Lesson 5.1.5a
5.1.5a Plant responses and plant hormones Quiz: OCR Biology, Unit 5
20 questions
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Lesson 5.1.5a, Plant responses and plant hormones: 20 multiple choice questions for the OCR Biology (H020), Unit 5: Communication and homeostasis, written with Revision Ninja.
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The 20 questions
-
Which term describes a directional growth response of a plant to light?
- Phototropism
- Geotropism
- Thigmonasty
- Chemotaxis
-
Which tropism describes the downward growth of roots in response to gravity?
- Chemotropism towards sugars
- Positive thigmotropism
- Negative phototropism
- Positive geotropism
-
Which plant hormone is primarily responsible for maintaining apical dominance?
- Auxin
- Gibberellin
- Ethene
- Abscisic acid
-
How does auxin produced in the apical bud affect lateral buds?
- Promotes division
- Triggers abscission
- Stimulates elongation
- Inhibits growth
-
Which plant hormone promotes stem elongation and breaks seed dormancy to trigger germination?
- Ethene
- Abscisic acid
- Gibberellin
- Cytokinin
-
Which plant hormone triggers stomatal closure during water stress?
- Auxin
- Abscisic acid
- Gibberellin
- Ethene
-
What experimental procedure demonstrates that the apical bud inhibits lateral bud growth?
- Covering stem base
- Removing shoot tip
- Shading lower leaves
- Watering root system
-
Where does auxin accumulate when a plant shoot is exposed to unilateral light?
- Root tip
- Vascular bundle
- Shaded side
- Illuminated side
-
What is the main effect of applying synthetic auxin rooting powder to stem cuttings?
- Stimulates root growth
- Prevents leaf drop
- Inhibits cell division
- Accelerates fruit ripening
-
Why do synthetic auxin weedkillers selectively target broadleaved weeds instead of narrow-leaved grasses?
- Higher auxin sensitivity
- Absence of stomata
- Faster photosynthesis rate
- Thicker leaf cuticle
-
What effect does applying gibberellin to dormant seeds typically have?
- Prevents amylase production
- Stimulates seed germination
- Inhibits root growth
- Induces stomatal closure
-
Which gas is commercially applied to green fruit to promote uniform ripening?
- Carbon dioxide
- Oxygen
- Ethene
- Methane
-
What is the main purpose of performing a serial dilution of a plant hormone?
- Increase hormone purity
- Produce known concentrations
- Prevent chemical breakdown
- Maintain constant pH
-
Which variable must be controlled when investigating the effect of gibberellin on stem elongation?
- Temperature
- Final stem height
- Gibberellin concentration
- Stem length change
-
Which plant process is directly inhibited by high concentrations of auxin in the apical bud?
- Leaf abscission
- Root cell division
- Lateral bud growth
- Stem elongation
-
What is the purpose of a control placed in uniform light during phototropism experiments?
- Maximise photosynthesis rate
- Inhibit stem growth
- Confirm directional response
- Destroy plant auxins
-
Which compounds are described in the specification as chemical defences against herbivory?
- Chlorophyll and carotenoids
- Insulin and glucagon
- Alkaloids and pheromones
- Starch and cellulose
-
What type of rapid response is shown when a Mimosa pudica leaf folds upon touch?
- Thigmotropism
- Geotropism
- Nastic response
- Phototropism
-
Which plant hormone primarily stimulates stem elongation and seed germination?
- Abscisic acid
- Auxin
- Gibberellin
- Ethene
-
Which plant hormone accumulates in sealed packaging to accelerate fruit ripening?
- Auxin
- Cytokinin
- Ethene
- Gibberellin
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