A. The food chain in an ecosystem helps to maintain
(a) flow of energy in the ecosystem
(b) passage of nutrients in the ecosystem
(c) the feeding relationship in nature, thus biodiversity
(d) all of the above
B. The interdependence of the living organisms among themselves and with the environment is called
(a) ecosystem (b) ecology
(c) chemistry (d) biology
C. Ecosystem consists of
(a) abiotic components
(b) biotic and abiotic components
(c) biotic components
(d) none of the above
D. Write a brief note on biodiversity and ecosystem diversity.
E. Explain the evolution of diverse species in an ecosystem.
The Correct Answer and Explanation is :
A. The food chain in an ecosystem helps to maintain
(d) all of the above
Explanation: The food chain plays a vital role in the functioning of an ecosystem. It maintains the flow of energy by transferring energy from producers (plants) to primary consumers (herbivores) and further up to secondary and tertiary consumers (carnivores). It also facilitates the passage of nutrients as decomposers break down dead organisms, releasing essential nutrients back into the environment. Additionally, the food chain reflects the feeding relationships among organisms, contributing to biodiversity by supporting various species and ecological interactions.
B. The interdependence of the living organisms among themselves and with the environment is called
(a) ecosystem
Explanation: An ecosystem refers to the interaction between living organisms (biotic factors) and their physical environment (abiotic factors). These interactions are essential for sustaining life and ensuring the flow of energy, cycling of nutrients, and overall balance within the environment.
C. Ecosystem consists of
(b) biotic and abiotic components
Explanation: An ecosystem includes both biotic components (living organisms like plants, animals, and microorganisms) and abiotic components (non-living factors such as air, water, soil, and sunlight). These components interact with each other, and their balance is crucial for the health and stability of the ecosystem.
D. Biodiversity and Ecosystem Diversity
Biodiversity refers to the variety of life on Earth, encompassing genetic, species, and ecosystem diversity. It is crucial for ecosystem functioning, resilience, and adaptation to changes. A biodiverse ecosystem supports a wide range of organisms, providing various ecological services such as pollination, water purification, and climate regulation.
Ecosystem diversity, a part of biodiversity, refers to the variety of ecosystems present in a given area, such as forests, wetlands, deserts, and marine environments. Each ecosystem has unique environmental conditions and species, contributing to the overall biodiversity of the planet. A diverse range of ecosystems ensures the stability of global processes and allows species to thrive in different habitats.
E. Evolution of Diverse Species in an Ecosystem
The evolution of diverse species in an ecosystem is driven by natural selection, genetic variation, and environmental factors. As organisms adapt to their environment over time, they develop traits that increase their chances of survival and reproduction. This process leads to speciation, the formation of new species. For example, variations in beak size among finches in the Galápagos Islands demonstrate how different environmental conditions, such as food availability, influence evolutionary changes in species.
Evolution also promotes biodiversity by allowing species to fill various ecological niches. Each species adapts to a specific role within the ecosystem, such as herbivores, carnivores, or decomposers. This specialization enables multiple species to coexist without directly competing for the same resources, thus supporting a diverse and stable ecosystem.
Furthermore, ecosystems evolve over time through ecological succession, where the structure and composition of communities change gradually. As species interact, they may alter the habitat, creating opportunities for new species to evolve and thrive. This ongoing process of evolution and adaptation results in the diversity of life forms within ecosystems, promoting ecological balance and resilience.