Question

question 18.
the image below depicts a lake that is frozen on the surface during winter months.
despite the surface freezing, the ecosystem above is maintained and life continues to exist. which scientific concept helps explain the importance of water and its relationship in supporting life during winter months?
a. transpiration allows liquid water to move from the surface into the lake to help support producers during cold periods.
b. since ice floats, the water below helps insulate heat and allows producers and consumers to continue to exist during winter times.
c. water is a better solvent during winter months, which allows life below to perform reactions in their bodies much quicker.
d. ice is a sticky molecule that allows it to form cohesive bonds with the land and the lakes surface. this allows life to exist during winter months.

Explanation:

When water freezes, it forms ice. Ice has a lower density than liquid water, so it floats. This floating ice acts as an insulator, preventing the water below from freezing completely. This insulation is crucial for the survival of aquatic life during winter as it maintains a relatively stable environment (temperature, liquid water availability) for producers and consumers in the lake ecosystem.

• Option A: Transpiration is related to water movement in plants (evaporation from leaves), not relevant to the lake - ice - life relationship described.
• Option C: While water is a good solvent, the key factor here is the insulating property of floating ice, not its solvent ability in the context of winter lake life support.
• Option D: Ice is not a "sticky molecule" in the sense described. Cohesive bonds in water (due to hydrogen bonding) are a general property, but the floating of ice (density difference) is the key here.

Answer:

B. Since ice floats, the water below helps insulate heat and allows producers and consumers to continue to exist during winter times.