This lesson describes the mechanism by which the guard cells open and close the stomatal apertures in response to changes in environmental conditions. The PowerPoint and accompanying resources have been designed to cover points 1, 2 and 3 as set out in topic 14.2 of the CIE A-level biology specification (for assessment in 2025 - 2027).
The lesson begins with a plant biology check, where the students have to spot the structure which isn’t found in a leaf, and then to spot the three leaf cells. This reveals the palisade and spongy mesophyll cells, but most importantly the guard cells. In a change to the normal, this lesson considers the function of the guard cells first before the structure is considered, and an understanding of the relationship between the two is embedded. Students will understand that there’s a balance between the opening of the stomatal aperture to allow carbon dioxide to diffuse in for photosynthesis, with the closing to reduce transpiration losses. The students’ knowledge of photosynthesis and other related topics are challenged throughout, and answers to all of the questions are found in the PowerPoint to allow the students to assess their progress. The final part of the lesson describes the mechanism by which the guard cells open the stomata, including details of ATP, potassium ions and the movement of water by osmosis.
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Topics 14.2 & 15.2: Homeostasis and control and coordination in plants (CIE A-level biology))
It's fair to say that the plant-based topics are not every students' favourite, so the lessons in this bundle are full of engaging activities and knowledge checks to maintain motivation whilst ensuring that the A-level details are understood. These 5 lessons cover the plant sections of topics 14 and 15 of the CIE A-level biology specification (for assessment in 2025 - 27) and complement each other by building on knowledge attained in the previous lesson.
£10.00
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Homeostasis in plants (Topic 14.2 CIE A-level bio)
This bundle covers the content of the 4 specification points in topic 14.2 of the CIE A-level biology specification, titled "Homeostasis in plants". The 4 specification points concern the structure and function of guard cells as well as the role of abscisic acid and calcium ions in a plant's response to water stress. The plant biology topics can be poorly understood by students, so both lessons have been filled with understanding checks so students can constantly assess their progress and address any knowledge gaps that arise.
£5.00
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Topic 14: Homeostasis (CIE A-level biology)
This bundle of 9 lessons describes homeostasis in mammals and plants, explaining the content using real-world examples including osmoregulation and the control of blood glucose and the opening and closing of the stomatal apertures. The lessons have been planned at length and are filled with a wide variety of tasks which will engage and motivate the students whilst checking on their understanding of the following points from topic 14 of the CIE A-level biology specification (for assessment in 2025-27): 14.1: 1 - 10 14.2: 1 - 4 (ALL) The quality of the lessons can be experienced through the download of the osmoregulation lesson as this has been shared for free.
£18.50
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