Science 7, Unit 2: Plants for Food and Fibre

For the seeds of a flowering plant to properly develop so they might grow into new plants, the flowers of the parent plant must be:

• treated with fertilizer

• pollinated

• pruned

• bloomed

Given the diagram shown above, in which direction will the particles (shown as ) initially move the most if the barrier is removed?

• From side A to side B

• They will remain where they are

• From side B to side A

• You cannot tell – it depends on what the particles are made of

Which of the following organisms play a special role in the formation of soil in cool areas with acidic soil, like forests?

• Bacteria

• Earthworms

• Fungi

• Nematodes

Which of the following abiotic factors helps most in the formation of soil?

• Earthworms

• Sunshine

• Bacteria

• Water

In hydroponic growing chambers, plants are grown in water, not soil. What must be added to the water in order to keep the plants alive?

• Nutrients and minerals

• Heat

• Water

• Oil

Sarah has a flower garden. Her flowers are not growing well because they keep drying out although she waters them regularly. She looks at the soil and notices it is composed mostly of sandy particles. What could she add to the soil to help it retain more water?

• Compost

• Sand

• Calcium

• Water

Organic farming is defined as:

• Farming using compost

• Farming where humans, not machines, do all the work

• Farming without the use of chemical soil additives or methods of pest control

• Farming using pest control techniques like herbicides and pesticides

Plant habitats with many different plant species are most resistant to insect attack and disease. They also tend to grow and reproduce well in a range of different growing conditions. Which of the following situations does not represent an environment with high plant diversity?

• A monoculture such as a field of canola

• Natural prairie land

• Boreal forest

• Tropical rainforest

Years of agricultural technology have produced seeds for crops that are specialized for specific purposes, such as maturing quickly or being good producers. What is a problem with having large crops of such specialized plants?

• The whole crop is more susceptible to pests and disease

• The plants have trouble reproducing successfully

• The crop requires extra nutrients in the form of fertilizers

• All of the above