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NCERT Solutions

The Origin and Evolution of the Earth

CBSE · Class 11 · Geography

NCERT Solutions for The Origin and Evolution of the Earth — CBSE Class 11 Geography.

76 questions64 flashcards5 concepts

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11 Questions Solved · 1 Section

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EXERCISES

1(i)Which one of the following figures represents the age of the earth?Show solution
The age of the earth is about 4.6 billion years.

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1(ii)Which one of the following is not related to the formation or modification of the present atmosphere?Show solution
Differentiation is related to the evolution of the earth's interior, not to the formation or modification of the present atmosphere. The atmosphere was formed/modified by solar winds, degassing, and photosynthesis.

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1(iii)Life on the earth appeared around how many years before the present?Show solution
The chapter states that life began to evolve sometime 3,800 million years ago, which is 3.8 billion years before the present.

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2(i)What is meant by the process of differentiation?Show solution
Differentiation is the process by which the earth's material got separated into different layers according to their densities. Heavier materials like iron sank towards the centre, while lighter materials moved towards the surface, forming layers such as the crust, mantle, outer core, and inner core.

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2(ii)What was the nature of the earth surface initially?Show solution
Initially, the earth's surface was barren, rocky, and hot. It was a very unfriendly surface with a thin atmosphere of hydrogen and helium.

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2(iii)What were the gases which initially formed the earth's atmosphere?Show solution
The earth's early atmosphere initially consisted mainly of hydrogen and helium.

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3(i)Write an explanatory note on the 'Big Bang Theory'.
3(ii)List the stages in the evolution of the earth and explain each stage in brief.
(i)Which is the agency that has launched this project?
(ii)Why are scientists interested in collecting Stardust?
(iii)Where from the Stardust is being collected?

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Frequently Asked Questions

What are the important topics in The Origin and Evolution of the Earth for CBSE Class 11 Geography?
The Origin and Evolution of the Earth covers several key topics that are frequently asked in CBSE Class 11 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in The Origin and Evolution of the Earth — CBSE Class 11 Geography?
Understand the core concepts first, then work through the 76 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
Where can I get free NCERT Solutions for The Origin and Evolution of the Earth Class 11 Geography?
This page has free step-by-step NCERT Solutions for every exercise question in The Origin and Evolution of the Earth (CBSE Class 11 Geography) — written the way examiners award marks: given, formula, working, answer.

Sources & Official References

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

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