Plants for Food and Fibre: Topics 3 + 4 Review

In order to make an artificial environment work without soil, plants are grown in a..

• Hydrofoil
• Nutrient solution
• Hydroponic
• Hydrogenerate

Healthy high yield crops require large amounts of nutrients. All of these nutrients have specialized functions. Fertilizer usually contains three of the six nutrients, including...

• Nitrogen, potassium, sulfur
• Phosphorus, calcium, carbon
• Potassium, nitrogen, phosphorus
• Magnesium, potassium, calcium

Soil is a natural resource. The components of soil include organic matter and minerals. When soil contains partly decayed organic matter it is called...

• Clay
• Sand
• Humus
• Vegetative

Plants prevent the process that moves soil from place to place, because their roots hold the soil in place. This process is...

• Erosion
• Respiration
• Weathering
• Protection

Organic food is food that has been grown without the use of chemical fertilizers and chemical pesticides. To provide the needed nutrients to grow plants, they use..

• Manure and compost
• Insects and weeds
• Industrial fertilizer and herbicides
• Clean equipment and good seeds

Humus is.....

• the dead parts of plants and animals in soil.
• A food we eat with pretzels.
• The tiny particles inside of soil
• The roots that come off of a plant and live in soil.

This type of soil is made of tiny pieces of rock. 

• sand
• clay
• humus
• loam

Which of the following types of soil has the largest particles?

• sand
• silt
• humus
• clay

_______ is the type of soil used most often with plants and on farms. It is a mixture of clay, sand, and silt.

• loam
• humus
• soil
• dirt

Which type of soil can hold the greatest amount of water?

• sand
• silt
• clay
• loam