PHA 048 - LAS 9 QUIZ
Question 1
A plant placed near a window bends toward the sunlight over several days. Which process and hormone best explain this phenomenon?
Geotropism and gibberellin
Phototropism and auxin
Hydrotropism and ethylene
Chemotropism and cytokinin
Question 2
A farmer wants to increase the size of seedless grapes. Which plant hormone should be applied to achieve this effect?
Gibberellin
Auxin
Cytokinin
Abscisic acid
Question 3
If a flower’s stigma is damaged, what direct consequence will most likely occur?
The pollen tube will fail to form, preventing fertilization.
The ovary will continue seed formation.
The plant will undergo vegetative propagation.
Pollination will continue normally.
Question 4
Two plants are grown under identical conditions, but one receives vinegar solution while the other receives banana extract. After five days, the banana-treated plant grows taller. What does this imply about the hormone effects?
Gibberellins promote cell elongation, while vinegar inhibits auxins.
Auxins enhance seed germination, while vinegar increases gibberellins.
Vinegar enhances growth by lowering pH.
Banana extract inhibits plant hormones.
Question 5
Why is understanding pollination and fertilization essential in developing hybrid crop varieties?
It allows selective breeding for desired traits.
It increases the production of nectar.
It prevents seed dispersal in wild species.
It reduces the need for photosynthesis.
Question 6
If a plant species lacks viable pollen, which reproductive process would be most affected?
Pollination
Fertilization
Germination
Photosynthesis
Question 7
A scientist discovers a plant that germinates even in low temperature and light. Which hormonal characteristic might explain this?
Increased gibberellin activity breaking seed dormancy
Reduced auxin levels limiting elongation
High abscisic acid levels maintaining dormancy
Ethylene accumulation causing stress response
Question 8
In tissue culture, adding auxins to the growth medium mainly stimulates:
Root formation and cell elongation
Fruit ripening
Leaf senescence
Stomatal closure
Question 9
A botanist observes that flower A has a long style and short stamen, while flower B has the opposite. What adaptive advantage might this provide?
Prevents self-pollination and promotes genetic diversity.
Increases self-fertilization efficiency.
Enhances pollen production.
Reduces attraction of pollinators.
Question 10
If gibberellin production is genetically suppressed in a plant, which result is most likely?
Dwarfism and delayed germination
Increased fruit formation
Early flowering
Enhanced stem elongation
Question 11
A researcher notes that mung beans treated with vinegar solution have shorter shoots. What conclusion can be drawn from this observation?
Auxin activity was inhibited, reducing cell elongation.
Gibberellin concentration increased.
Vinegar enhanced root growth.
Water acted as a growth stimulant.
Question 12
How does the interaction between auxins and gibberellins demonstrate hormonal balance in plants?
They coordinate growth responses to internal and external stimuli.
They perform identical functions in different organs.
They act independently without affecting each other.
They inhibit photosynthesis during dormancy.
Question 13
Why is the study of plant hormones valuable in pharmacy and biotechnology?
It aids in controlling plant growth for drug-producing species.
It limits natural compound formation.
It promotes only ornamental plant growth.
It prevents medicinal plant propagation.
Question 14
In the context of seed germination, what is the primary significance of hormonal regulation?
Ensures the seed only grows under favorable environmental conditions.
Prevents the seed from absorbing water too quickly.
Increases seed coat thickness.
Blocks oxygen intake until flowering.
Question 15
The connection between botany and pharmacy in studying plant hormones is best illustrated by which example?
Using auxins and gibberellins to enhance metabolite production in medicinal plants.
Analyzing soil nutrients for crop rotation.
Creating fertilizers for ornamental plants.
Observing leaf color changes during autumn.