i) Functional energy sources:** These are energy sources that can be directly used for a specific purpose without requiring conversion into another form of energy.

Here are the explanations for the terms and consequences:

a)

• i) Functional energy sources: These are energy sources that can be directly used for a specific purpose without requiring conversion into another form of energy.
  • Example: Solar energy used directly to heat water in a solar water heater.
• ii) Secondary energy sources: These are energy forms that are derived from the conversion of primary energy sources. They are not found naturally in a directly usable form.
  • Example: Electricity generated from burning coal or natural gas.

b)

• i) Consequences of global warming on human health: Global warming leads to increased heat-related illnesses like heatstroke and dehydration. It also expands the geographical range of disease vectors, increasing the incidence of vector-borne diseases such as malaria and dengue fever. Additionally, it can worsen air quality, leading to respiratory problems.
• ii) Consequences of global warming on the environment: Rising global temperatures cause glaciers and ice sheets to melt, contributing to rising sea levels and coastal flooding. It also leads to more frequent and intense extreme weather events like heatwaves, droughts, and severe storms. Ecosystems face disruption, resulting in habitat loss and a decline in biodiversity.