REVISION BOOK BIOLOGY YEAR 9 EASTER TERM

The purpose of seed dispersal is for the seeds to __________.

• germinate at the same time

• move to the same place and grow

• move further away from the parent plant

• compete with one another for minerals in the soil

Why it is better for seeds to be scattered far and wide?

• To provide shelter to other animals.

• For farmers to see which soil is good for the plants.

• For plants to have a better chance of growing healthier.

What are the characteristic of the seeds dispersed by man and animals?

A: Can float on water

B: Sweet and juicy

C: Have hooks or stiff hairs

D: Have wing-like structures and are light

• A and B only

• B and C only

• C and D only

• A, B and C only

A mystery fruit was said to be dispersed by water.

How can one confirm this statement?

A: Place the fruit on water to see if it floats.

B: Find the mass of the fruit by putting it on a weighing scale.

C: Throw fruit in the air and see the wind blows it.

D: Cut the fruit to see if it contains water.

• A

• B

• C

• D

State the characters ideal for dispersion by wind.

• Small, light and hair-like

• Small, light and sharp hooks

• Big, light and fibrous husk

• Big, light and explode

How are coconuts dispersed?

• by animals

• by water

• by wind

How are raspberries dispersed?

• by animals

• by explosion or bursting

• by water

My pod splits open and seeds are thrown out with a force. What is likely my dispersal method?

• wind

• water

• animals

• explosion

How are dandelion seeds dispersed?

• by animals

• by explosion or bursting

• by wind

I have parachute like structures. What is likely my dispersal method?

• wind
• water 
• animals
• explosive action