Plants are autotrophic and animals are heterotrophic. Thus plants are the primary source of food for animals. One way or another, all animals are getting their food from plants. Besides food, autotrophs liberate oxygen — very important to all eukaryotic life.
Plants directly or indirectly responsible for our environment regulation. Plants helps to clean air, prevent soil erosion and its pollution at some extent.
Why we are dependent on plants? Because
- They provide our daily and basic needs, e.g: fuels, cloth, food etc
- They maintain our environment purifies air, produces oxygen which is crucial for us.
- Maintain temperature by reducing the effects of global warming.
So if autotrophs were not on Earth, the heterotrophs would die, not be able to survive.
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