AP BIOLOGY

BIOCHEMISTRY

PROPERTIES OF WATER

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What property of water allows Water Strider Insects to sit on the surface of the water?
A
adhesion
B
solvent
C
cohesion
D
specific heat
Explanation: 

Detailed explanation-1: -Water striders use the high surface tension of water and long, hydrophobic legs to help them stay above water. Water striders use this surface tension to their advantage through their highly adapted legs and distributed weight.

Detailed explanation-2: -Insects can walk on water because of a phenomenon called surface tension. This is essentially a property of water (or any liquid) which allows it to resist an external force.

Detailed explanation-3: -A simple example of cohesion in action comes from the water strider (below), an insect that relies on surface tension to stay afloat on the surface of water. Image of a water strider bug walking on the surface of water. This is possible thanks to the surface tension of the water.

Detailed explanation-4: -Answer and Explanation: Some tiny insects are able to walk on water because of the surface tension on the top of the water that is due to water’s cohesive properties. Water is cohesive, or ‘sticky, ’ because water molecules are attracted to each other, due to the polarity of the molecule.

Detailed explanation-5: -These long-legged insects are able to walk on the surface of the water because water has a very high surface tension. Surface tension is caused by cohesion of water molecules to one another by hydrogen bonds. (Water has the highest cohesive force of any liquid except that of mercury).

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