The Martian - Soil

The smallest particles that are part of soil are

• silt

• clay

• dust

• sand

The component of soil that is best at retaining water is

• clay

• sand

• organic matter

• silt

The 3 primary soil nutrients are

• N, P, K

• P, Mg, K

• N, Ca, P

• N ,P, Fe

Which element is most abundant in plants?

• N

• O

• K

• C

Why are fungi and bacteria important for soil?

• They help soil retain water.

• They contain nutrients that are important for plants.

• The break down organic matter so plants can access nutrients.

• They add biodiversity to soil.

In what part of the plant does cellular respiration occur?

• In every cell.

• Plants perform photosynthesis, not cellular respiration.

• In the leaves.

• In the roots.

What does "saturation" mean, in reference to soil?

• It means the soil has all the nutrients necessary for plant growth.

• It means that the roots have access to adequate O₂.

• It means that there is enough organic matter.

• It means all the pore spaces are filled with water.

Which gases do plants need?

• O₂

• NH₃

• K⁺

• CO₂

What do plants use N for?

• To make all macromolecules.

• To make ATP.

• To make proteins.

• For cell water regulation.

What do plants use K for?

• To make all macromolecules.

• To make ATP.

• To make proteins.

• For cell water regulation.