Mass transport in plants

Biology · A-Level · AQA · AQA A-Level Biology - (7402) · Specification point · 3.3.4.2 · Organisms exchange substances with their environment · Mass transport

Cohesion-tension theory

Mass flow hypothesis

Tracer experiments in plant transport

Ringing experiments in plant transport

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3.3.4.2 Mass transport in plants

Content	Opportunities for skills development
$Xylem as the tissue that transports water in the stem and leaves of plants. The cohesion-tension theory of water transport in the xylem. Phloem as the tissue that transports organic substances in plants. The mass flow hypothesis for the mechanism of translocation in plants. The use of tracers and ringing experiments to investigate transport in plants. Students should be able to: recognise correlations and causal relationships interpret evidence from tracer and ringing experiments and to evaluate the evidence for and against the mass flow hypothesis.$	$AT b Students could set up and use a potometer to investigate the effect of a named environmental variable on the rate of transpiration.$

Content

Opportunities for skills development

Xylem as the tissue that transports water in the stem and leaves of plants. The cohesion-tension theory of water transport in the xylem. Phloem as the tissue that transports organic substances in plants. The mass flow hypothesis for the mechanism of translocation in plants. The use of tracers and ringing experiments to investigate transport in plants. Students should be able to: recognise correlations and causal relationships interpret evidence from tracer and ringing experiments and to evaluate the evidence for and against the mass flow hypothesis.

AT b Students could set up and use a potometer to investigate the effect of a named environmental variable on the rate of transpiration.

Mass transport in plants (3.3.4.2) | AQA A-Level Biology - (7402) | KnowledgeSet