biology : class11 Imbibant and Imbibate : Definition, Mechanism, Examples, Importance : Imbibition MCQ Questions and Answers
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Imbibant and Imbibate
MCQ questions and answers.
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MCQ Questions
1. In the imbibition of a dry seed, which pairing correctly identifies the imbibant and the imbibate?
A.
Water is the imbibant and seed proteins are the imbibate
B.
Seed proteins and cell-wall polysaccharides are the imbibants and water is the imbibate
C.
The seed coat is the imbibate and water is the imbibant
D.
Dissolved minerals are the imbibants and cellulose is the imbibate
Correct Answer:
Seed proteins and cell-wall polysaccharides are the imbibants and water is the imbibate
Explanation:
The imbibant is the hydrophilic solid material that attracts and holds liquid, whereas the imbibate is the liquid absorbed. In a dry seed, proteins and cell-wall polysaccharides act as imbibants and water acts as the imbibate.
2. Which property most directly allows a substance to function as an imbibant?
A.
High affinity for the imbibate due to numerous hydrophilic groups
B.
Complete absence of surface charges
C.
Ability to dissolve instantly in the imbibate
D.
A permanently hydrophobic molecular surface
Correct Answer:
High affinity for the imbibate due to numerous hydrophilic groups
Explanation:
An imbibant must have an affinity for the imbibate. Hydrophilic groups in substances such as cellulose, pectin, and proteins attract and hold water molecules, enabling imbibition.
3. A dry gelatin cube absorbs water and increases markedly in volume. In this system, gelatin and water are respectively the:
A.
Imbibate and imbibant
B.
Solute and solvent
C.
Imbibant and imbibate
D.
Adsorbate and adsorbent
Correct Answer:
Imbibant and imbibate
Explanation:
Gelatin is a hydrophilic solid that takes up water, so it is the imbibant. The water taken up by gelatin is the imbibate.
4. Why is a dry plant cell wall classified as an imbibant when it absorbs water?
A.
It acts as a hydrophilic solid matrix that binds the absorbed water
B.
It chemically converts water into a gas
C.
It serves as the liquid phase entering the seed
D.
It prevents any interaction between water and cellulose
Correct Answer:
It acts as a hydrophilic solid matrix that binds the absorbed water
Explanation:
Cell-wall components such as cellulose, hemicellulose, and pectin contain hydrophilic sites. They form the solid imbibant matrix and hold the water that enters as the imbibate.
5. A researcher replaces water surrounding a dry starch sample with a nonpolar liquid that has little affinity for starch. Which outcome is most likely?
A.
The nonpolar liquid will act as a stronger imbibate than water
B.
Starch will imbibe the liquid extensively because all liquids behave identically
C.
Limited imbibition will occur because the imbibant–imbibate affinity is low
D.
Starch will become the imbibate while the liquid becomes the imbibant
Correct Answer:
Limited imbibition will occur because the imbibant–imbibate affinity is low
Explanation:
Imbibition depends on attraction between the imbibant and imbibate. Starch is hydrophilic and has much greater affinity for water than for a nonpolar liquid, so uptake of the latter is limited.
6. During seed hydration, which change best indicates that water is functioning as an imbibate rather than merely being present externally?
A.
Water remains separated from the seed surface without entering it
B.
Water becomes associated with hydrophilic seed polymers and the seed swells
C.
Water evaporates before contacting seed polymers
D.
Water replaces all solid seed constituents
Correct Answer:
Water becomes associated with hydrophilic seed polymers and the seed swells
Explanation:
Water is an imbibate when it is taken up and held by hydrophilic solid constituents of the seed. Its association with proteins and cell-wall materials commonly produces swelling.
7. Which statement correctly distinguishes an imbibant from an imbibate in a plant-based example?
A.
The imbibant is always gaseous, whereas the imbibate is always solid
B.
The imbibant is the absorbing hydrophilic solid, whereas the imbibate is the liquid absorbed
C.
The imbibant is the liquid that causes swelling, whereas the imbibate is the solid swollen
D.
The two terms are interchangeable because both refer to absorbed water
Correct Answer:
The imbibant is the absorbing hydrophilic solid, whereas the imbibate is the liquid absorbed
Explanation:
The terms identify different components of imbibition. The imbibant is the hydrophilic solid material, while the imbibate is the liquid that enters and is retained by that material.
8. A dry seed contains cellulose, pectin, and storage proteins. If water is supplied, which component is most accurately described as the imbibate?
A.
Cellulose
B.
Pectin
C.
Storage protein
D.
Water
Correct Answer:
Water
Explanation:
Cellulose, pectin, and storage proteins are solid hydrophilic constituents that can serve as imbibants. The water absorbed by them is the imbibate.
9. If a hydrophilic polymer is chemically modified so that its affinity for water is greatly reduced, what change in its role is expected?
A.
It will remain an equally effective imbibant because imbibition is independent of affinity
B.
It will become the imbibate automatically
C.
Its capacity to function as an imbibant will decrease
D.
It will convert water into a new imbibant
Correct Answer:
Its capacity to function as an imbibant will decrease
Explanation:
The effectiveness of an imbibant depends strongly on its affinity for the imbibate. Reducing a polymer's hydrophilic character lowers its ability to attract and retain water.
10. A dry seed absorbs water, but a nonaqueous liquid is not absorbed appreciably under identical conditions. Which conclusion is best supported?
A.
The seed constituents act as imbibants with greater affinity for water than for the nonaqueous liquid
B.
The nonaqueous liquid is a stronger imbibate because it causes less swelling
C.
The seed constituents are imbibates and water is an imbibant
D.
Imbibition does not depend on the chemical nature of the liquid
Correct Answer:
The seed constituents act as imbibants with greater affinity for water than for the nonaqueous liquid
Explanation:
The selective uptake indicates that the seed's hydrophilic solid constituents are imbibants with a stronger affinity for water. Water therefore functions effectively as the imbibate in this example.
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