Agenda Do Now: Take out your notebook and

study for 5 min Quiz Seed Dispersion Notes Seed Dispersion Video

AIM: SWBAT describe the different adaptations plants have evolved

to spread their seeds around

Please Do Now: What are the three main parts of the seed?

What is seed dispersal? Seed dispersion is

the transport or movement of seeds away from the parent plant

Why do seeds need to disperse? Plants need to disperse

away from the parent plant because in general the resources around the parent plant are already being exploited by the parent

Seeds that sprout right under the parent have to compete with it, and hurt the parent as well

Different Modes of Dispersion Wind Water Animals Mechanical

How are seeds adapted to Wind Dispersal?

Seeds are adapted to be carried by the wind, often with some sort of “sail”

Common in windy areas

Actually seeds are very small (small endosperm)

Very random

How are seeds adapted to Water dispersal?

Common in plants that live in or around water

Seeds don’t have to be light, do have to float

Can only take seeds right around water

How are seeds adapted to Mechanical Dispersal?

Some seed bearing structures are designed like a catapult to “shoot” seeds away from the plant when ripe

Not dependent on animals or the weather

Can’t go very far from parent

How are seeds adapted to Animal dispersal?

Can happen in three ways:• In the digestive tract• ON the surface of

the animal• When seeds

predators hoard and forget about them

In the digestive tract Many seeds are

found inside fruits, which animals eat, then defecate out later

Seeds are tough to survive the passage

End up in a little pile of fertilizer to start life

On animals Some seeds have

sticky hairs or pointy barbs that get stuck to fur when animals walk by

Seed Predators Squirrels find some

seeds, stash hem away in a whole, forget about them or get killed, and the seeds germinate

Take Away from Today The seeds and their

surrounding structures are adapted to their particular form of dispersion

This takes an investment in energy• Ex: fruit for animal

dispersers• Ex: Wind dispersers

are tiny with a sail

Summarize Seed dispersal is ______. It is

necessary ________. It can happen in multiple ways.

Summarize Seed dispersal is _the movement of

seeds away from the parent plant_. It is necessary _to avoid competition with the parent plant_. It can happen in multiple ways.

During the video In your notebook, describe 1 example

you see of the 4 different modes of dispersal we discussed (water, wind, animal, mechanical).