This resource on Populations & sustainability: What determines population size? OCR A-level biology contains an entire lesson. The Powerpoint presentation provides a series of student activities interspersed by illustrative information slides to keep learning active. The resource incorporates activities for a complete lesson in the delivery of the following graded lesson objectives:

1. Describe the factors that determine population size (Grade C)
2. Explain the impact of limiting factors on carrying capacity and final population size (Grade B)
3. Compare how r- and k-Strategists are adapted to reach carrying capacity (Grade A)

The activities include 1) Defining key terms (carrying capacity, limiting factors, competition) followed by a mark scheme and the opportunity for students to self-assess their answers; 2) Labelling a growth curve (A = lag phase, B = log phase, C = stationary phase and K = carrying capacity) followed by a mark scheme for self-assessment; 3) identifying characteristics of R- and K-strategists; 4) Population Dynamics Question sheet plenary activity.

Students are able to use the Student Notes document to fill in information from the Powerpoint as the lesson progresses. There is a Student Notes Script Answers that gives example of answers that may be expected from students.

Students are then able to use the the graded lesson objectives provided to reflect on their learning at the end of the lesson.

This resource is available as a single lesson and provides an example of the content and quality of my resources for GCSE and A Level biology, many of which are available as a much larger series of lessons in a bundle at a discount.