Movement in the Phloem (AQA A-Level Biology): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What is translocation in flowering plants?
What is translocation in flowering plants?
Transport of organic molecules & ions via phloem
Why do companion cells contain many mitochondria?
Why do companion cells contain many mitochondria?
For ATP production for active transport
Which best describes a source in translocation?
Which best describes a source in translocation?
Where sugars are produced by photosyn.
Which substance is NOT mentioned as being transported in phloem?
Which substance is NOT mentioned as being transported in phloem?
Oxygen gas
How does sucrose enter companion cells during loading?
How does sucrose enter companion cells during loading?
Co-transport with hydrogen ions
What happens to water potential in sieve tubes when sucrose is loaded at the source?
What happens to water potential in sieve tubes when sucrose is loaded at the source?
It decreases due to high solute conc.
What drives the mass flow of solution through sieve tubes?
What drives the mass flow of solution through sieve tubes?
Pressure gradient from source to sink
What happens to sucrose at sink tissues?
What happens to sucrose at sink tissues?
Used for respiration or stored as starch
Which observation supports the mass flow theory?
Which observation supports the mass flow theory?
Flow stops when leaves are shaded
Which finding questions the mass flow theory?
Which finding questions the mass flow theory?
Sieve plates may hinder flow