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Important Questions

Organisms and Populations

ICSE · Class 12 · Biology

Most important questions from Organisms and Populations for ICSE Class 12 Biology board exam 2026. MCQs, short answer, and long answer questions with marks.

60 questions38 flashcards

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An illustration showcasing various examples of commensalistic relationships, such as an orchid on a mango branch, barnacles on a whale, and cattle egret with grazing cattle.
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60 Questions·
multiple choice

Sample Questions

1multiple choice

The J-shaped growth curve of a population represents:

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Exponential growth

Exponential (J-shaped) growth occurs when resources are unlimited and every individual reproduces at maximum rate. The population grows faster and faster over time, giving a J-curve.

2multiple choice

The S-shaped growth curve of a population is called:

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Logistic growth curve

Logistic (S-shaped or sigmoid) growth occurs when resources are limited. Growth is initially exponential, then slows as the population approaches the carrying capacity (K), forming an S-curve.

3multiple choice

Carrying capacity (K) refers to:

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The maximum population size an environment can sustain indefinitely

Carrying capacity (K) is the maximum population size that a given environment can support indefinitely, given the food, water, shelter, and other resources available.

4multiple choice

In mutualism, the relationship between two species is:

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Both species benefit

Mutualism is a symbiotic relationship where both species benefit. Examples include pollination (insect gets nectar, plant gets pollinated) and mycorrhizal associations.

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Frequently Asked Questions

What are the important topics in Organisms and Populations for ICSE Class 12 Biology?
Key topics in Organisms and Populations include Population Growth Models Comparison, Population Interactions Summary Table, Population Attributes and Measurement Methods. These are the concepts ICSE Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in Organisms and Populations — ICSE Class 12 Biology?
Understand the core concepts first, then work through the 60 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
How many important questions are there in Organisms and Populations?
There are 60 practice questions available for Organisms and Populations. These cover multiple question types including MCQs, short answer, and long answer questions.

Sources & Official References

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

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