How Nature Works in Harmony Class 8 Long Question Answer

How Nature Works in Harmony Class 8 Long Question Answer

How Nature Works in Harmony Class 8 Long Question Answer

Question 1.

What are the key differences between natural and human-made ecosystems, and how do these differences impact biodiversity?

Answer:

Natural ecosystems, such as forests and grasslands, evolve independently and maintain a balance of biodiversity through complex interactions among species. In contrast, human-made ecosystems, like farms and parks, require human management and often prioritise specific species for economic gain, which can lead to reduced biodiversity. This imbalance can harm ecosystem resilience and disrupt essential ecological processes.

Question 2.

How do sustainable farming practices contribute to the health of ecosystems, and what are some examples of these practices?

Answer:

Sustainable farming practices, such as crop rotation, organic fertilisers, and integrated pest management, enhance soil health, reduce chemical runoff, and promote biodiversity. These methods help maintain ecological balance by supporting beneficial organisms and preventing soil degradation, ultimately leading to healthier ecosystems. For example, planting cover crops can improve soil structure and prevent erosion while providing habitat for wildlife.

Question 3.

In what ways do biotic and abiotic components interact within an ecosystem, and why is this interaction crucial for sustaining life?

Answer:

Biotic components, like plants and animals, interact with abiotic components, such as soil, water, and sunlight, to create a balanced ecosystem. For instance, plants utilise sunlight and carbon dioxide to produce oxygen and food, while animals depend on plants for nourishment. This interdependence is crucial for sustaining life, as it ensures the flow of energy and nutrients necessary for all organisms to thrive.

Examples from real life

Question 1.

Coral reefs and Zooxanthellae

Answer:

Coral reefs are one of the most vibrant ecosystems on Earth, and they provide an excellent example of mutualism. Coral polyps, which are tiny marine animals, have a symbiotic relationship with zooxanthellae, a type of algae. The zooxanthellae live within the coral's tissues and perform photosynthesis, converting sunlight into energy. In return, the coral provides the algae with a protected environment and the compounds necessary for photosynthesis.

Question 2.

The African acacia tree and ants

Answer:

In the savannas of Africa, the acacia tree has developed a fascinating relationship with certain species of ants. The tree produces nectar and provides hollow thorns that serve as homes for the ants. In exchange for these resources, the ants aggressively protect the acacia tree from herbivores, such as elephants and other animals that might eat its leaves. This mutualistic relationship enhances the survival of both species, as the tree benefits from reduced herbivory, while the ants gain food and shelter.

Question 3.

Beavers and wetland ecosystems

Answer:

Beavers are known as ecosystem engineers because of their ability to alter their environment. By building dams in rivers and streams, beavers create ponds that can transform the landscape. These ponds provide habitats for a variety of species, including fish, amphibians, and birds. The increased water levels also help to recharge groundwater and improve water quality by filtering pollutants. This interaction between beavers (biotic) and the water systems (abiotic) demonstrates how one species can have a profound impact on the ecosystem, promoting biodiversity and enhancing the health of the environment.