pptx, 5.64 MB
pptx, 5.64 MB
docx, 28.34 KB
docx, 28.34 KB
DOC, 16.02 KB
DOC, 16.02 KB

This lesson describes how the structures of the xylem vessel elements, phloem sieve tube elements and companion cells relates to their functions. Both the engaging and detailed PowerPoint and accompanying resources have been designed to cover point 7.1 (d) of the CIE International A-level Biology specification.

The lessons begins by challenging the students to identify the substances that a plant needs for the cellular reactions, where they are absorbed and where these reactions occur in a plant. The aim of this task is to get the students to recognise that water and mineral ions are absorbed in the roots and needed in the leaves whilst the products of photosynthesis are in the leaves and need to be used all over the plant. Students will be reminded that the xylem and phloem are the vascular tissues responsible for transporting these substances and then the rest of the lesson focuses on linking structure to function. A range of tasks which include discussion points, exam-style questions and quick quiz rounds are used to describe how lignification results in the xylem as a hollow tube of xylem cells to allow water to move as a complete column. They will also learn that the narrow diameter of this vessel allows capillary action to move water molecules up the sides of the vessel. The same process is used to enable students to understand how the structures of the companion cells allows assimilates to be loaded before being moved to the sieve tube elements through the plasmodesmata.

It is estimated that it will take around 2 hours of A-level teaching time to cover the detail which has been written into this lesson.

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Topics 7 & 8: Transport in plants & mammals (CIE A-level Biology)

This bundle contains 11 fully-resourced lessons which will engage and motivate the students whilst covering the following specification points in topics 7 and 8 of the CIE A-level Biology specification: TOPIC 7 * The structure of xylem vessel elements, phloem sieve tube elements and companion cells * The relationship between the structure and function of xylem vessel elements, phloem sieve tube elements and companion cells * Explain how hydrogen bonding of water molecules is involved with the movement in the xylem by cohesion-tension in transpiration pull and adhesion to cell walls * The pathways and mechanisms by which water and mineral ions are transported from the soil to the xylem and from roots to leaves * Assimilates move between sources and sinks between phloem sieve tubes * The mechanism by which sucrose is loaded into the phloem * The mass flow of phloem sap down a hydrostatic pressure gradient TOPIC 8 * The double, closed circulatory system of a mammal * The relationship between the structure and function of arteries, veins and capillaries * The role of haemoglobin in carrying oxygen and carbon dioxide * The significance of the oxygen dissociation curve of adult haemoglobin at different carbon dioxide concentrations * The external and internal structure of the heart * The cardiac cycle * The role of the SAN, AVN and Purkyne tissue in the initiation and conduction of the heart action The lesson PowerPoints and accompanying resources contain a wide range of tasks which include exam-style questions with mark schemes, discussion points and quiz competitions that will check on current understanding as well as making links to previously covered topics.

£15.00

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