SDS is found in most household detergents and is known to reduce the surface tension of water. Water striders are dependent on surface tension of water to move around and capture food. The hypothesis is that the water strider will break the surface tension and sink at some concentration of detergent. Background to top Many people today are concerned with environmental issues. They are aware that water pollution can be harmful to living things, but may be unsure as to exactly how or why.
Pollution can impact many of an organism's life functions and essential activities.
Water striders are predatory insects that are able to stand on water, move about and capture prey without sinking. Students are naturally curious about how these insects can do this. It is likely students would suggest water pollution as one factor that could affect this behavior. They may ask about other animals that have similar abilities. They may be interested in examining other types of pollution that could affect movement.