Which two statements explain why commercial growers usually choose to plant runners that were produced asexually?

Tick ($✓$) two boxes.

• Plants grown from runners will grow and produce fruit much faster than those grown from seeds.
• The grower will be certain of the fruit taste and quality of the strawberry plants grown from runners.
• Strawberry plants grown from seed will not need to photosynthesise.
• Strawberry plants grown from seed will not require water.
• Strawberry plants grown from seed will all be genetically identical to each other.

In a strawberry field, growers found that a small number of plants developed distorted, yellow-mottled leaves.

Complete the sentences to show two possible explanations for these symptoms. Use words from the list below:

$$antibodygenemutationpathogenphenotypeproducer$$

• The strawberries could be diseased because they have been infected by a ____________.
• Another explanation is that a ____________ has occurred in the DNA of the strawberry plant.
• This is a change in the ____________ that codes for leaf development protein chemicals.

It was not until the mid-20th century that scientists could confirm that many of these strawberry leaf diseases were caused by viruses.

Suggest why it took so long to identify viruses as the cause of the disease.

This virus is spread by aphids, which are insects that feed on the sap of the strawberry plants.

To control the spread of the disease, growers can use two approaches:

• Dig up and burn any strawberry plants as soon as they show symptoms.
• Spray their fields with chemical insecticides.

Explain how these two different methods would control the disease. Discuss the advantages and disadvantages of each method.