About this Study Set
This study set covers Horticulture through
20 practice questions.
A rigorous examination of plant physiology, propagation, and soil chemistry. Every question includes the correct answer so you can learn as you go — pick any format above to get started.
Questions & Answers
Browse all 20 questions from the
Advanced Horticultural Science study set below.
Each question shows the correct answer — select a study format above to practice interactively.
1
Which phytohormone is primarily responsible for the induction of stomatal closure in response to water stress?
-
A
Auxin
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B
Gibberellin
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C
Abscisic acid
-
D
Cytokinin
2
What is the precise term for the process where plants convert atmospheric nitrogen into ammonium by the enzyme nitrogenase in symbiotic relationships?
-
A
Nitrification
-
B
Denitrification
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C
Nitrogen fixation
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D
Ammonification
3
In plant tissue culture, which plant growth regulator ratio typically promotes root organogenesis over shoot formation?
-
A
High auxin to low cytokinin
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B
High cytokinin to low auxin
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C
Equal concentrations of auxin and cytokinin
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D
High gibberellin to low auxin
4
The 'crassulacean acid metabolism' (CAM) pathway is a physiological adaptation primarily designed to maximize which efficiency?
-
A
Photosynthetic photon flux density
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B
Water-use efficiency
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C
Nitrogen uptake
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D
Respiration rate
5
What is the function of the Casparian strip in the primary root endodermis?
-
A
Providing structural support to xylem vessels
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B
Facilitating symplastic transport of nutrients
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C
Preventing apoplastic flow into the vascular cylinder
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D
Synthesizing secondary metabolites
6
Which mineral element is a core component of the chlorophyll molecule's porphyrin ring?
-
A
Iron
-
B
Magnesium
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C
Manganese
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D
Copper
7
What defines the phenomenon of 'apical dominance' in plants?
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A
The inhibition of lateral bud growth by the shoot apex
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B
The rapid vertical growth of roots over shoots
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C
The dominance of flower production over vegetative growth
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D
The preferential allocation of sugar to the fruit
8
Which specialized type of cell division leads to the formation of the vascular cambium in woody perennials?
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A
Periclinal division
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B
Anticlinal division
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C
Meiosis
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D
Endoreduplication
9
What is the primary mechanism of action for the herbicide Glyphosate?
-
A
Inhibition of photosystem II
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B
Inhibition of the EPSP synthase enzyme
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C
Disruption of microtubule assembly
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D
Induction of ethylene production
10
Which wavelength range of light is most effectively absorbed by chlorophyll pigments during photosynthesis?
-
A
500-550 nm (Green)
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B
600-700 nm (Red)
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C
750-850 nm (Far-red)
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D
300-350 nm (UV)
11
What is the term for the movement of phloem sap from 'source' tissues to 'sink' tissues, as described by the Münch pressure-flow hypothesis?
-
A
Translocation
-
B
Transpiration
-
C
Diffusion
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D
Imbibition
12
In soil science, what is the 'cation exchange capacity' (CEC) a measure of?
-
A
The total water-holding capacity
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B
The soil's ability to retain and exchange positively charged nutrients
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C
The concentration of hydrogen ions in the soil solution
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D
The total carbon content of the soil
13
Which type of pathogen causes 'damping-off' disease in seedlings, characterized by the decay of the stem near the soil line?
-
A
Oomycetes (e.g., Pythium)
-
B
Viruses (e.g., TMV)
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C
Nematodes
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D
Bacteria
14
What is the role of vernalization in plant development?
-
A
Inducing flowering through exposure to cold temperatures
-
B
Accelerating seed germination through desiccation
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C
Enhancing fruit ripening through ethylene release
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D
Increasing secondary root density through pruning
15
Which plant pigment is responsible for perceiving the red/far-red light ratio, thereby regulating shade avoidance responses?
-
A
Carotenoid
-
B
Phytochrome
-
C
Anthocyanin
-
D
Flavonoid
16
What is the primary role of the 'S-locus' in many flowering plants?
-
A
Determining fruit color
-
B
Regulating self-incompatibility
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C
Controlling flower scent
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D
Increasing pollen tube growth speed
17
In plant propagation, what is a 'chimera' specifically defined as?
-
A
A plant with two or more genetically distinct cell layers
-
B
A hybrid cross between two different genera
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C
A genetically modified organism containing foreign DNA
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D
A mutant lacking chlorophyll in all cells
18
Which nutrient deficiency typically manifests as interveinal chlorosis on older leaves first?
-
A
Calcium
-
B
Nitrogen
-
C
Iron
-
D
Boron
19
What is the scientific term for the loss of water vapor through the stomata of plant leaves?
-
A
Guttation
-
B
Transpiration
-
C
Evaporation
-
D
Respiration
20
Which anatomical feature allows for gas exchange in the periderm of woody stems?
-
A
Stomata
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B
Lenticels
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C
Hydathodes
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D
Trichomes
