Fig. 2.1 Fig. 2.2 Plan an investigation to determine the effect of temperature on the rate of movement of a coloured dye through celery stalks. ...................................................................................................................................................... . ...................................................................................................................................................... . ...................................................................................................................................................... . ...................................................................................................................................................... . ...................................................................................................................................................... . ...................................................................................................................................................... . ...................................................................................................................................................... . ...................................................................................................................................................... . ...................................................................................................................................................... . ...................................................................................................................................................... . ...................................................................................................................................................... . ...................................................................................................................................................... . .................................................................................................................................................

Biology

IGCSE&ALevel

CAIE

Exam No：0610_w24_qp_51 Year：2024 Question No：2

Answer:

Knowledge points:

8.1.1 State the functions of xylem and phloem

8.1.2 Identify the position of xylem and phloem as seen in sections of roots, stems and leaves, limited to non-woody dicotyledonous plants

8.3.1 State that water is transported from the roots to leaves through the xylem vessels

8.3.2 Define transpiration as loss of water vapour from plant leaves by evaporation of water at the surfaces of the mesophyll cells followed by diffusion of water vapour through the stomata

8.3.3 Investigate and describe the effects of variation of temperature and humidity on transpiration rate

8.3.4 Explain how water vapour loss is related to the large surface area of cell surfaces, interconnecting air spaces and stomata

8.3.5 Explain the mechanism by which water moves upwards in the xylem in terms of a transpiration pull that draws up a column of water molecules, held together by cohesion

8.3.6 Explain how and why wilting occurs

8.3.7 Explain the effects of variation of temperature and humidity on transpiration rate

Answer:

Knowledge points:

Solution:

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