Practice Questions

1. State the names of two common plant diseases

Rose black spot and tobacco mosaic virus

2. Describe how a soil that is deficient in nitrate ions could affect cabbage plants

If the soil is nitrate ion deficient, then less proteins will be produced for growth, this will lead to stunted growth and low yield of crop.

3. Describe how aphids can cause harm to plants.

Aphids pierce phloem with their sharp mouthparts and suck sap from phloem.

This can cause:

1.Stunted growth of plant

2.Curling or malformed leaves and stems

3.Reduced yield of crop