Topic Review: How does planet Earth support life?

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

How are dandelion seeds dispersed?

• By animals

• By explosion or bursting

• By wind

Why is it 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.

I am a seed and have parachute like structures.

What is likely my dispersal method?

• Wind

• Water

• Animal

• Explosive action

I am a seed and have hooks to cling to fur.

What is likely my dispersal method?

• Wind

• Water

• Animals

• Explosive action

My pod splits open and seeds are thrown out with a force.

What is likely my dispersal method?

• Wind

• Water

• Animals

• Explosive action

Which characteristics are ideal for dispersion by wind?

• Small, light and hair-like

• Small, light and sharp hooks

• Big, light and fibrous husk

• Big, light and explode

Soil is made of ______.

• weathered rocks and minerals

• dead plants and animals

• air and water

• all of the above

When plants, animals, and other organisms die, they break down and become part of the soil.

What is this part of the soil called?

• Sand

• Silt

• Clay

• Humus

Which factors are primarily responsible for decomposition of organic materials in soil?

• Animal action and plant action.

• action.

  Animal action and fungus action.

• Fungus action and microorganisms.

• Microorganisms and animal action.