Question

what role do plants play in ecological balance

Answer 1

they inhale co2 and release oxygen , which is used for respiration of animals and humans.
they help in preventing soil erosion.
they help in holding water capacity of soil.

Answer 2

1-As photosynthesizers, plants provide organic molecules for energy (food) for the entire ecosystem.
2- they produce oxygen, required by most organisms.
3- they provide shelter for many small organisms (hide among leaves or roots for example).