After heavy rain, water is no longer limiting the growth of plants in a crowded flower bed. Growth still remains slow.
Which explanation is most likely?
The plants have stopped competing because water is available.
The rainfall has removed the need for light during growth.
Another resource, such as light, is now limiting growth.
Every plant now receives the same amount of each resource.
82 exam-style questions on Edexcel GCSE Biology 9.1 Ecosystems and interdependence, covering 9.1.1 Levels of organisation in ecosystems, 9.1.2 Abiotic and biotic factors, 9.1.3 Importance of interdependence, 9.1.4 Parasitism and mutualism, and 9.1.5 Determining number of organisms in an area. Each one has a worked solution and a mark scheme showing where the marks go.