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Question 19M.3.HL.TZ1.2d.i

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.3.HL.TZ1.2d.i
Level HL Paper 3 Time zone TZ1
Command term Label Question number d.i Adapted from N/A
d.i.
[Maximum mark: 1]
19M.3.HL.TZ1.2d.i

Red dye was added to the water in the potometer. A cross section of the stem was observed under the light microscope.

[Source: Nbnidhi, https://commons.wikimedia.org/wiki/File:Transverse_section_of_dicot_stem.jpg]

(d.i)

Label with an R the tissue where the red dye would appear.

[1]

Markscheme

[Source: Nbnidhi, https:// commons.wikimedia.org/wiki/ File:Transverse_section_of_dicot _stem.jpg]

Award [1] for correct labeling of R

Examiners report

This was another question that was difficult for students. This question again required students to understand one of the skills from the subject guide, this time in topic 9.2 (Identification of xylem and phloem in microscope images of stem and root). Student responses to this question, however, suggested that few students could identify phloem and xylem under a microscope.

Syllabus sections