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Science 10 Assignment 3.8 (29 marks)
1. What are the properties of water that aid in water transport in plants? (1 mark)
Water enters through the root hairs.
2. Explain how the vacuoles of a plant cell are affected when the cell is placed in a
hypertonic solution and in a hypotonic solution? (4 marks)
Hypertonic solution- describes a solution with a higher solute concentration compared with
another solution
Hypotonic solution- describes a solution with a lower solute concentration compared with
another solution.
3. Water loss could be a danger to the survival of the plant. Explain the control
mechanism the plant uses to reduce water loss. (2 marks)
The cohesion of water molecules to one another due hydrogen bond formation
By adhesion of water molecules to the walls of the xylem cells which aids in offsetting the
downward pull of gravity.
4. What are the two types of plant vascular tissues? What is the function of each? (4
marks)
Xylem cells- tend to conduct water and minerals from the leaves
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Phloem cells- conduct food from leaves to the rest of the plant.
5. Suggest a role for turgidity in photosynthesis. (2 marks)
Turgidity helps non-woody plants stand upright, and is also important in regulating the
opening of stomata for photosynthesis and respiration.
6. Describe the processes involved in the movement of water from the roots to the leaves.
(2 marks)
Water moves into the roots to form soil by osmosis and enters the xylem vessels. By
adhesive and cohesive properties of water molecules, water moves up the xylem.
Transpiration pulls from the leaf pulls water up the xylem to the leaves to replace the
water lost by transpiration and this water is used for photosynthesis.
7. Explain how sugars from photosynthesis are transported from the leaves to other parts
of a plant. (3 marks)
Using hypertonic, isotonic, and hypotonic
8. Define the following terms. (4 marks)
Diffusion- spontaneous movement of particles from an area of higher concentration to an
area of lower concentration.
Osmosis- diffusion of water across a selectively permeable membrane
Active transport-movement of molecules or ions across a membrane against a
concentration gradient; requires energy form ATP
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Transpiration-loss of water from leaves through evaporation
Transport in Plants (7 marks)
Identify the structures that make up the shoot and root systems, and the processes occurring in each
structure that are responsible for transport in the plant.
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Copyright © 2004 Pearson Education Canada Inc.