| Date | May 2019 | Marks available | 1 | Reference code | 19M.1.HL.TZ2.40 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 2 |
| Command term | Determine | Question number | 40 | Adapted from | N/A |
Question
What could be used in a technique for measuring flow rates in phloem?
I. Potometers
II. Aphid stylets
III. 14CO2
A. I and II only
B. I and III only
C. II only
D. II and III only
Markscheme
D
Examiners report
This question had a high discrimination index.
Syllabus sections
- 22M.1.HL.TZ2.32: The diagram shows the longitudinal section of phloem tissue at a plant source. What is...
- 18M.2.HL.TZ2.5c: Outline the process used to load organic compounds into phloem sieve tubes.
- 16N.3.HL.TZ0.3a: Describe briefly how scientists obtained leaf phloem sap from the potato plants.
-
18M.1.HL.TZ1.33:
In a plant, what tissue(s) is/are specially adapted to transport sucrose?
- 18N.3.HL.TZ0.2c: Describe the distribution of vascular tissues in the stem of dicotyledonous plants.
-
19M.1.HL.TZ1.33:
The image shows part of a section through the stem of a non-woody plant.
[Source: © Ross Koning. Image used with the kind permission of the author. http://plantphys.info.]
Which feature distinguishes the transport of materials in the tissue labelled I from that in the tissue labelled II?
A. In II, active transport is used.
B. In II, products of photosynthesis are transported.
C. In I, movement of materials is the result of transpiration.
D. In I, there is a higher solute concentration.
- 17M.1.SL.TZ1.1: Which structure found in eukaryotes has a single membrane? A. Nucleus B. Lysosome C....
-
18M.1.HL.TZ2.29:
The micrograph shows the cross-section of the vascular tissue in a dicotyledonous root. Which letter identifies phloem sieve tubes?
[Source: Wendy Paul]
-
17N.1.HL.TZ0.33:
Which letter identifies phloem?
[Source: E R DEGGINGER/Getty Images]
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18M.2.HL.TZ1.7c:
Explain how organic compounds are transported within plants.
-
21M.1.HL.TZ2.33:
The image shows part of a section through the stem of a non-woody plant. Where does transport of sucrose occur?
[Source: Courtesy of Kelly Cude, PhD, Professor Biological Sciences, College of the Canyons.]
-
21N.2.HL.TZ0.7b:
Distinguish between the xylem and phloem of plants.
-
16N.2.HL.TZ0.7a:
Describe the transport of organic compounds in vascular plants.
- 17M.2.HL.TZ1.4c.i: Vascular plants can be found in a wide variety of ecosystems. Outline active transport in...
-
17N.2.HL.TZ0.08b:
Plants have widespread influences, from food chains to climate change.
Explain the process of water uptake and transport by plants.
- 19M.2.HL.TZ1.4a: Xylem and phloem contain structures that are adapted for transport. Outline the differences...
