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Origin of life

ICSE · Class 12 · Biology

Flashcards for Origin of life — ICSE Class 12 Biology. Quick Q&A cards covering key concepts, definitions, and formulas.

59 questions37 flashcards5 concepts

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37 Flashcards
Card 1Universe and Earth

When did the Big Bang occur?

Answer

Approximately 10–20 billion years ago. It was a massive explosion of tightly condensed matter that gave rise to the universe.

Card 2Universe and Earth

When was the Earth formed?

Answer

Approximately 4.5 billion years ago, from condensing cosmic dust and gases (nebula).

Card 3Universe and Earth

What was the composition of the primitive atmosphere?

Answer

Hydrogen (H₂), Methane (CH₄), Ammonia (NH₃), Water vapour (H₂O). It was a REDUCING atmosphere with NO free oxygen (O₂). Mnemonic: HARM.

Card 4Universe and Earth

Why was the primitive atmosphere called 'reducing'?

Answer

Because it lacked free oxygen (O₂). The gases present (H₂, CH₄, NH₃) were reducing agents. This was essential for abiotic synthesis of organic molecules.

Card 5Universe and Earth

What is a nebula in the context of Earth's origin?

Answer

A swirling cloud of gases and cosmic dust that condensed under gravity to form the Sun and planets of our solar system.

Card 6Theories of Origin

What is the Theory of Special Creation?

Answer

Life was created by a supernatural being. All organisms appeared in their current form. Based on faith (Genesis, Hindu mythology). Not scientifically testable.

Card 7Theories of Origin

What is Spontaneous Generation (Abiogenesis)?

Answer

The theory that life arises from non-living organic matter without intervention of living organisms. Believed by Aristotle, Van Helmont. DISPROVED by Redi, Spallanzani, and Pasteur.

Card 8Theories of Origin

What is Biogenesis?

Answer

The doctrine that life arises only from pre-existing life. Proven by Redi, Spallanzani, and Pasteur. Accepted for all currently observed living organisms.

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Frequently Asked Questions

What are the important topics in Origin of life for ICSE Class 12 Biology?
Key topics in Origin of life include Origin of Life — Complete Concept Map, Experiments Disproving Spontaneous Generation — Timeline, Chemical Evolution to First Life — Complete Pathway. These are the concepts ICSE Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in Origin of life — ICSE Class 12 Biology?
Understand the core concepts first, then work through the 59 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
How many flashcards are available for Origin of life?
There are 37 flashcards for Origin of life covering key definitions, formulas, and concepts. Use them daily for 10–15 minutes for best results.

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Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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