Our Home Earth A Unique Life Sustaining Planet Class 8 Long Question Answer

Our Home Earth A Unique Life Sustaining Planet Class 8 Long Question Answer

Our Home Earth A Unique Life Sustaining Planet Class 8 Long Question Answer

Question 1.

What are the different methods of plant reproduction, and how do they differ from each other?

Answer:

Plants can reproduce through two main methods: asexual and sexual reproduction.

1. Asexual reproduction involves a single parent and includes methods like vegetative propagation, where parts of the plant, such as stems or roots, can grow into new plants (e.g., money plants and potatoes).
2. In sexual reproduction requires two parents (male and female), where specialised reproductive cells called gametes combine to form a new organism, resulting in offspring that have genetic variations from both parents.

Question 2.

Why is Earth considered a unique life-sustaining planet, and what factors contribute to its habitability?

Answer:

Earth is unique because it is located in the habitable zone, or 'Goldilocks zone,' where conditions are just right for liquid water to exist, which is essential for life. Factors contributing to its habitability include its distance from the Sun, a suitable atmosphere, and a diverse range of ecosystems that support various life forms. Additionally, the balance between land, air, water, and living organisms creates a stable environment where life can flourish.

Question 3.

How do living organisms depend on each other and their environment for survival?

Answer:

Living organisms interact with each other and their environment in a complex web of relationships that support life. For example, plants produce food through photosynthesis, which serves as a primary energy source for herbivores, while carnivores depend on herbivores for sustenance. Decomposers play a crucial role by breaking down dead matter, returning essential nutrients to the soil, thus maintaining the balance of ecosystems and ensuring that all forms of life can continue to thrive.

Examples from real life

Question 1.

The Amazon Rainforest: The Lungs of the Earth

Answer:

The Amazon Rainforest is often referred to as the 'lungs of the Earth' because it produces a significant amount of the world's oxygen through the process of photosynthesis. This vast and biodiverse ecosystem is home to millions of species, including plants, animals, and microorganisms. The rainforest plays a crucial role in regulating the Earth's climate by absorbing carbon dioxide, a greenhouse gas, thus helping to mitigate climate change.

Question 2.

Coral Reefs: Biodiversity Hotspots

Answer:

Coral reefs are another remarkable example of Earth's unique life-sustaining capabilities. Often referred to as the 'rainforests of the sea,' coral reefs support an incredible diversity of marine life. They provide habitat and shelter for many species of fish, invertebrates, and other marine organisms. Coral reefs also protect coastlines from erosion and storm damage, acting as natural barriers. However, they are sensitive to changes in temperature and water quality, making them vulnerable to climate change and pollution.