Which statements about the apoplast and symplast pathways are correct? 1 In the apoplast pathway, water molecules move through free spaces in the cellulose cell walls of plant roots. 2 In the symplast pathway, water molecules diffuse through the cytoplasm and plasmodesmata of cells. 3 Water molecules travelling through plant tissue move by mass flow along the apoplast pathway. 4 The Casparian strip blocks the symplast pathway and forces all water molecules to enter the cytoplasm of endodermis cells.

\(1,2,3\) and 4

1,2 and 3 only

1 and 2 only

3 and 4 only

Biology

IGCSE&ALevel

CAIE

Exam No：9700_s23_qp_12 Year：2023 Question No：27

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

Answer:

Knowledge points:

Solution:

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