TCAP Science Concepts 2 — Questions and Answers
Question 1: Which organelle is responsible for producing energy (ATP) in a cell through cellular respiration?
- Ribosome
- Mitochondria (Correct answer)
- Chloroplast
- Vacuole
Correct answer: Mitochondria
Mitochondria are known as the powerhouse of the cell because they produce ATP through cellular respiration.
Question 2: A student observes that iron rusts when left outside in the rain. This is an example of what type of change?
- Physical change
- Nuclear change
- Chemical change (Correct answer)
- Mechanical change
Correct answer: Chemical change
Rusting is a chemical change because iron reacts with oxygen and water to form a new substance, iron oxide.
Question 3: Which type of rock forms when magma cools and solidifies?
- Sedimentary
- Metamorphic
- Organic
- Igneous (Correct answer)
Correct answer: Igneous
Igneous rocks form when magma (underground) or lava (above ground) cools and crystallizes.
Question 4: What happens to the particles in a liquid when it is heated to its boiling point?
- They slow down and pack closer together
- They gain enough energy to escape into the gas phase (Correct answer)
- They lose all energy and stop moving
- They become solids immediately
Correct answer: They gain enough energy to escape into the gas phase
At the boiling point, liquid particles absorb enough energy to overcome intermolecular forces and transition to the gaseous state.
Question 5: In a food web, which organisms are always at the base (first trophic level)?
- Carnivores
- Decomposers
- Producers (plants) (Correct answer)
- Omnivores
Correct answer: Producers (plants)
Producers, such as plants and algae, form the base of all food webs because they convert sunlight into chemical energy through photosynthesis.
Question 6: The force of gravity between two objects increases when which of the following occurs?
- The distance between them increases
- The mass of one or both objects increases (Correct answer)
- The objects move faster
- The temperature rises
Correct answer: The mass of one or both objects increases
According to Newton's law of universal gravitation, gravitational force increases as the mass of either object increases.
Question 7: Which of the following best describes the process of condensation?
- Water vapor cools and turns into liquid water (Correct answer)
- Liquid water heats up and becomes steam
- Ice melts into liquid water
- Water seeps into the ground
Correct answer: Water vapor cools and turns into liquid water
Condensation occurs when water vapor loses heat energy and changes from a gas into liquid water, such as dew forming on grass.
TCAP Science Concepts 2
Which organelle is responsible for producing energy (ATP) in a cell through cellular respiration?