This lesson describes the role of the chlorophylls, carotene and xanthophyll and explains how to interpret absorption and action spectra. The PowerPoint and accompanying resources have been designed to cover points 4 and 5 in topic 13.1 of the CIE A-level biology specification.
The students are presented with a picture of a leaf with chlorosis at the start of the lesson and are challenged to explain the appearance by drawing on any knowledge from GCSE. The lesson has been intricately planned to build on the previous lesson on the structure of the chloroplast, and the students are reminded that chlorophyll is located in the thylakoids. The students will learn that there are two forms of chlorophyll a as well as a chlorophyll b, and a quick quiz round is used to reveal the values of 680 and 700. The absorption spectrum for chlorophyll a and b are displayed and when they are presented with a spectra, the students will discover that there are more chloroplast pigments. The carotenoids are introduced and the students have to interpret the spectra to reveal more details about these pigments. The meaning of an action spectrum is provided and the students are challenged to draw a sketch graph to show how the rate of photosynthesis differs for different wavelengths.
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Topic 13: Photosynthesis (CIE A-level Biology)
This bundle contains 7 fully-resourced lessons which are highly detailed and will engage and motivate the students whilst covering the content of topic 13 of the CIE A-level Biology specification (for assessment in 2025 - 27). The following specification points are covered: Topic 13.1: points 1 - 12 Topic 13.2: points 1 & 2 The lesson PowerPoints and accompanying resources contain a wide range of tasks which include exam-style questions, whole class discussion periods and quiz competitions which are designed to introduce key terms and values in a memorable way. If you would like to get an idea of the quality of these lessons, then download the Calvin cycle intermediates lesson as this has been shared for free.
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Topics 12 & 13: Respiration and photosynthesis (CIE A-level Biology)
Respiration and photosynthesis are two of the most commonly-assessed topics in the terminal A-level exams but are often poorly understood by students. These 16lessons have been intricately planned to contain a wide range of activities that will engage and motivate the students whilst covering the key detail to try to deepen their understanding and includes exam-style questions so they are fully prepared for these assessments. The following specification points in topics 12 and 13 of the CIE A-level Biology course are covered by these lessons: * The need for energy in living organisms * The features of ATP * The synthesis of ATP by substrate-level phosphorylation in glycolysis and the Krebs cycle * The roles of the coenzymes in respiration * The synthesis of ATP through the electron transport chain in the mitochondria and chloroplasts * The relative energy values of carbohydrates, lipids and proteins as respiratory substrates * Determining the respiratory quotient from equations for respiration * The four stages of aerobic respiration * An outline of glycolysis * When oxygen is available, pyruvate is converted into acetyl CoA in the link reaction * The steps of the Krebs cycle * Oxidative phosphorylation * The relationship between the structure and function of the mitochondrion * Distinguish between aerobic and anaerobic respiration in mammalian tissue and in yeast cells * Anaerobic respiration generates a small yield of ATP and builds up an oxygen debt * The products of the light-dependent stage are used in the Calvin cycle * The structure of a chloroplast and the sites of the light-dependent and light-independent stages of photosynthesis * The role of the chloroplast pigments * Absorption and action spectra * Using chromatography to separate the chloroplast pigments * The light-dependent stage of photosynthesis * The three stages of the Calvin cycle * The conversion of Calvin cycle intermediates to carbohydrates, lipids and amino acids * Explain the term limiting factor in relation to photosynthesis * Explain the effects of changes in light intensity, carbon dioxide concentration and temperature on the rate of photosynthesis * Explain how an understanding of limiting factors is used to increase crop yields in protected environments Due to the detail of these lessons, it is estimated that it will take up to 2 months of allocated A-level teaching time to cover the detail included in the slides of these lessons If you would like to sample the quality of the lessons, download the roles of the coenzymes, the Krebs cycle and the products of the Calvin cycle lessons as these have been shared for free
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