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Questions and Answers
Aphids damage plants directly and indirectly. Which statement best describes the indirect damage caused by aphids?
Aphids damage plants directly and indirectly. Which statement best describes the indirect damage caused by aphids?
- Aphids act as vectors, transmitting pathogens between plants. (correct)
- Aphids block the phloem, preventing sugar transport and causing stunted growth.
- Aphids directly weaken the plant by consuming essential nutrients.
- Aphids introduce fungal infections through the wounds created during feeding.
A farmer observes stunted growth and yellowing leaves (chlorosis) in their crop. Which combination of nutrient deficiencies is most likely responsible?
A farmer observes stunted growth and yellowing leaves (chlorosis) in their crop. Which combination of nutrient deficiencies is most likely responsible?
- Nitrate deficiency causing stunted growth, and magnesium deficiency causing chlorosis. (correct)
- Magnesium deficiency causing stunted growth, and phosphate deficiency causing chlorosis.
- Magnesium deficiency causing chlorosis, and potassium deficiency causing stunted growth.
- Phosphate deficiency causing stunted growth, and nitrate deficiency causing chlorosis.
A gardener notices an increasing aphid population on their rose bushes. They decide to introduce ladybirds to control the aphids. What type of pest control is the gardener employing?
A gardener notices an increasing aphid population on their rose bushes. They decide to introduce ladybirds to control the aphids. What type of pest control is the gardener employing?
- Chemical pest control
- Integrated pest management
- Mechanical pest control
- Biological pest control (correct)
Why is a continuous supply of nitrate ions crucial for plant growth?
Why is a continuous supply of nitrate ions crucial for plant growth?
A plant's leaves are turning yellow, a condition known as chlorosis. Which of the following is the most likely cause?
A plant's leaves are turning yellow, a condition known as chlorosis. Which of the following is the most likely cause?
A farmer is concerned about a potential aphid infestation in their field. Which of the following strategies would directly reduce the number of aphids?
A farmer is concerned about a potential aphid infestation in their field. Which of the following strategies would directly reduce the number of aphids?
What role do magnesium ions play in a plant's ability to photosynthesise?
What role do magnesium ions play in a plant's ability to photosynthesise?
Which symptom is most indicative of a nitrate deficiency in plants?
Which symptom is most indicative of a nitrate deficiency in plants?
A plant exhibits discolouration and malformation of its leaves. Which of the following is the MOST likely initial step to identify the cause of these symptoms?
A plant exhibits discolouration and malformation of its leaves. Which of the following is the MOST likely initial step to identify the cause of these symptoms?
Which of the following is an example of a plant employing a chemical defense response against pathogens or herbivores?
Which of the following is an example of a plant employing a chemical defense response against pathogens or herbivores?
If a plant's leaves are decaying/rotting, what could that indicate?
If a plant's leaves are decaying/rotting, what could that indicate?
How does a tough waxy cuticle on the surface of a leaf help a plant?
How does a tough waxy cuticle on the surface of a leaf help a plant?
Which defence mechanism involves a plant tricking animals?
Which defence mechanism involves a plant tricking animals?
A plant is infected with a pathogen. Which of the following responses is an example of a physical defense mechanism?
A plant is infected with a pathogen. Which of the following responses is an example of a physical defense mechanism?
Why might a plant benefit from dropping its leaves when infected?
Why might a plant benefit from dropping its leaves when infected?
How do monoclonal antibody test kits contribute to plant disease management?
How do monoclonal antibody test kits contribute to plant disease management?
Flashcards
Aphid Damage
Aphid Damage
Aphids use sharp mouthparts to extract sap, weakening the plant. They also act as vectors, transferring pathogens between plants.
Aphid Control
Aphid Control
Reduce aphid populations using chemical pesticides or biological control methods like introducing ladybirds.
Nitrate Importance
Nitrate Importance
Nitrate ions are needed to convert sugars into proteins, which are essential for plant growth. Lack of nitrates leads to stunted growth.
Magnesium Importance
Magnesium Importance
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Symptoms of Disease
Symptoms of Disease
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Rose black spot
Rose black spot
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Signs of plant disease
Signs of plant disease
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Identifying plant disease
Identifying plant disease
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Physical plant defenses
Physical plant defenses
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Chemical plant defenses
Chemical plant defenses
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Mechanical plant defenses
Mechanical plant defenses
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Waxy cuticle
Waxy cuticle
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Leaf Fall defense
Leaf Fall defense
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Study Notes
- AQA Biology GCSE 3.3 - Plant Disease
Aphids
- Aphids use sharp mouthparts to extract sap from plant phloem
- This weakens the plant
- Aphids can act as vectors, transferring pathogens from diseased to healthy plants
- Aphid numbers can be reduced using chemical pesticides
- Biological pest control using ladybirds can curb aphid populations
Nitrate Ions
- Plants need nitrate ions to convert sugars into proteins
- Proteins enable plant growth
- A lack of nitrate ions can stunt plant growth
Magnesium Ions
- Magnesium ions help synthesise chlorophyll
- Chlorophyll absorbs light energy during photosynthesis
- Magnesium ion deficiency causes leaves to turn yellow (chlorosis) because they cannot photosynthesise properly
Symptoms of plant disease include:
- Stunted growth, typically due to nitrate ion deficiency
- Spotted leaves, as seen with rose black spot fungus
- Decay and rotting
- Unusual growths
- Stem and leaf malformation
- Discolouration
- Presence of pests
Plant disease identification:
- Use of gardening websites or manuals
- Laboratory testing can confirm diseases
- Monoclonal antibody test kits give specific diagnoses
Physical Defence Responses
- Plants defend via cellulose cell walls
- Tough waxy cuticles are employed on leaves
- Outer layers on stems or bark on trees provide defense
- Leaf fall sheds potential disease sites
Chemical Defence Reponses
- Plants generate antibacterial chemicals
- Plants create poisons
Mechanical Defence Reponses
- Plants use thorns and hairs to deter animals
- Plants have leaves that droop or curl on contact
- Plants use mimicry to trick animals
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Description
Learn about plant diseases in AQA Biology GCSE 3.3. Aphids weaken plants and spread pathogens, while nutrient deficiencies like nitrate and magnesium affect growth and chlorophyll production. Recognizing disease symptoms such as stunted growth, spots, and discoloration is crucial for plant health.
