why it happen that some type of wood float on water and some do not?
Wood does not sink in water because it is less dense than water.But some type of wood e.g ebony is dense black wood enough to sink in water.
Some plants produce two types of very different looking flowers. One example is that of water melon. However, most plants like hibiscus produce only one type of flower. Why do you think this happens?
A block of wood is so loaded that it just floats in water at room temperature. If some salt is added to water, then the wood