1AGT 6.8 Sowing the seeds

• Biologie
• Middelbare school
• vwo
• Leerjaar 1

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2TH 7.2 Voedselketens en kringlopen

§6.8

 Sowing the seeds

1AGT

Lesson plan

• Look back to §6.7
• Theory §6.8
• Homework
• Exit question 

§6.7 was about fertilisation.
What is fertilisation?

Recap §6.7

After pollination:

• Pollen grains form a pollen tube.
• To carry the nucleus of the pollen grain to
  the ovaries.
• Enters the ovules and fertilizes the egg cell.
• The ovules become seeds, the ovary
  becomes the fruit.

How many times did this plant get pollinated, and how many seeds will their fruit have?

1. Pollinated: 2 Seeds: 2
2. Pollinated: 5 Seeds: 5
3. Pollinated: 2 Seeds: 5
4. Pollinated: 5 Seeds: 2

Lesson objectives

1. After today's lesson you can explain in what ways seeds of plants can be dispersed (relocated).

Seeds

Seeds are the start of the
life cycle of a plant.

What did a life cycle of a plant look like? §6.1

The root grows bigger and the stem starts to grow out of the soil.

The plant grows flowers, fruit and eventually new seeds.

The plant grows out of the seed, root first.

The first leaves start to grow.

The young plant grows and develops more leaves and roots.

Germinating

A seed germinates best when it has no competition for:

• Water
• Carbon dioxide
• Light

Discuss why plants have to disperse
their seeds to prevent competition.

Seed dispersal

Scattering seeds away from the parent plant.

• Done by the wind.
• Done by animals.
• Done by the water.
• Done by the plant itself.

By animals

Hooks on the seeds.

• Hang on to fur.

Get eaten.

• Did not get digested: poop.

By the wind

Pepper-pot type.

• Containers with seeds.

Parachute type.

• Feathery hairs.

Winged type.

• Spinning in the wind.

By water

Seeds fall in the water, water
carries it away.

By explosion (the plant themselves)

When the seeds are ripened, they will
split open their shell
and 'fly out'.

• Lots of force, like an
  explosion.

In what way do these seeds get dispersed?

Animals (L)

Animals (R)

Wind (parachute)

Wind (pepper-pot)

Homework §6.8

Get started on assignment number 1, 2, 3, 4 and 5.

• You can work in pairs, only if you can whisper.

When you're done, you can:

• Make a glossary or a summary.
• Practice www.biologiepagina.nl with the dispersal of seeds (Dutch website, but the biology stays the same).

Checking homework

Forgot to make it?

• 1 red cross + name is added to spinner
• 3 red crosses? Detention
  

You did make it?

• 1 green cross
• 3 green crosses? Name is removed
  from spinner

Did we meet todays goals?

1. Can you explain in what ways seeds of plants can be dispersed (relocated)?

Exit ticket: How does spreading pollen
differ from spreading seeds?