Which gas do plants take in from the air for photosynthesis?
AnswerCarbon dioxide
Plants use carbon dioxide, water and light energy to make sugars, releasing oxygen.
Science · Facts & stats
Science facts & stats
7 fact-checked facts about science, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
What is the chemical symbol for gold?
AnswerAu
Au comes from the Latin aurum; Ag is silver.
Going deeper
About how fast does light travel in a vacuum?
AnswerAbout 300,000 km per second
Light in a vacuum travels at 299,792,458 metres per second, roughly 300,000 km/s.
Which subatomic particle carries a negative electric charge?
AnswerElectron
Electrons are negative, protons positive and neutrons neutral.
Which cell structure produces most of a cell's ATP through respiration?
AnswerMitochondria
Mitochondria carry out aerobic respiration, generating most of the cell's ATP energy.
Expert level
What is Avogadro's number, approximately?
Answer6.022 × 10²³
One mole of a substance contains about 6.022 × 10²³ particles.
What is absolute zero on the Celsius scale?
Answer−273.15°C
Absolute zero, 0 kelvin, equals −273.15°C, the lowest possible temperature.
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