Question Answer
Our Home Earth, a Unique Life Sustaining Planet Question Answer Practice
Our Home Earth, a Unique Life Sustaining Planet question answer practice for Class 8 Science revision.
4-minute audio preview
FAQ
What makes Earth's atmosphere important for life?
Earth's atmosphere contains oxygen for breathing and carbon dioxide for plants, and it protects living beings from harmful solar radiation. You can listen to detailed explanations on Harshali Academy.
Can plants grow naturally on Mars? Why or why not?
No, because Mars lacks a thick atmosphere and liquid water on its surface, making it too cold and exposed to radiation. Harshali Academy explains these challenges in the full chapter.
How do animals adapt to survive in different environments?
Animals evolve traits like thick fur for cold or water storage for deserts to survive. This adaptation process is described clearly in the chapter on Harshali Academy.
Why is liquid water essential for life on Earth?
Liquid water supports all biological processes and is necessary for survival of all organisms. Harshali Academy's audio lessons explain its role in sustaining life.
What role does evolution play in the survival of life on Earth?
Evolution allows species to adapt to environmental changes over time, ensuring survival despite disasters. This concept is covered in detail on Harshali Academy.
Important exam questions with answers
Why is Earth called a unique life-sustaining planet?
Earth lies in the habitable zone with the right temperature for liquid water, essential for life. Its atmosphere provides oxygen and protection from harmful radiation, making life possible.
Explain how life on Earth survives natural disasters like volcanic eruptions and ice ages.
Life survives because organisms adapt and evolve over time to changing conditions. Extremophiles can live in harsh environments, showing life's resilience.
What is the difference between oviparous and viviparous animals? Give examples.
Oviparous animals lay eggs, like hens and frogs, where the young develop outside the mother's body. Viviparous animals, like dogs and humans, give birth to live young developed inside the mother.
Key concepts from this chapter
- Earth is uniquely positioned in the habitable zone allowing liquid water to exist.
- Earth's atmosphere contains oxygen and carbon dioxide essential for life and protects from harmful solar radiation.
- Life on Earth has survived for billions of years due to adaptation and evolution.
- Different animals reproduce via oviparous (egg-laying) or viviparous (live birth) methods.
- Mars lacks the thick atmosphere and conditions necessary for natural plant growth despite having sunlight and carbon dioxide.
Question-answer focus
In the chapter "Our Home Earth, a Unique Life Sustaining Planet," students explore a fascinating classroom scene where a teacher invites them to imagine Earth without any life. This vivid exercise helps explain why Earth is so special among planets. The chapter highlights Earth's perfect distance from the Sun, its protective atmosphere, and the ability of life to adapt through evolution. Harshali Academy brings this chapter alive by making these scientific concepts easy to understand and engaging. By listening to the full chapter on Harshali Academy, students can deepen their grasp of why Earth remains the only known planet to support life. This question-answer page helps students practise likely doubts and exam responses from Our Home Earth, a Unique Life Sustaining Planet before downloading the full app.
Hindi explanation
अध्याय "हमारा घर पृथ्वी, एक अद्वितीय जीवन-समर्थक ग्रह" में हम सीखते हैं कि पृथ्वी क्यों जीवन के लिए अनोखी है। इसमें बताया गया है कि पृथ्वी सूर्य से सही दूरी पर है, इसकी वायुमंडल जीवन के लिए जरूरी है, और जीवों की अनुकूलन क्षमता इसे खास बनाती है। यह अध्याय कक्षा 8 के छात्रों के लिए महत्वपूर्ण है।
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