What is a definition of transpiration?

the evaporation of water vapour from a leaf due to the diffusion of water from an area of low water potential to high water potential

the loss of water vapour from a plant to its environment by diffusion down a water potential gradient

the movement of water from root to leaf due to the adhesion of water molecules to one another

the uptake of water by plant roots by movement of water down a continuous water potential gradient from air to soil

Biology

IGCSE&ALevel

CAIE

Exam No：9700_w19_qp_12 Year：2019 Question No：26

Answer:

Knowledge points:

7.1.1 draw plan diagrams of transverse sections of stems, roots and leaves of herbaceous dicotyledonous plants from microscope slides and photomicrographs

7.1.2 describe the distribution of xylem and phloem in transverse sections of stems, roots and leaves of herbaceous dicotyledonous plants

7.1.3 draw and label xylem vessel elements, phloem sieve tube elements and companion cells from microscope slides, photomicrographs and electron micrographs

7.1.4 relate the structure of xylem vessel elements, phloem sieve tube elements and companion cells to their functions

What is a definition of transpiration?

Answer:

Knowledge points:

Solution:

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