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Biology - Habitats, ecosystems, and adaptations

Grade 4IGCSE

Review the key concepts, formulae, and examples before starting your quiz.

🔑Concepts

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A Habitat is the specific environment where an organism lives, providing it with food, water, shelter, and space to survive.

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An Ecosystem consists of all the living organisms (biotic factors) in a particular area interacting with their non-living (abiotic factors) environment, such as H2OH_2O, soil, and sunlight.

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Adaptations are special features or behaviors that allow an organism to survive in its habitat. These can be structural (e.g., a polar bear's thick fur) or behavioral (e.g., bird migration).

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Producers are organisms, usually plants, that make their own food using energy from the Sun through the process of photosynthesis: 6CO2+6H2O→LightC6H12O6+6O26CO_2 + 6H_2O \xrightarrow{Light} C_6H_{12}O_6 + 6O_2.

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Consumers are organisms that cannot make their own food and must eat other plants or animals to obtain energy.

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A Food Chain shows the flow of energy from one organism to another. It always starts with a producer: Producer→Primary Consumer→Secondary ConsumerProducer \rightarrow Primary\ Consumer \rightarrow Secondary\ Consumer.

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Abiotic factors such as temperature (∘C^{\circ}C), light intensity, and the availability of oxygen (O2O_2) determine which organisms can survive in a specific habitat.

📐Formulae

6CO2+6H2O+light energy→C6H12O6+6O26CO_2 + 6H_2O + \text{light energy} \rightarrow C_6H_{12}O_6 + 6O_2

EnergySun→Producers→Consumers→Decomposers\text{Energy}_{Sun} \rightarrow \text{Producers} \rightarrow \text{Consumers} \rightarrow \text{Decomposers}

Growth=Energy Consumed−(Energy for Movement+Energy for Heat+Waste)\text{Growth} = \text{Energy Consumed} - (\text{Energy for Movement} + \text{Energy for Heat} + \text{Waste})

💡Examples

Problem 1:

Identify two structural adaptations of a camel that allow it to survive in a desert habitat with high temperatures and little H2OH_2O.

Solution:

  1. Large, flat feet. 2. A hump that stores fat.

Explanation:

Large, flat feet provide a greater surface area to prevent sinking into the sand. The hump stores fat, which can be broken down into energy and H2OH_2O when food and water are scarce.

Problem 2:

In a pond ecosystem, if the population of algae (producers) decreases due to lack of sunlight, what happens to the population of small fish (primary consumers)?

Solution:

The population of small fish will likely decrease.

Explanation:

Since small fish rely on algae for energy, a decrease in the producer level means there is less energy available for the Primary ConsumerPrimary\ Consumer. This leads to starvation or migration, causing the population to drop.

Problem 3:

Label the components of this food chain: Grass→Grasshopper→FrogGrass \rightarrow Grasshopper \rightarrow Frog.

Solution:

Grass=ProducerGrass = Producer, Grasshopper=Primary ConsumerGrasshopper = Primary\ Consumer, Frog=Secondary ConsumerFrog = Secondary\ Consumer.

Explanation:

The grass captures energy from the Sun. The grasshopper eats the grass (herbivore), and the frog eats the grasshopper (carnivore).

Habitats, ecosystems, and adaptations Revision - Grade 4 Science IGCSE