Class 11 Biology · Chapter 8 · Test 5
Osmoregulation and Plant Movements
49 MCQs. This part covers osmoregulation in hydrophytes, mesophytes, xerophytes and halophytes, and the adaptations of plants to high and low temperatures. It also covers tropic movements, photoperiodism, phytochrome and vernalisation, along with the related exercise MCQs.
49 questions · 35 min · 49 marks
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Sample questions
The first 5 of 49. Try each one, then tap to see the answer.
Question 1
Osmoregulation refers to maintaining a stable internal equilibrium of:
- AWater and dissolved substances
- BLight and heat
- CGases only
- DProteins only
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Answer: A
Osmoregulation maintains a stable internal equilibrium of water and dissolved substances.
Question 2
A solution with lower solute concentration than the cell is called:
- AHypotonic
- BHypertonic
- CIsotonic
- DSaturated
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Answer: A
A hypotonic solution has reduced solute concentration relative to the cell.
Question 3
In a hypotonic solution water enters the cell causing:
- ASwelling
- BShrinking
- CPlasmolysis
- DNo change
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Answer: A
Water enters by osmosis resulting in swelling.
Question 4
A solution with high solute concentration relative to the cell is:
- AHypertonic
- BHypotonic
- CIsotonic
- DPure water
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Answer: A
A hypertonic solution has high solute concentration relative to the cell.
Question 5
Shrinking of the cell due to loss of water in a hypertonic solution is called:
- APlasmolysis
- BTurgidity
- COsmosis
- DImbibition
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Answer: A
The condition is called plasmolysis.
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