule→seed, ovary→fruit. E4 incorrect destination. Secure: clear distinction of the three processes and correct structure development. Re-teach by assigning a different verb to each arrow. Reflection has no fixed choice.

Sources checked for this lesson

Word help

pollen
Grains that carry the male reproductive cells in flowering plants.
pollination
Transfer of pollen from anther to stigma.
stigma
The flower part that receives pollen.
ovule
A structure in the ovary containing an egg cell; it can develop into a seed.
fertilisation
Fusion of male and female gametes.
gamete
A reproductive cell such as an egg cell.

Cold Call

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