This lesson describes the steps involved in the closure of the Venus flytrap as a response to touch by an insect or an arachnid. The PowerPoint and accompanying resources have been designed to cover the detail of point (1) of topic 15.2 of the CIE A-level biology specification (for assessment in 2025 - 27).
The lesson begins with a recall of tropisms as directional growth responses in plants and a short amount of time is allocated to discuss the importance of phototropism and gravitropism. This leads into the introduction of thigmotropism as a directional response to touch, before the students will learn that the closure of the Venus flytrap is an example of a thigmonastic response, a response that’s independent of direction. The students are presented with a passage that describes the classification, and structure of the Venus flytrap, as well as the stimulus that results in the closure. They must answer 8 exam-style questions on the content of the passage, which challenges their understanding of the current topic and links to other topics such as organelles and biological molecules. All answers are embedded into the PowerPoint to allow students to assess their progress.
The rest of the lesson focuses on the steps involved in the mechanism of closure, including the detection of touch by the sensors in the trigger hairs, the movement of ions, and the elongation of the cells in the lobes of the modified leaves.
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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.
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Topic 15.2: Control and coordination in plants (CIE A-level biology)
This bundle of 3 lessons covers the content of topic 15.2 of the CIE A-level biology specification (for assessment in 2025 - 27). This topic, titled control and coordination in plants, isn't always a student favourite, so additional time has been put into the design and planning to maintain engagement whilst ensuring that the A-level content is covered in detail. A lot of these biological processes are sequences of events, so step-by-step guides are used to aid retention. Understanding checks are found throughout the lessons, as well as prior knowledge checks which challenge content from earlier plant-based topics such as 14.2 and 7. All answers to these checks are embedded into the PowerPoints to allow the students to assess their progress. Topic 15.1, control and coordination in mammals, is also available on here, as well as the larger bundle containing all the topic 15 lessons.
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Topic 15: Control and coordination (CIE A-level biology)
These 12 lessons cover points 15.1 (1, 3, 4, 5, 6, 7, 9, 10, 11 & 12) and 15.2 (1, 2 & 3) from topic 15 of CIE A-level biology specification (for assessment in 2025 - 27). This topic is titled control and coordination and concerns comparisons between the endocrine and nervous system in mammals, and then the key structure of the nervous system before looking at this control in plants. Each lesson has been extensively planned and contains a wide range of engaging activities and tasks, interspersed with current and prior knowledge checks. The sensory, motor & intermediate neurones and cholinergic synapses lessons have been shared for free, if you want to download first to get an idea for the quality of these lessons.
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