1. What are imbibants?
A.
Substances that absorb water and swell
B.
Substances that repel water
C.
Substances that produce chlorophyll
D.
Substances that release oxygen
Correct Answer:
Substances that absorb water and swell
Explanation:
Imbibants are hydrophilic substances that absorb water and usually increase in volume or swell.
2. Which of the following is a common plant imbibant?
A.
Cellulose
B.
Chlorophyll
C.
Wax
D.
Cutin
Correct Answer:
Cellulose
Explanation:
Cellulose has an affinity for water and can absorb it by imbibition, so it acts as an imbibant.
3. Which substance in a dry seed can act as an imbibant?
A.
Proteins
B.
Oxygen
C.
Carbon dioxide
D.
Mineral oil
Correct Answer:
Proteins
Explanation:
Seed proteins are hydrophilic and absorb water during imbibition.
4. Which of the following materials can absorb water by imbibition?
A.
Dry wood
B.
Glass
C.
Polythene
D.
Aluminium foil
Correct Answer:
Dry wood
Explanation:
Dry wood contains hydrophilic cell-wall materials such as cellulose, which act as imbibants.
5. The ability of an imbibant to absorb water mainly depends on its:
A.
Affinity for water
B.
Colour
C.
Temperature alone
D.
Ability to reflect light
Correct Answer:
Affinity for water
Explanation:
Imbibants absorb water because their hydrophilic substances have a strong attraction or affinity for water.
6. Which of the following is a hydrophilic imbibant?
A.
Starch
B.
Paraffin wax
C.
Petroleum jelly
D.
Grease
Correct Answer:
Starch
Explanation:
Starch is hydrophilic and can take up water, making it an imbibant.
7. A dry seed swells when placed in water because its imbibants:
A.
Absorb water
B.
Produce water
C.
Evaporate water
D.
Convert water into oxygen
Correct Answer:
Absorb water
Explanation:
Hydrophilic components such as proteins and starch in the seed absorb water and cause the seed to swell.
8. Which group contains only substances that can act as imbibants?
A.
Cellulose, starch and proteins
B.
Wax, grease and oil
C.
Glass, plastic and metal
D.
Oxygen, nitrogen and carbon dioxide
Correct Answer:
Cellulose, starch and proteins
Explanation:
Cellulose, starch and proteins are hydrophilic substances that can absorb water by imbibition.
9. Which property is common to most imbibants?
A.
They are hydrophilic
B.
They are always gases
C.
They are always waterproof
D.
They cannot interact with water
Correct Answer:
They are hydrophilic
Explanation:
Most imbibants are hydrophilic, meaning they have an attraction for and can absorb water.
10. Which plant material acts as an imbibant and swells on absorbing water?
A.
Dry seed coat
B.
Leaf wax
C.
Cuticle oil
D.
Resin
Correct Answer:
Dry seed coat
Explanation:
The seed coat contains hydrophilic materials that absorb water and swell during imbibition.
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