Class 12 Biology — Chapter 11: Organisms and Populations

What you'll learn

• ▸Ecology and Levels of Organisation
• ▸Population Attributes
• ▸Age Pyramids
• ▸Population Density
• ▸Factors Affecting Population Growth
• ▸Population Growth Equation

Chapter Summary

--- PAGE 1 --- Chapter 11 Organisms and Populations Chapter 12 Ecosystem Chapter 13 Biodiversity and Conservation Diversity is not only a characteristic of living organisms but also of content in biology textbooks. Biology is presented either as botany, zoology and microbiology or as classical and modern. The latter is a euphemism for molecular aspects of biology. Luckily we have many threads which weave the different areas of biological information into a unifying principle. Ecology is one such thread which gives us a holistic perspective to biology. The essence of biological understanding is to know how organisms, while remaining an individual, interact with other organisms and physical habitats as a group and hence behave like organised wholes, i.e., population, community, ecosystem or even as the whole biosphere. Ecology explains to us all this. A particular aspect of this is the study of anthropogenic environmental degradation and the socio-political issues it has raised. This …

Practice Questions from this Chapter

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1. Explain how organisms adapt to cold. Get Solution →
2. Describe a real-world food chain example. Get Solution →
3. Compare different ways populations grow. Get Solution →
4. Who is revered as the Father of Ecology in India according to the chapter? Get Solution →
5. Ecology, as described in the text, is basically concerned with how many levels of biological organisation? Get Solution →
6. In population dynamics, what does the term 'Natality' refer to? Get Solution →
7. What is the characteristic shape of a population growth curve under conditions of exponential growth? Get Solution →
8. Which two processes contribute to a decrease in population density? Get Solution →

Did you know?

• 💡 The largest living structure on Earth is the Great Barrier Reef, a massive ocean ecosystem.
• 💡 Trees can communicate and share nutrients through an underground network of fungi.
• 💡 Your body hosts trillions of bacteria, forming a complex ecosystem within you.
• 💡 Some species of ants form supercolonies spanning thousands of miles with millions of individuals.
• 💡 Aphids can reproduce without a mate, creating entire populations of female clones.

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