Question 1

What is the importance of water in the Cambridge IGCSE Coordinated Science curriculum?

Accepted Answer

In the Cambridge IGCSE Coordinated Science curriculum, water is crucial because it is a fundamental component of the Earth's ecosystem. It plays a vital role in various biological and chemical processes, such as photosynthesis, cellular respiration, and as a solvent in chemical reactions. Understanding water's properties and its cycle is essential for comprehending broader environmental and biological concepts.

Question 2

How does the water cycle contribute to the distribution of water on Earth?

Accepted Answer

The water cycle is a continuous process that distributes water across the Earth. It involves evaporation, condensation, precipitation, and collection. Water evaporates from surfaces like oceans and lakes, condenses to form clouds, and returns as precipitation (rain, snow, etc.). This cycle ensures the movement of water between the atmosphere, land, and bodies of water, maintaining ecological balance and supporting life.

Question 3

What are the unique properties of water that make it essential for life?

Accepted Answer

Water has several unique properties that make it essential for life. It is a universal solvent, allowing it to dissolve a wide range of substances, which is crucial for biological processes. Water has a high specific heat capacity, helping to regulate temperature in organisms and environments. Its cohesive and adhesive properties facilitate capillary action, vital for plant nutrient transport. Additionally, water's solid form (ice) is less dense than its liquid form, allowing ice to float and insulate aquatic life in cold climates.

Question 4

How is water purified for safe consumption in the context of Coordinated Science?

Accepted Answer

In Coordinated Science, water purification is an important topic. Water is purified through several methods to make it safe for consumption. These include filtration, which removes large particles; sedimentation, which allows particles to settle; and chlorination, which kills bacteria and other pathogens. Advanced methods like distillation and reverse osmosis are also used to remove impurities and contaminants, ensuring the water is safe for drinking.

Question 5

What are the environmental impacts of water pollution discussed in the Cambridge IGCSE curriculum?

Accepted Answer

The Cambridge IGCSE curriculum highlights several environmental impacts of water pollution. Polluted water can harm aquatic life, disrupt ecosystems, and lead to the loss of biodiversity. It can also contaminate drinking water sources, posing health risks to humans and animals. Additionally, water pollution can affect agricultural productivity and contribute to the eutrophication of water bodies, leading to algal blooms and oxygen depletion.

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