Assessment Science (Water and Life - Photosynthesis)

Water is an essential component for life on Earth. What is the main function of water in the cells of living organisms?

• As a source of energy

• As a solvent for biochemical reactions

• As a component of DNA

• As a source of oxygen

Answer explanation

Water acts as a solvent in cells, facilitating biochemical reactions by dissolving various substances, which is crucial for metabolic processes. This makes 'as a solvent for biochemical reactions' the correct choice.

Which of the following statements is most accurate regarding water as a solvent?

• Water can only dissolve solid substances

• Water only dissolves nonpolar compounds

• Water can dissolve many substances due to its polar nature

• Water cannot dissolve salt

Answer explanation

The correct statement is that water can dissolve many substances due to its polar nature. Water's polarity allows it to interact with and dissolve ionic and polar compounds, making it an excellent solvent.

Sri is observing the process of water changing from the surface of the earth into water vapor due to the heat of the sun. This process is called?

• Condensation

• Precipitation

• Evaporation

• Transpiration

Answer explanation

The process Sri is observing, where water changes from liquid to vapor due to heat from the sun, is called evaporation. This is distinct from condensation, precipitation, and transpiration, which involve different phases of water.

In the water cycle, water vapor in the atmosphere cools and changes into droplets of water called?

• Condensation

• Precipitation

• Evaporation

• Transpiration

Answer explanation

In the water cycle, when water vapor cools, it transforms into liquid droplets through a process called condensation. This is a key step before precipitation occurs.

Hadi is studying the water cycle and wants to know more about the process of water falling from the atmosphere to the Earth's surface in the form of rain, snow, or ice called?

• Condensation

• Precipitation

• Evaporation

• Transpiration

Answer explanation

The process of water falling from the atmosphere to the Earth's surface as rain, snow, or ice is called precipitation. This is distinct from evaporation and condensation, which are other stages of the water cycle.

The process of water movement into the ground through soil pores is called?

• Condensation

• Precipitation

• Evaporation

• Infiltration

Answer explanation

The process of water movement into the ground through soil pores is called infiltration. It differs from condensation, precipitation, and evaporation, which involve water in different states or processes.

The process of water evaporation that comes from plants is called?

• Condensation

• Precipitation

• Evaporation

• Transpiration

Answer explanation

The process of water evaporation from plants is specifically called transpiration. It involves the release of water vapor from plant leaves into the atmosphere, distinguishing it from general evaporation, condensation, and precipitation.

Rainwater that seeps into the ground through the process of infiltration is very important for human life because?

• Adds salt content to the oceans

• Provides water for plants and animals

• Reduces the amount of water in rivers

• Makes the surface of the land drier

Answer explanation

Rainwater infiltration is crucial as it replenishes groundwater, providing essential water for plants and animals, supporting ecosystems and human agriculture.

In the dry season, one of the effects of the disruption of the water cycle is?

• High rainfall

• Flooding

• Drought and reduced clean water sources

• Increased water levels in lakes

Answer explanation

In the dry season, the disruption of the water cycle leads to drought conditions, resulting in reduced clean water sources. This is the opposite of high rainfall or flooding, which occur in wet conditions.

A farmer is having difficulty obtaining irrigation water during the dry season. Based on your understanding of the water cycle, what long-term solution can the farmer implement to address this issue?

• Letting his farmland remain unplanted during the dry season

• Digging deeper to find groundwater sources

• Planting crops that require more water

• Creating a rainwater harvesting system to use during the dry season

Answer explanation

Creating a rainwater harvesting system allows the farmer to collect and store water during the rainy season for use in the dry season, providing a sustainable solution to irrigation water shortages.