$$$ \mathrm{~K} 1$$$ is a slide of a stained transverse section through a plant root. Observe the xylem vessel elements in the root on $$$\mathrm{K} 1$$$. Select a group of four adjacent xylem vessel elements. Each xylem vessel element must touch at least two other xylem vessel elements. - Make a large drawing of this group of four xylem vessel elements. - Use one ruled label line and label to identify the cell wall of one xylem vessel element.

Biology

IGCSE&ALevel

CAIE

Exam No：9700_s23_qp_32 Year：2023 Question No：2(a)(ii)

Answer:

1 minimum size and all lines sharp and continuous and no shading ;
2 draws only four whole xylem vessel elements and each xylem vessel element touches at least two other xylem vessel elements ;
3 two lines around each xylem vessel element and three lines where xylem vessel elements touch ;
4 correct shape of xylem vessel elements ;
5 label line and label to one cell wall ;

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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