Origin of life — Flashcards
ICSE · Class 12 · Biology
34 flashcards for Origin of life (ICSE Class 12 Biology) to test yourself on key terms and facts. Sample: "What is life?"
Interactive on Super Tutor
Studying Origin of life? Get the full interactive chapter.
Quizzes, flashcards, AI doubt-solver and a step-by-step study plan — built for flashcards and more.
Free trial, no card needed.
What is life?
Answer
Life is the power that an organism possesses to maintain and reproduce itself. This includes growth, metabolism, response to the environment, and reproduction.
What is the Big Bang Theory?
Answer
The Big Bang Theory explains the origin of the universe. It states that the cosmos began with a massive explosion of tightly condensed matter and then expanded.
How old is the cosmos believed to be?
Answer
The cosmos is believed to have originated about 10 to 20 billion years ago.
How many galaxies are estimated to exist in the universe?
Answer
There are approximately 100,000 million galaxies in the universe.
Where is the Sun located in the Milky Way?
Answer
The Sun lies about two-thirds of the way from the centre of the Milky Way. It is a medium-sized star in our galaxy.
How did early Earth differ from present Earth?
Answer
Early Earth had a very high temperature, around 5000 to 6000 degrees Celsius, and a reducing atmosphere with no free oxygen. Later it cooled, and its present crust developed after about 750 million ye…
Why is Venus not suitable for life?
Answer
Venus is too hot to support even primitive forms of life. Its high carbon dioxide levels cause a strong greenhouse effect, which raises the temperature greatly.
Why could Mars not retain enough carbon dioxide?
Answer
Mars could not retain carbon dioxide because of its small gravitational field. As a result, it could not hold the solar energy trapped by the gas.
+26 more flashcards
Practise AllFrequently Asked Questions
What are the important topics in Origin of life for ICSE Class 12 Biology?
How many flashcards are available for Origin of life?
How should I revise Origin of life for the ICSE Class 12 board exam?
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
More resources for Origin of life
Practice Quiz
Test yourself with a quick quiz
Important Questions
Exam-style questions with answers
Revision Notes
Key points for last-minute revision
Chapter Summary
Understand the chapter at a glance
Concept Maps
See how topics connect
Study Plan
Step-by-step plan for this chapter
Syllabus
What topics to cover
For serious students
Get the full Origin of life chapter — start free.
Quizzes, flashcards, an AI doubt solver and a study plan for ICSE Class 12 Biology. Free to start, no card needed.