biology : class11 Mechanical Force : Definition, Mechanism, Examples, Importance : Imbibition MCQ Questions and Answers
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Mechanical Force
MCQ questions and answers.
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MCQ Questions
1. The pressure developed by swelling imbibing materials is called:
A.
Osmotic pressure
B.
Imbibition pressure
C.
Turgor pressure
D.
Root pressure
Correct Answer:
Imbibition pressure
Explanation:
Imbibing substances such as dry seeds develop pressure as they absorb water and swell. This pressure is called imbibition pressure.
2. Which mechanical effect can occur when dry seeds imbibe water?
A.
The seed coat may break
B.
The seed loses all its cells
C.
The seed becomes permanently dry
D.
The seed stops increasing in size
Correct Answer:
The seed coat may break
Explanation:
Water absorption causes the seed tissues to swell, producing mechanical force that may crack or break the seed coat.
3. The swelling of dry wooden doors during rainy weather is mainly due to:
A.
Water loss
B.
Imbibition
C.
Respiration
D.
Transpiration
Correct Answer:
Imbibition
Explanation:
Wood contains hydrophilic substances that absorb water and swell. This swelling can exert mechanical force and make doors difficult to close.
4. Which material can exert mechanical force after absorbing water by imbibition?
A.
Dry wood
B.
Glass
C.
Metal foil
D.
Plastic sheet
Correct Answer:
Dry wood
Explanation:
Dry wood has hydrophilic cell wall materials that imbibe water, swell, and exert mechanical force.
5. When a dry seed swells after absorbing water, the force produced is mainly due to:
A.
Shrinkage of seed tissues
B.
Expansion of imbibing substances
C.
Movement of sugars out of the seed
D.
Loss of minerals from the seed
Correct Answer:
Expansion of imbibing substances
Explanation:
Imbibing substances expand as they take up water. Their expansion generates mechanical force within the seed.
6. Which observation demonstrates the mechanical force of imbibition?
A.
A seed coat splitting as the seed swells
B.
A leaf producing food in sunlight
C.
A flower producing scent
D.
A root absorbing minerals without swelling
Correct Answer:
A seed coat splitting as the seed swells
Explanation:
The swelling of a water-absorbing seed can produce enough mechanical force to split its covering.
7. The mechanical force of imbibition is produced when imbibing substances:
A.
Absorb water and swell
B.
Release water and shrink
C.
Absorb oxygen and dissolve
D.
Release minerals and harden
Correct Answer:
Absorb water and swell
Explanation:
Water enters hydrophilic substances during imbibition, causing them to expand and generate mechanical force.
8. Why can imbibition help a germinating seed emerge from its covering?
A.
Swelling creates pressure that can rupture the covering
B.
Swelling removes all water from the covering
C.
Imbibition prevents the seed from increasing in size
D.
Imbibition changes the seed into a non-living structure
Correct Answer:
Swelling creates pressure that can rupture the covering
Explanation:
As the seed imbibes water, its tissues swell and exert mechanical pressure that may rupture the seed coat.
9. Which statement about the mechanical force of imbibition is correct?
A.
It results from the swelling of water-absorbing materials
B.
It results only from evaporation of water
C.
It is produced only by green leaves
D.
It occurs when materials lose their ability to absorb water
Correct Answer:
It results from the swelling of water-absorbing materials
Explanation:
The mechanical force develops because hydrophilic materials take up water and increase in volume.
10. A dry seed placed in water becomes larger and may push against its seed coat. This pushing force is due to:
A.
Imbibitional swelling
B.
Transpirational pull
C.
Photosynthetic pressure
D.
Mineral diffusion
Correct Answer:
Imbibitional swelling
Explanation:
Water absorption by the seed's hydrophilic components causes swelling, which produces the pushing mechanical force.
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