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Revision Notes

Coral Reefs

ICSE · Class 11 · Geography

Quick revision notes for Coral Reefs — ICSE Class 11 Geography. Key concepts, formulas, and definitions for last-minute revision.

65 questions22 flashcards5 concepts

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Key Topics to Revise

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1. Coral and Coral Polyps

  • Coral is a type of calcareous rock made of skeletons of minute sea organisms called polyps.
  • Polyps extract calcium from sea water to build skeletons that protect their bodies.
  • There are about 2,500 species of coral polyps.
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2. Conditions Favourable for Coral Reefs

  • Coral polyps require a temperature of 20°C to 30°C for growth.
  • Coral reefs are generally found between 30°N and 30°S latitudes.
  • They need sufficient sunlight and live at depths of 45 to 55 metres.
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3. Types of Coral Reefs

  • Three types of coral reefs are generally recognised: fringing reef, barrier reef, and atoll.
  • These types differ in position, shape, lagoon development, and distance from the coast.
  • Fringing reef grows along the coast of a continent or an island.
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4. Fringing Reef

  • Fringing reef is a coral platform built along the coast of a continent or an island.
  • It is a narrow belt with a steep slope towards the sea and a gentle slope towards the land.
  • Its width varies from 0.5 km to 2.5 km.

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Full Notes

Key Concepts

Coral is a type of calcareousWhen polyps dieCoral polyps need a temperatureCoral reefs are generally found betweenA fringing reef is a coral

Frequently Asked Questions

What are the important topics in Coral Reefs for ICSE Class 11 Geography?
Coral Reefs covers several key topics that are frequently asked in ICSE 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 Coral Reefs — ICSE Class 11 Geography?
Understand the core concepts first, then work through the 65 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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