This fully-resourced lesson describes the relationship between the structure of the chloroplast and its role in the overall reaction of photosynthesis. The detailed PowerPoint and accompanying resources have been designed to cover points 5.5 & 5.9 of the Pearson Edexcel A-level Biology A (Salters Nuffield) specification and provide a thorough introduction to the light-dependent and light-independent reactions which are covered in the next 3 lessons.
Students will have some knowledge of photosynthesis from GCSE and were introduced to the ultrastructure of eukaryotic cells in topics 3 and 4 so this lesson has been written to test and to build on that knowledge. A version of the quiz show POINTLESS runs throughout the lesson and this maintains engagement whilst challenging the students to recall the parts of the chloroplast based on a description which is related to their function. The following structures are covered in this lesson:
- double membrane
- thylakoids (grana)
- stroma
- intergranal lamellae
- starch grains
- chloroplast DNA and ribosomes
Once each structure has been recalled (or introduced) , a range of activities are used to ensure that key details are understood. As the main focus of the lesson is the reaction of photosynthesis, extra time is taken to introduce the details of the light-dependent and light-independent reactions that take place in the grana and stroma respectively. This includes descriptions of the role of the thylakoid membranes in the light-dependent reactions and the importance of ATP and reduced NADP for the reduction of GP to GALP in the Calvin cycle of the light-independent reactions. Links to other related topics are also made throughout and this is exemplified by the final task of the lesson where students are challenged on their recall of the structure, properties and function of starch (as originally covered in topic 1)
As described above, this lesson has been specifically planned to prepare students for the upcoming lessons that cover the details of specification points 5.7 & 5.8 (i) and (ii).
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