How Oxygen Increased (OCR GCSE Chemistry A (Gateway Science Suite)): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
Around when did algae first appear on Earth?
Around when did algae first appear on Earth?
2.7 billion years ago
What process did early plant life use to increase oxygen in the atmosphere?
What process did early plant life use to increase oxygen in the atmosphere?
Photosynthesis
Which organisms first began to carry out photosynthesis?
Which organisms first began to carry out photosynthesis?
Algae and early plant life
What two substances does photosynthesis convert?
What two substances does photosynthesis convert?
Carbon dioxide and water
What are the two products of photosynthesis?
What are the two products of photosynthesis?
Glucose and oxygen
What energy source does photosynthesis use?
What energy source does photosynthesis use?
Sunlight
Over what timescale did oxygen build up in the atmosphere?
Over what timescale did oxygen build up in the atmosphere?
Millions of years
What did the buildup of oxygen enable?
What did the buildup of oxygen enable?
Development of more complex life forms
Which gas accumulated in the atmosphere as photosynthesis continued?
Which gas accumulated in the atmosphere as photosynthesis continued?
Oxygen
In the photosynthesis equation, how many molecules are produced?
In the photosynthesis equation, how many molecules are produced?
6