6e Plant disease (triple only) Flashcards
Give 7 ways in which plant diseases can be detected.
Stunted growth
Spots on leaves
Areas of decay (rot)
Growths
Malformed stems or leaves
Discolouration
Presence of pests
Give three ways in which a plant disease can be identified
Reference to a gardening manual or website
Take plant to laboratory to identify the pathogen
Use testing kits that contain monoclonal antibodies
Name a plant disease caused by a fungus
Black spot
Name the plant disease
Black spot
Name a plant disease caused by a virus
Tobacco mosaic
Name a pest that can cause a plant disease
Aphid
Why do plants need nitrate ions for healthy growth
Needed to make amino acids and then proteins
Name the pest
Aphid
Why do plants require magnesium ions?
To make chlorophyll
A stunted plants is likely to be deficient in which mineral ion?
Nitrates
A plant showing chlorosis is likely to be deficient in which mineral ion?
Magnesium
Why are plants with a nitrate deficiency often stunted?
Lack of amino acids
Less protein made
Less chlorophyll made (protein)
Lack of light absorbed
Rate of photosynthesis decreases
Less glucose made
Fewer resources available for cell division
Name the plant disease
Tobacco mosaic disease
Name the plant disease
Chlorosis
What does the term chlorosis mean?
Chlorophyll has been broken down
Why do aphids cause plants to be stunted?
Aphids feed on the sugars
Sugars removed from phloem tissue
Lack of sugar transported around plant
Fewer resources for cell division
