Explanation

Gases from household materials are not a direct cause of water pollution.

Water pollution is typically caused by the release of harmful substances into water bodies, such as:

• Sewage water from homes (containing human waste, chemicals, and other pollutants)
• Untreated water from industries (containing industrial chemicals, heavy metals, and other pollutants)
• Water runoff from agriculture (containing pesticides, fertilizers, and other pollutants)

Explanation

• Insects are a group of animals that have three pairs of jointed legs, and many of them have one or two pairs of wings.
• Their body is divided into three main segments: head, thorax, and abdomen.
• Insects include a wide range of species, some of which suck blood (like mosquitoes) or nectar from flowers (like bees and butterflies).
• Insects also lay eggs.

Explanation

• The Earth's axis is an imaginary line that runs through the North Pole and the South Pole, around which the Earth rotates.
• It is an imaginary reference point, not a physical object or shape.

Explanation

• The orbit of the Earth around the Sun is an ellipse, meaning that it is an elongated circle, with the Sun located at one of the two foci (plural of focus) of the ellipse.
• This means that the distance between the Earth and the Sun varies throughout the year.
• With the closest point (perihelion) occurring around early January.
• With the farthest point (aphelion) occurring around early July.
  

Explanation

• A thermometer is typically made up of a glass tube filled with Mercury (Hg), a silvery-white liquid metal.
• The Mercury expands or contracts in response to changes in temperature, allowing us to measure the temperature.

Explanation

The the life cycle of a butterfly:

• Eggs: The female butterfly lays eggs on a leaf.
• Caterpillar (Larva): The egg hatches into a caterpillar, which eats and grows.
• Pupa (Chrysalis): The caterpillar transforms into a pupa, a resting stage where it undergoes metamorphosis.
• Adult (Butterfly): The pupa emerges as a fully formed adult butterfly, ready to fly and reproduce.

Explanation

The main function of the lungs is the process of gas exchange called respiration (or breathing).

In respiration, oxygen from incoming air enters the blood, and carbon dioxide, a waste gas from the metabolism, leaves the blood.

Explanation

Agrobacterium tumefaciens is a bacterium commonly used to introduce foreign genes into plants, creating transgenic plants like golden rice.

It naturally transfers DNA into plant genomes.

Explanation

The renewable energy sources are:

• Water energy
• Wind energy
• Tidal energy
• Hydroelectric
• Ocean energy
• Geothermal energy
• Biomass
• Biogas

The non-renewable energy sources are:

• Fossil fuels or Hydrocarbon fuel (Oil, Natural gas, Coal)
• Nuclear energy

Explanation

• The magnet is the part of a bicycle dynamo that spins to generate electricity.
• When the magnet rotates, it induces an electric current in the coils of the dynamo.
• It producing electricity to power the bike's lights or other accessories.