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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).