Two identical groups of seedlings receive the same amounts of water and mineral ions. One group grows beneath a dense tree canopy and grows more slowly.
Which explanation best accounts for this difference?
Less light increases photosynthesis, so less glucose is produced.
Less light reduces photosynthesis, so less glucose is produced.
Less light increases photosynthesis, so more glucose is produced.
Less light reduces photosynthesis, so more glucose is produced.
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.