2. a structure in plants that transports food

3. a condition of plant cells in which the cell has lost water to an extent that the cell membrane is not touching the cell wall

4. an apparatus for measuring the rate of water uptake by shoots

5. long tubular structures in root hair cells for absorbing water

6. special structures in leaves and green stems for controlling the entry and loss of water vapour

7. the loss of water vapour from the surfaces of plants due to evaporation

8. a pulling force that pulls water up the xylem vessels of stems due to transpiration

9. tissues in plants that transport materials

10. structure in plants for transporting water

11. tubes of dead xylem cells running continuously from the roots through the stem to the leaves

12. the point at wich the rate of photosynthesis is equal to the rate of respiration, and at which no net gas exchange occurs

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