How Oxygen Increased (AQA GCSE Chemistry): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
Around how long ago did algae first appear on Earth?
Around how long ago did algae first appear on Earth?
2.7 billion years ago
Which organisms first began to carry out photosynthesis?
Which organisms first began to carry out photosynthesis?
Algae and early plant life
What energy source does photosynthesis use?
What energy source does photosynthesis use?
Sunlight
What are the two reactants in photosynthesis?
What are the two reactants in photosynthesis?
Carbon dioxide and water
What are the two products of photosynthesis?
What are the two products of photosynthesis?
Glucose and oxygen
In the photosynthesis equation, how many molecules are produced?
In the photosynthesis equation, how many molecules are produced?
6
What gas did photosynthesis steadily increase in the atmosphere?
What gas did photosynthesis steadily increase in the atmosphere?
Oxygen
How long did the buildup of oxygen in the atmosphere take?
How long did the buildup of oxygen in the atmosphere take?
Millions of years
What did the buildup of oxygen in the atmosphere enable?
What did the buildup of oxygen in the atmosphere enable?
Development of complex life forms
Why was the increase in oxygen crucial?
Why was the increase in oxygen crucial?
For the evolution of life