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Evolution

Jammu & Kashmir Board · Class 12 · Biology

Quick revision notes for Evolution — Jammu & Kashmir Board Class 12 Biology. Key concepts, formulas, and definitions for last-minute revision.

44 questions96 flashcards5 concepts

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A comparison scene showing the population of light and dark peppered moths on tree trunks in a rural (pre-industrial) and an industrial (post-industrial) environment, illustrating natural selection.
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Key Topics to Revise

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1. Origin of Life

  • The universe is almost 13.8 billion years old.
  • Earth was formed about 4.5 billion years back in the solar system of the milky way galaxy.
  • Life appeared 500 million years after the formation of earth, i.e., almost four billion years back.
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2. Evolution of Life Forms

  • Charles Darwin proposed the theory of evolution by natural selection based on observations made during a sea voyage in H.M.S. Beagle.
  • Darwin’s theory rests on two key concepts: branching descent and natural selection.
  • The fitness, according to Darwin, refers ultimately and only to reproductive fitness.
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3. Evidences for Evolution

  • Fossils are remains of hard parts of life forms found in rocks.
  • Different-aged rock sediments contain fossils of different life forms.
  • Fossils show that life forms changed over time and that some organisms became extinct.
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4. Adaptive Radiation and Convergent Evolution

  • Adaptive radiation is the evolution of different species in a given geographical area starting from a point and radiating into different habitats.
  • Darwin’s finches are a classic example of adaptive radiation.
  • Australian marsupials are another example of adaptive radiation.

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Key Concepts

The universe is almost 13Spontaneous generation was the ideaOparin and Haldane proposed thatCharles DarwinIndividuals with heritable variations that help

Frequently Asked Questions

What are the important topics in Evolution for Jammu & Kashmir Board Class 12 Biology?
Evolution covers several key topics that are frequently asked in Jammu & Kashmir Board Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Evolution — Jammu & Kashmir Board Class 12 Biology?
Understand the core concepts first, then work through the 44 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

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

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