Focus: Scientific Foundations | Level: Junior Secondary (JSS3)
Integrated practice covering biology, physics, and chemistry concepts as required for the Junior WAEC.
Key Areas:
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Which of the following defines environmental pollution?
The release of harmful substances into the environment
Pollution is the introduction of harmful materials (pollutants) into the environment.
Which gas is primarily responsible for global warming?
Carbon dioxide
Carbon dioxide is a major greenhouse gas that traps heat in the atmosphere, contributing to global warming.
Water pollution can lead to the spread of which of the following diseases?
Cholera
Cholera is a waterborne disease caused by ingesting water contaminated with bacteria.
Anything that has mass and occupies space is known as:
Matter
Matter is defined as anything that has mass and takes up space (volume).
Which of the following is a characteristic of all living things?
They excrete waste products
Excretion is one of the characteristics of living things (MR NIGER D), whereas flying, having leaves, or fur are specific to only some organisms.
The process by which a solid changes directly to a gas without passing through the liquid state is called:
Sublimation
Sublimation is the transition of a substance directly from the solid to the gas state.
Which of these materials is non-biodegradable?
Polythene bag
Polythene (plastic) does not decompose easily by biological processes, unlike organic materials like paper, fruit peels, or wood.
The boiling point of pure water at sea level is:
100°C
Pure water boils at 100 degrees Celsius under standard atmospheric pressure.
Which method is best for separating a mixture of sand and water?
Filtration
Filtration allows the liquid (water) to pass through while trapping the insoluble solid (sand).
In the acronym MR NIGER D representing the characteristics of living things, what does 'R' stand for?
Respiration
R stands for Respiration (or Reproduction in some variations, but Respiration is the standard primary 'R').
