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Exam (elaborations)

AQA PAST PAPER MARK SCHEME A LEVEL BIOLOGY - MASS TRANSPORT IN PLANTS

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This document provides the mark scheme to the 27 past paper questions on the topic of mass transport in plants.

Institution
AQA
Module
Unit 3 - Organisms exchange substances with their environment

Content preview

AQA
A-Level
BIOLOGY
3.3 | Organisms Excange Substances
3.6 | Mass Transport in Plants

Time allowed
38 minutes

MARK SCHEME




Score Percentage

/32 %
4.1 | CELL BIOLOGY | QUESTION PAPER 1 1

, 1.(a) 1. In source / leaf sugars actively transported into phloem;
2. By companion cells;
3. Lowers water potential of sieve cell / tube and water enters by osmosis;
4. Increase in pressure causes mass movement (towards sink / root);
5. Sugars used / converted in root for respiration for storage.
Accept starch
4 max




(b) Respiration.
1




(c) 1. (About) 30 hours;
2. Time between peak 14C at top of trunk and bottom.
2




(d) Length of trunk (between top and bottom).
1
[8]
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Study Level
A/AS Level
Examinator
AQA
Subject
A Level Biology
Unit
Unit 3 - Organisms exchange substances with their environment
All documents for this subject (212)

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Uploaded on
April 13, 2022
Number of pages
5
Written in
2021/2022
Type
Exam (elaborations)
Contains
Answers

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