PHA 048 - LAS 8 QUIZ
Question 1
A drought-resistant plant has high mucilage content in its tissues. What adaptive advantage does this provide?
It enhances photosynthetic rate.
It helps retain moisture and prevents dehydration.
It increases pigment concentration.
It reduces the plant’s carbohydrate stores.
Question 2
During extraction, mucilage turns slimy when warm water is added. What does this change indicate about its chemical structure?
It contains hydrophobic lipid chains.
It is made up of hydrophilic polysaccharides.
It reacts with proteins to form enzymes.
It forms insoluble precipitates in water.
Question 3
If carotenoids were absent in green plants, which process would be most affected?
Absorption of excess light energy for photosynthesis.
Water transport through xylem.
Seed germination and nutrient uptake.
Nitrogen fixation in roots.
Question 4
A pharmacist wants to create a natural cough syrup using plant extracts. Which property of mucilage makes it useful in this formulation?
Its ability to reduce oxidation.
Its ability to form a soothing protective layer on tissues.
Its role in enhancing pigment absorption.
Its function in promoting enzymatic breakdown.
Question 5
In an extraction test, a student uses water for carotenoids and finds no color change. Which concept explains this?
Carotenoids are polar molecules that need acidic media.
Carotenoids are fat-soluble and require a nonpolar solvent.
Carotenoids are proteins that denature in water.
Water reacts with carotenoids to make them colorless.
Question 6
How does the slimy texture of Hibiscus mucilage demonstrate its pharmaceutical potential?
It shows low molecular weight and fast diffusion.
It suggests a high water-binding capacity ideal for suspending agents.
It proves mucilage is a volatile organic compound.
It indicates the presence of insoluble pigments.
Question 7
If a plant with abundant carotenoids is exposed to intense sunlight, what will most likely occur?
The plant will suffer oxidative damage.
The carotenoids will absorb excess light and protect chlorophyll.
The plant will lose its color due to pigment breakdown.
The chlorophyll will outcompete carotenoids for energy absorption.
Question 8
Why are mucilage and carotenoids both considered vital in linking botany and pharmacy?
They illustrate plant functions that have direct medicinal applications.
They both act as enzymes in drug metabolism.
They are synthetic compounds replicated in laboratories.
They exist only in ornamental species.
Question 9
If mucilage were replaced with a non-gel-forming carbohydrate, what effect might this have on a plant’s ecology?
The plant would lose its ability to retain water and resist stress.
The plant would photosynthesize more efficiently.
Pollination rates would increase.
The color of the flowers would intensify.
Question 10
A pharmaceutical researcher wants to use carotenoids in a supplement. Why must the formulation include fat or oil?
Carotenoids are hydrophilic and dissolve in water.
Carotenoids are unstable in nonpolar solvents.
Carotenoids are fat-soluble and require lipids for absorption.
Fats increase the flavor and color intensity of carotenoids.
Question 11
If mucilage is extracted using cold water instead of warm water, the yield decreases. What could explain this observation?
Cold water destroys polysaccharides.
Warm water increases solubility and swelling of mucilage molecules.
Cold water converts mucilage into starch.
Warm water deactivates the compound.
Question 12
Carotenoids act as antioxidants in plants and humans. What structural feature allows this function?
Alternating double bonds that neutralize free radicals.
High sugar content that stores energy.
Peptide chains that bind oxygen.
Hydrophilic regions that attract water.
Question 13
A pharmacist substitutes Hibiscus mucilage with a synthetic polymer in a formulation. Which ethical or practical issue might arise?
Synthetic polymers may not be biodegradable or biocompatible.
Synthetic materials always perform better than natural ones.
Natural mucilage cannot be standardized for use.
Plant mucilage is too toxic for pharmaceutical use.
Question 14
Which statement best explains the connection between chemical structure and biological role for these compounds?
Mucilage’s hydrophilic nature allows water binding; carotenoids’ conjugated bonds absorb light.
Both are proteins that catalyze plant metabolism.
Mucilage’s nonpolar structure repels water; carotenoids’ simple sugars store energy.
Both are inorganic pigments that aid mineral absorption.
Question 15
Why can carotenoids be considered an evolutionary advantage for flowering plants?
They attract pollinators through bright coloration and protect against light stress.
They increase plant size and height.
They allow water absorption in roots.
They strengthen seed coats chemically