I have a Lab Report due tommorow and I don‘t know how chunkier soil effects the growth of a plant.
Chunky? As in less fine and more coarse grained? If the soil structure is too fine, then you have clay and the drainage is poor. If the texture is too coarse (sandy) and there's not enough organic components (decomposing plant matter usually associated with earthworms), then the water and nutrients needed by the roots tends to run off.
Chunky soil contains a lot of clay and holds in water and is good for plants like cabbages and Brussels sprouts.