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To calculate the energy consumed by the electric bulbs in the month of February, first, we calculate the energy consumed by the 250-watt bulb and the four 6-watt bulbs separately. Then, we sum up the total energy consumed. Energy consumed by the 250-watt bulb in 5 hours = 250×5/1000 kWh Energy consumed by each 6-watt bulb in 4.5 hours = 6×4.5×4/1000 kWh Total energy consumed in the month of February = Energy consumed by the 250-watt bulb + Energy consumed by the four 6-watt bulbs

Many thermal plants are set up near coal or oil fields because:

1. Fuel Availability: Thermal power plants primarily rely on coal or oil as fuel for generating electricity. Setting up plants near coal or oil fields reduces transportation costs and ensures a steady and reliable supply of fuel to the power plants.

2. Efficiency: Proximity to coal or oil fields allows for efficient extraction and transportation of fuel to the power plants, minimizing losses associated with fuel transportation and storage.

3. Infrastructure: Coal or oil fields often have existing infrastructure such as railways, pipelines, and storage facilities, which can be utilized for transporting fuel to thermal power plants, thereby reducing initial setup costs and time.

Renewable resources of energy are those that are replenished naturally and are not depleted with use. Examples include solar energy, wind energy, hydroelectric energy, biomass energy, and geothermal energy. Non-renewable resources of energy are those that are finite and deplete over time with use. Examples include fossil fuels such as coal, oil, and natural gas.

• Pesticides are considered pollutants despite being useful to farmers because they can have harmful effects on the environment, including contamination of soil, water, and air, as well as adverse effects on non-target organisms such as beneficial insects, birds, and mammals.

We need to use resources carefully to ensure their sustainable availability for current and future generations. Careful resource management helps prevent resource depletion, environmental degradation, and loss of biodiversity, ensuring that essential resources remain available for various human needs.