Ecology: population dynamics — KCSE Biology

KCSE Biology · 68 practice questions · 3 syllabus objectives

19 easy27 medium22 hard

What You'll Learn

Key learning outcomes for this topic, aligned to the KNEC KCSE syllabus.

Describe factors controlling population size (limiting factors)

Interpret population growth curves (sigmoid and J-shaped)

Ecology: population dynamics

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easySHORT ANSWER4 marks

List four abiotic factors that can affect the population dynamics of aquatic organisms in a freshwater ecosystem. (4 marks)

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Part (a) — 4 marks

Water temperature (1 mk)

Dissolved oxygen levels (1 mk)

pH levels (1 mk)

Nutrient availability (e.g., nitrogen and phosphorus) (1 mk)

easySHORT ANSWER2 marks

Name two examples of biotic factors that can limit the growth of a plant population. (2 marks)

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Part (a) — 2 marks

Herbivory by animals (1 mk)

Competition with other plant species (1 mk)

easySHORT ANSWER3 marks

List three density-dependent factors that can influence the population size of a species in a particular ecosystem. (3 marks)

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Part (a) — 3 marks

Competition for resources (1 mk)

Predation (1 mk)

Disease spread among individuals (1 mk)

Distinguish between a community and a population.

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