GCSE OCR Gateway Biology Health & Disease: This question is about plant dis

Question

This question is about plant diseases.

(a)  Plant diseases can be caused by bacteria, fungi or viruses.

Complete the table by choosing words from this list to identify the cause of each of the diseases.

You can use each word once, more than once, or not at all.

| Name of disease          | Cause    |
|-------------------------|----------|
| Barley mildew           |          |
| Crown gall disease      |          |
| Tobacco mosaic disease  |          |

(b)  Tomatoes are an important food crop. They can be infected by a number of different pathogens.

It is important that farmers can identify which pathogen is infecting their tomatoes as soon as possible.

Give two reasons to explain why.

1

2

(ii)  The diagram shows the results of scanning three different tomato leaves.

One leaf has early blight, one has late blight and the other is healthy.

**Key:**
- healthy
- early blight
- late blight

The scientists think that they only need to shine light of one wavelength at the leaf to decide if it is healthy or which disease it has.

Suggest a wavelength that the scientists could use.

Wavelength:

Explanation:

This question is about plant diseases - OCR Gateway - GCSE Biology - Question 18 - 2021 - Paper 1

Worked Solution & Example Answer:This question is about plant diseases - OCR Gateway - GCSE Biology - Question 18 - 2021 - Paper 1

Complete the table for Barley mildew

Complete the table for Crown gall disease

Complete the table for Tobacco mosaic disease

Give two reasons why early identification of pathogens is important

Suggest a wavelength that the scientists could use

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