GCSE Biology - Plant Disease and Defences #46

The video tutorial explains how plants can contract diseases from microorganisms and larger organisms, as well as deficiency diseases due to lack of essential minerals. It describes symptoms of plant diseases and methods for diagnosing them, including observation, consulting experts, and trial and error. The video also covers plant defenses, which are categorized into physical, chemical, and mechanical defenses, highlighting how plants protect themselves from pathogens and pests.

What can cause deficiency diseases in plants?

• Too much fertilizer

• Insufficient essential minerals

• Lack of sunlight

• Excessive water

Which mineral is crucial for chlorophyll production in plants?

• Iron

• Magnesium

• Potassium

• Calcium

What is a basic method for diagnosing plant diseases?

• Consulting a plant pathologist

• Using a microscope

• Trial and error

• DNA testing

Which of the following is a chemical defense used by plants?

• Antimicrobial substances

• Waxy cuticle

• Cellulose walls

• Thorns

What is the role of mechanical defenses in plants?

• To enhance photosynthesis

• To deter animals from eating them

• To act as a physical barrier

• To prevent water loss