Marine Biology Part 5

44. Which of the following explains why a water strider bug can float on the surface of a pond?

• A. Surface tension, caused by capillary action of the water.

• B. Surface tension, caused by hydrogen bonding of water.

• C. Surface tension, caused by the covalent bonds of water

• D. Surface tension, caused by ionic bonding of water.

45. Water is often called the "universal solvent" because many substances can be dissolved in water. What property of water allows it to be such a versatile solvent?

• A. purity

• B. high heat capacity

• C. expansion upon freezing

• D. polarity and cohesion

46. Many fish and aquatic plants can survive a cold winter because the layer of ice that forms at the top of the lake insulates the water below and prevents the lake from freezing solid. What unique property of water contributes to this effect?

• A. Water forms hydrogen bonds with ions and other polar substances.

• B. Water expands and becomes less dense when it freezes.

• C. Water absorbs heat when it evaporates and forms a gas.

• D. Water molecules completely separate into ions in solutions.

47. A water molecule has a negative charge and a positive charge. This indicates that the water molecule is

____________________.

• A. Neutron

• B. Nonpolar

• C. Polar

• D. Proton

48. Tail slapping is a behavior in many marine porpoises perform a behavior known as tail slapping to communicate to other members of their group that there may be something dangerous or new in the area. When they slap their tails against the water it makes a loud splashing noise, which can be hear by their groups from long distances. Which of the following explanations best states how water's unique properties contribute to the effectiveness of tail slapping as a method of communication?

This one is a challenging question, but what about water allows it to make a loud sound when it is hit rapidly by a flat object. Another question that might help you with this question is, if water did not have this property, what sound would it make?

• A. Water has a high surface tension.

• B. Water is the universal solvent.

• C. Water has lower density as a liquid.

• D. Water has a high specific heat.

49. In relation to the floating piece of ice, which property of water is this polar bear relying on?

• A. Density

• B. Polarity

• C. Adhesion

• D. Cohesion

50. Which of the following statements about marine viruses is NOT true?

• A. Marine viruses are involved in the release of DOM (dissolved organic matter) into the water.

• B. Marine viruses bridge the gap between the non-living and the living.

• C. The genetic material of marine viruses is in the form of DNA or RNA.

• D. Marine viruses consist of tiny cells sometimes attached into chains.