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Exam (elaborations)

AQA PAST PAPER QUESTIONS A LEVEL BIOLOGY - MASS TRANSPORT IN PLANTS

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

Institution
AQA
Course
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

QUESTION PAPER




Score Percentage

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

, 1. (a) Describe the mass flow hypothesis for the mechanism of translocation in plants.

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(4)




Scientists measured translocation in the phloem of trees. They used carbon dioxide
labelled with radioactive 14C.

They put a large, clear plastic bag over the leaves and branches of each tree and
added 14CO2. The main trunk of the tree was not in the plastic bag.

At regular intervals after adding the 14CO2 to the bag, the scientists measured the
amount of 14CO2 released from the top and bottom of the main trunk of the tree. On
the surface of the trunk of these trees, there are pores for gas exchange.
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Examinator
AQA
Subject
A Level Biology
Unit
Unit 3 - Organisms exchange substances with their environment
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April 13, 2022
Number of pages
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Written in
2021/2022
Type
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Contains
Answers

Subjects

  • a level biology
  • past paper questions
  • exam questions
  • aqa
  • organisms exchange substances with their environment
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