Test: How Nature Works in Harmony - Class 8 MCQ

Deforestation leads to the destruction of habitats, which can cause the loss of species and disrupt the ecological balance. It affects both the biotic and abiotic components of ecosystems, leading to long-term environmental issues.

Pollution can severely decrease oxygen levels in water bodies, leading to the decline of aquatic life. This can disrupt the entire ecosystem, affecting not just the organisms but also the food sources that depend on them.

A population is defined as a group of individuals of the same species living together in a specific habitat at a given time. This concept is essential for understanding species dynamics and interactions.

Overfishing can lead to a decline in fish populations, which disrupts the food web by allowing other species, like dragonflies, to thrive unchecked. This can lead to a decrease in pollinators, affecting plant reproduction.

Higher species diversity usually supports greater ecosystem health by providing various functions and interactions that help maintain ecological stability, resilience, and sustainability.

Water is an abiotic component, meaning it is a non-living factor that influences the ecosystem. Abiotic components, including air, soil, and temperature, are crucial for supporting life.

Producers, such as plants, are vital as they create their own food through photosynthesis, forming the base of the food chain and providing energy for consumers.

A food chain illustrates the direct feeding relationships between organisms, showing how energy is transferred from one organism to another. For example, grass is eaten by a hare, which is then eaten by a tiger.

Herbivores play a crucial role in ecosystems by consuming plants, which helps transfer energy from producers to higher trophic levels, such as carnivores. This interaction is vital for the energy flow within the ecosystem.

A food web represents the complex and interconnected feeding relationships among various organisms in an ecosystem. It illustrates how multiple food chains overlap, showing the intricate balance of energy flow.

A habitat is defined as a place that provides the right conditions for an organism to live and grow. It includes both the living and non-living components necessary for survival.

Communities can protect ecosystems by establishing protected areas, such as national parks and wildlife sanctuaries, and by promoting conservation efforts. This collective action is vital for preserving biodiversity and maintaining ecological balance for future generations.

An ecosystem is defined by the interaction of both living (biotic) and non-living (abiotic) components in a particular area, forming a balanced system where each part plays a role in supporting life.

Decomposers, such as fungi and bacteria, are essential for breaking down dead plants and animals, returning important nutrients to the soil. This process helps maintain ecological balance by ensuring that nutrients are reused within the ecosystem.

Mutualism is a type of interaction where both organisms involved benefit from the relationship. An example is bees pollinating flowers while obtaining nectar, benefiting both the plants and the bees.

When the balance of an ecosystem is disturbed, it can lead to a series of cascading effects, where changes in one species or component can impact many others, resulting in significant ecological shifts.

Biodiversity enhances ecosystem stability and resilience by providing various roles and interactions among species, which helps maintain ecological balance and supports survival.

Plants interact with abiotic components by requiring sunlight for photosynthesis, which is essential for their growth and energy production. This interaction is critical for their survival and for sustaining the ecosystem.

Ecological balance is crucial as it maintains stability within ecosystems, supporting biodiversity and ensuring that various species can coexist and interact in a sustainable manner.

Migratory birds are known for traveling thousands of kilometers between different habitats, often to avoid harsh climates or to find food. This movement plays a crucial role in ecosystem balance and health.