Plant disease

How do plants obtain mineral ions?

• Through their leaves

• they absorb them from soil water using their roots

• Through their stem

A plant has yellow leaves. What is the correct term for yellow leaves?

• chlorophyll

• chloroplasts

• chlorosis

• chlorine

If a plant has yellow leaves it is deficient (lacking) in which mineral ion?

• nitrate

• potassium

• magnesium

• phosphate

What is the consequence of yellow leaves (chlorosis) for the plant?

Choose all the correct answers.

• Reduced photosynthesis and stunted growth.
• Less chlorophyll so less light is absorbed

• the plant will wilt

Why do plants need nitrate ions?

• nitrates are needed so the plant can absorb water

• nitrates are needed to make chlorophyll

• Nitrates are needed for the plant to make protein needed for growth

Rose black spot is a plant disease caused by a

• virus

• fungus

• bacterium

• protist

TMV is a plant disease caused by a

• fungus

• protist

• bacterium

• virus

What is shown here?

• black spot fungus

• aphid infestation

• chlorosis

This picture shows a crown gall. This is a big growth on the stems or trunks of trees. Which type of pathogen causes this?

• Bacterium

• fungus

• virus

• protist

The plants on the left show stunted growth. What is the most likely cause of this?

• A lack of nitrate ions

• A lack of magnesium ions

• A lack of water