Breathing and Respiration
What is the correct word equation for aerobic respiration?
A. glucose + oxygen → carbon dioxide + glucose
B. carbon dioxide + water → glucose + oxygen
C. glucose + oxygen → carbon dioxide + water
D. glucose + water → oxygen + carbon dioxide
Correct Answer: C. glucose + oxygen → carbon dioxide + water
Which of the following is a reason why biodiversity is important?
A. It reduces the number of species in an area
B. It helps ecosystems remain stable and resilient
C. It increases pollution levels
D. It ensures all animals eat the same food
B. It helps ecosystems remain stable and resilient
1. What does the term “malleable” mean when talking about metals?
A) Can be stretched into a wire
B) Can be hammered into thin sheets
C) Breaks easily when bent
D) Does not conduct electricity
B) Can be hammered into thin sheets
What is an element’s position in the periodic table based on?
A. Its melting point
B. The number of atoms it contains
C. Its atomic number (number of protons)
D. The colour of the element
C. Its atomic number
What happens to the particles in a substance when it is heated?
A. They move slower and the substance contracts.
B. They move faster and the substance expands.
C. The number of particles increases, making the substance expand.
D. The particles stay still and the substance does not change.
B. They move faster and the substance expands.
Which of the following statements about transverse and longitudinal waves is correct?
A. Transverse waves cause the medium's particles to move parallel to the direction of the wave.
B. Longitudinal waves travel faster than transverse waves in all materials.
C. Transverse waves have crests and troughs, while longitudinal waves have compressions and rarefactions.
D. Both transverse and longitudinal waves cannot transfer energy through a medium.
C. Transverse waves have crests and troughs, while longitudinal waves have compressions and rarefactions.
Where does aerobic respiration happen inside a cell?
A. Nucleus
B. Mitochondria
C. Ribosome
D. Cytoplasm
B. Mitochondria
Which part of the flower produces pollen?
A. Stigma
B. Ovary
C. Petal
D. Anther
D. Anther
2. When iron reacts with water and oxygen, what is formed?
A) Salt
B) Rust
C) Copper oxide
D) Carbon dioxide
B) Rust
Which of these describes how Mendeleev arranged his periodic table?
A. Alphabetically by name
B. In order of increasing atomic mass, leaving gaps for undiscovered elements
C. By grouping them into metals and non-metals
D. By how flammable the elements were
B. In order of increasing atomic mass, leaving gaps for undiscovered elements
What causes pressure in fluids (liquids and gases)?
A. The size of the particles in the fluid.
B. The particles moving and colliding with surfaces or each other.
C. The temperature of the fluid only.
D. The density of the fluid.
B. The particles moving and colliding with surfaces or each other.
When light enters a denser medium (like glass), which of the following occurs?
A. The light speeds up and bends away from the normal.
B. The light slows down and bends towards the normal.
C. The light changes colour and spreads into a spectrum.
D. The light does not refract and continues in a straight line.
B. The light slows down and bends towards the normal.
Which of the following best explains why alveoli are efficient for gas exchange?
A. They contain muscle tissue to pump air in and out
B. They have thick walls and slow blood flow
C. They have a large surface area and thin walls
D. They are dry and allow gases to stick to them
C. They have a large surface area and thin walls
How are pollen grains adapted for insect pollination?
A. They are heavy and sticky to attach to insects
B. They are tiny and smooth to float in the air
C. They produce a scent to attract insects
D. They grow roots to anchor themselves in soil
A. They are heavy and sticky to attach to insects
3. Which of these is a property of non-metals?
A) Shiny and good conductors
B) Brittle and poor conductors
C) Can be bent without breaking
D) React strongly with acids to release hydrogen
B) Brittle and poor conductors
What do all elements in the same group of the periodic table have in common?
A. They have the same number of protons
B. They react the same with every substance
C. They have similar chemical properties and the same number of outer electrons
D. They are all gases at room temperature
C. They have similar chemical properties and the same number of outer electrons
Why does pressure in a fluid increase with depth?
A. The volume of the fluid increases at greater depths.
B. The weight of the fluid above presses down on the fluid below.
C. The particles move slower as you go deeper.
D. The fluid becomes less dense at greater depths.
B. The weight of the fluid above presses down on the fluid below.
Which of the following best describes the relationship between the angle of incidence and the angle of reflection?
A. The angle of incidence is always double the angle of reflection.
B. The angle of incidence equals the angle of reflection, but only for waves in water.
C. The angle of incidence equals the angle of reflection, according to the law of reflection.
D. The angle of reflection is always zero, regardless of the angle of incidence.
C. The angle of incidence equals the angle of reflection, according to the law of reflection.
How does carbon monoxide in cigarette smoke affect gas exchange in the body?
A. It increases the breathing rate to take in more oxygen
B. It binds to haemoglobin in red blood cells, preventing oxygen from binding
C. It dissolves in the alveoli and causes more oxygen to be absorbed
D. It increases the surface area of the alveoli
B. It binds to haemoglobin in red blood cells, preventing oxygen from binding
Which of the following best explains interdependence in an ecosystem?
A. All organisms compete for the exact same food
B. Organisms only interact during reproduction
C. Organisms rely on each other for resources like food, shelter, and pollination
D. Each population in an ecosystem lives completely separately
C. Organisms rely on each other for resources like food, shelter, and pollination
4. What gas is released when metals react with acids?
A) Oxygen
B) Hydrogen
C) Carbon dioxide
D) Nitrogen
B) Hydrogen
Which of the following is an example of an irreversible chemical change?
A. Melting ice
B. Burning magnesium in air
C. Evaporating Water
D. Dissolving sugar in tea
B. Burning magnesium in air
Why does saltwater provide more upthrust than pure water?
A. Saltwater has a higher density, meaning the mass of the displaced water is greater.
B. Saltwater has more particles, making it exert more force on objects.
C. Saltwater contains dissolved gases that provide extra buoyant force.
D. Saltwater is less dense than pure water, creating greater pressure on objects.
A. Saltwater has a higher density, meaning the mass of the displaced water is greater.
Which of the following phenomena occurs when a light wave is refracted through a prism?
A. The light wave bends into a single direction, without separating into different colours.
B. The light bends at different angles based on the wavelength, creating a visible spectrum.
C. The light wave completely reflects inside the prism and does not exit.
D. The light bends, but the colours remain unchanged, forming a white spectrum.
B. The light bends at different angles based on the wavelength, creating a visible spectrum.
Why do both breathing rate and heart rate increase during exercise?
A. The body needs to cool down
B. The muscles are contracting and need to stop
C. More oxygen and glucose are needed for increased aerobic respiration
D. The body needs to remove less carbon dioxide
C. More oxygen and glucose are needed for increased aerobic respiration
Which of these best describes how sexual reproduction in plants works?
A. Only one parent is needed and offspring are identical
B. Pollen from one plant fertilises the ovule of another, creating variation
C. The seed splits and clones itself to grow faster
D. A plant uses its roots to grow another identical plant
B. Pollen from one plant fertilises the ovule of another, creating variation
5. Which statement about energy during reactions is true?
A) Energy is always absorbed and the surroundings get colder
B) Energy is released and the surroundings get warmer
C) Energy never changes
D) Only metals can release energy
B) Energy is released and the surroundings get warmer
Why do alkali metals become more reactive as you go down Group 1? Hint- Reactions are all about the movement of electrons!
A. They have fewer electrons in total
B. Their outer electrons are closer to the nucleus
C. The outer electron is further from the nucleus, so it is more easily lost.
D. The atoms become smaller and lose electrons more easily
C. The outer electron is further from the nucleus, so it is more easily lost
Which of the following is true about objects floating in fluids?
A. An object will float if it is denser than the fluid.
B. An object will float if it is less dense than the fluid.
C. An object will float if it is more massive than the fluid.
D. An object will float if the fluid has a higher temperature.
B. An object will float if it is less dense than the fluid.
When white light passes through a prism, why does each colour refract at a different angle?
A. Each colour has a different energy level, which affects how much it is bent.
B. Each colour has a different wavelength, and shorter wavelengths (violet) are refracted more than longer wavelengths (red).
C. The prism only bends red light and leaves other colours unchanged.
D. The different colours of light are absorbed at different rates by the prism, causing them to spread out.
B. Each colour has a different wavelength, and shorter wavelengths (violet) are refracted more than longer wavelengths (red).