Science Flashcards
7 cards from real BECE 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
What is the main function of red blood cells?
Answer: Carry oxygen
Red blood cells contain hemoglobin, which binds to oxygen and transports it from the lungs to all tissues throughout the body.
Which layer of the Earth is the thinnest?
Answer: Crust
The Earth's crust is its thinnest layer, ranging from about 5 km under the oceans to 70 km under continents.
What happens to the speed of light as it moves from air into glass?
Answer: It decreases
Light slows down when passing from a less dense medium (air) to a more dense medium (glass), which also causes it to refract.
Which gas is produced during aerobic respiration in living organisms?
Answer: Carbon dioxide
Aerobic respiration breaks down glucose using oxygen and releases carbon dioxide, water, and energy (ATP).
What is the pH value of a neutral solution?
Answer: 7
A neutral solution, such as pure water, has a pH of 7; values below 7 are acidic and values above 7 are basic (alkaline).
Which organelle is known as the powerhouse of the cell?
Answer: Mitochondria
Mitochondria generate most of the cell's ATP through cellular respiration, earning them the nickname 'powerhouse of the cell'.
A scientist forms an explanation based on an observation before conducting an experiment. This is called a:
Answer: Hypothesis
A hypothesis is a testable, educated prediction or explanation proposed before an experiment is conducted.