Chapter 8 - Plant Disease

Question 1

What is plant diseases are caused by the three main pathogens?

Answer 1

Viruses
Bacteria
Fungi

Question 2

What is the tobacco mosaic virus?

Answer 2

It is the common pathogen of many plants.
It gets its name because it causes the leaves to be infected and have discoloured patterns on the leaves that resemble a mosaic.
It is a viral disease for plants.
It reduces the amount of photosynthesis and the amount of glucose produce for growth.

Question 3

What is the rose blackspot disease?

Answer 3

It is a fungal disease for plants

it infects many roses.

Question 4

What is rice blast?

Answer 4

It is caused by the fungus. It can infect wheat, rye and barley.
It produces lesions (rough bumpy areas) on rice stems and leaves.

Question 5

What are nematode worms!

Answer 5

Small, multicellular, work like animals. Live freely in the soil and are harmless to plants however some are found in plant roots and destroy them.

Question 6

Why are Aphids?

Answer 6

Tiny insects that are found in large numbers sucking the sap from the stems of the plant.

Question 7

What are the variety of symptoms of disease that infected plants?

Answer 7

Stunted growth 
Spots or growths on leaves or stems 
Malformed stems or leaves 
Discolouration 
Areas of decay (rotting) 
The presence of pets