Class 9 Biology · Chapter 9 · Test 4
Water and Food Transport
23 MCQs • Practice transpirational pull, water transport through xylem, cohesion and adhesion, phloem transport, sources, sinks, and the Pressure Flow Mechanism.
23 questions · 20 min · 23 marks
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Sample questions
The first 5 of 23. Try each one, then tap to see the answer.
Question 1
What creates the pulling force that moves water in plants?
- ATranspiration
- BPhotosynthesis
- CGuttation
- DFood translocation
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Answer: A
The pulling force in leaves is created by the transpiration of water from their surfaces.
Question 2
What is the pulling force created by transpiration called?
- ATranspirational pull
- BPressure flow
- CActive transport
- DDiffusion
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Answer: A
The pulling force created in leaves by transpiration is called transpirational pull.
Question 3
What happens when mesophyll cells of a leaf lose water?
- AMore water enters them from the xylem
- BThey stop receiving water
- CFood enters from phloem
- DWater leaves the xylem
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Answer: A
When mesophyll cells lose water, more water enters them from the xylem vessels.
Question 4
What is present continuously from leaves to roots inside xylem vessels?
- AA water column
- BA food column
- CA sugar column
- DA gas column
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Answer: A
The text states that there is a continuous water column inside xylem vessels extending from leaves to stem and roots.
Question 5
Which three factors help create the continuous water column in xylem?
- ACohesion narrow xylem vessels and adhesion
- BPhotosynthesis respiration and guttation
- CDiffusion osmosis and active transport
- DStomata guard cells and chloroplasts
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Answer: A
The continuous water column is created by attraction among water molecules, narrow xylem vessels, and adhesion of water molecules to xylem walls.
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