J 1 is a slide of a stained transverse section through a leaf. Draw a large plan diagram of the region of the leaf on J1 indicated by the shaded area in Fig. 2.1. Use a sharp pencil. Use one ruled label line and label to identify the lower epidermis. Fig. 2.1 (ii) Observe the xylem vessel elements in the leaf on J1. Select a line of four adjacent xylem vessel elements. Each xylem vessel element must touch at least one other xylem vessel element. - Make a large drawing of this line of four xylem vessel elements. - Use one ruled label line and label to identify the wall of one xylem vessel element.

Biology

IGCSE&ALevel

CAIE

Exam No：9700_w24_qp_3 Year：2024 Question No：2(a)

Answer:

Knowledge points:

1.1.1 Candidates should be able to:make temporary preparations of cellular material suitable for viewing with a light microscope

1.1.2 Candidates should be able to:draw cells from microscope slides and photomicrographs

1.1.3 Candidates should be able to:calculate magnifications of images and actual sizes of specimens from drawings, photomicrographs and electron micrographs (scanning and transmission)

1.1.4 Candidates should be able to: use an eyepiece graticule and stage micrometer scale to make measurements and use the appropriate units, millimetre (mm), micrometre (µm) and nanometre (nm)

1.1.5 Candidates should be able to: define resolution and magnification and explain the differences between these terms, with reference to light microscopy and electron microscopy

Answer:

Knowledge points:

Solution:

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