Science Flashcards
7 cards from real ICAS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Science flashcards as text
Which of the following best describes a food web?
Answer: A network of interconnected food chains in an ecosystem
A food web shows the complex feeding relationships among multiple organisms in an ecosystem, with many overlapping food chains.
Water changes from a liquid to a solid when it is cooled to 0°C (32°F). This process is called:
Answer: Freezing
Freezing is the phase change from liquid to solid that occurs when water loses enough thermal energy at 0°C.
A student sets up an experiment with two identical plants. One receives water daily, the other does not. What is the independent variable?
Answer: Whether or not the plant receives water
The independent variable is the factor deliberately changed by the experimenter — in this case, whether the plant receives water.
Which of the following is a renewable source of energy?
Answer: Solar power
Solar power is renewable because sunlight is continuously available and cannot be depleted, unlike fossil fuels.
A ball is rolled along a smooth floor and eventually stops. The force that caused it to stop is:
Answer: Friction
Friction between the ball and the floor surface converts kinetic energy into heat, gradually slowing and stopping the ball.
Which organelle is known as the 'powerhouse of the cell' because it produces energy?
Answer: Mitochondria
Mitochondria produce ATP (adenosine triphosphate), the main energy currency of the cell, through cellular respiration.
Which of the following best describes a hypothesis?
Answer: A testable prediction about the outcome of an experiment
A hypothesis is a testable, educated prediction made before conducting an experiment, based on prior observations.