lesson
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Step into a dense tropical rainforest, and you will notice something eerie: the ground is almost completely dark.
Less than two percent of sunlight reaches the forest floor because plants are locked in a silent, high-stakes battle for survival.
The Four Vital Resources
Plants cannot move to hunt food, so they must harvest all their growth materials from their immediate surroundings.
Plants compete for four essential abiotic resources—non-living environmental factors: light, space, water, and mineral ions.
📊Interactive diagram
How do plants gain an edge when competing above the soil line?
The Race for Light and Space
Light fuels photosynthesis, the chemical reaction that transforms carbon dioxide and water into glucose and oxygen.
Plants that grow rapidly tall develop an overhanging canopy that absorbs sunlight while casting a shadow that starves neighbors below.
Understory plants survive by adapting broad leaves packed with extra chlorophyll, or by acting as spring ephemerals—flowering early in the spring before large trees grow leaves.
📊Interactive diagram
Winning the sky is only half the battle—what strategies unfold underground?