Question

Underwater plants have long thin leaves. What do will happen if they had big, broad leaves?

Answer 1

Beyond the trite answer, “Evolution doesn’t have to explain why,” I can speculate on a couple of reasons that may contribute to this form for aquatic plants —which may be common, though it’s certainly far from universal:

Plants underwater receive sunlight from the surface that is rapidly attenuated by the water, so it’s advantageous for them to reach closer to the surface by being longer.The effects of density and buoyancy mean that plants underwater have lower structural requirements (especially in terms of buckling) than plants on dry land, which means they can get away with being thinner.A thinner structure also helps reduce the force from the effects of viscosity in flowing water.

On the other hand, you may be focusing on things like seagrass families, to the exclusion of other types of aquatic plants.

if they have broad leaves these things would not have been possible for them to do.

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Answer 2

"Submerged plant have long thin leaves because these type of leaves allow the water currents to flow easily without any damage to the plant.

Long thin leaves of submerged plants also provide good shape and increases the availability of light whereas the presence of big and broad leaves will cause hindrance in water current and will damage the plant.

The big and broad leaves will increase the light availability to plant but damage cannot be overcome with this feature."