NCERT Solutions for Class 8 Science Chapter 13 Our Home Earth a Unique Life Sustaining Planet provide clear, step-by-step answers to every exercise and in-text question from the chapter Our Home Earth a Unique Life Sustaining Planet of the NCERT textbook Curiosity. Prepared by subject experts as per the latest NCERT (CBSE) syllabus for 2026-27, these NCERT Solutions for Class 8 Science help you understand each concept, write exam-ready answers, and check your own solutions. You can read them online below or download the free Class 8 Science Chapter 13 question-answer PDF.
NCERT Solutions for Class 8 Science Chapter 13 Our Home Earth a Unique Life Sustaining Planet
- Class: Class 8
- Subject: Science
- Chapter: Chapter 13 – Our Home Earth a Unique Life Sustaining Planet
- Textbook: Curiosity (NCERT)
- Study material: NCERT Solutions – questions with answers, free PDF
These solutions answer all the exercise questions of Chapter 13 Our Home Earth a Unique Life Sustaining Planet — including the in-text questions, short-answer and long-answer questions, and activities — with complete explanations so you can follow the method, not just the final answer. Read the full solutions below.
NCERT Solutions Class 8 Science Chapter 13 Our Home Earth a Unique Life Sustaining Planet View Download
NCERT Solutions for Class 8 Science Chapter 13 PDF Download
You can read the NCERT Solutions for Class 8 Science Chapter 13 online above, or download the complete question-answer PDF to study Our Home Earth a Unique Life Sustaining Planet offline at any time.
NCERT Solutions for Class 8 Science Chapter 13 PDF Download Link – Click Here to Download Solutions PDF
Questions Covered in This Chapter
These NCERT Solutions answer all 38 questions of this chapter. The questions solved are:
- What do you think Earth would look like if there were no life on it at all?
- Life on Earth has survived for billions of years. What allows it to keep going despite major changes and disasters?
- Why don’t dogs lay eggs? Or hens give birth to live chicks?
- If a spaceship carried soil and water to Mars, could plants start growing there?
- Have you ever wondered where all life on Earth actually exists?
- List some features of the Earth that we often take for granted, but are interesting and important to us. Write them in Table 13.1. We have filled in a few for you.
- Collect information about the temperature and size of the planets in the solar system, and check if they have an atmosphere. You may collect this information from books in your school library, trusted websites, or discuss with your teachers. Fill out the missing information in Table 13.2.
- Venus, the second planet from the Sun has the highest average temperature and is the hottest planet. Why is this so?
- Did Mars ever support life?
- Is the temperature or distance from the Sun, the only factor that makes the Earth habitable?
- What would happen if the size of the Earth were too small or too big?
- Does the magnetic field of the Earth have any role in sustaining life on Earth?
- But, how is life supported and sustained on Earth?
- Have you ever wondered how so many things on Earth stay in balance?
- But how can the same process lead both to similarity (an animal gives birth to similar individual, such as a cow gives birth to a cow) and variation (shows different characteristics like difference in colour and height of individuals of some kind)?
- How do bamboo and sugarcane grow into new plants? I have never seen their seeds.
- Can you observe and list some plants around you that grow this way?
- You might wonder if both parents pass on their genetic material for making a new organism, won’t the child end up with double the amount of instructions? And would not this keep doubling every generation?
- Take some parts of plants like stem cutting of a money plant, the ‘eyes’ of a sprouted potato, or a piece of ginger (Fig. 13.11b). Plant each of them separately in moist soil (not too deep). For money plant, you can just put a cutting in a glass container which makes it easy to observe. Make sure they get all the conditions they need to grow—like water, air, and sunlight. Watch them every day and note how many days it takes for roots stem and leaves to appear. Also observe when the first new leaf appears.
- What are the advantages and disadvantages of giving birth to young ones vs. laying eggs?
- Do you think animals like dogs, cows, or humans could lay eggs like birds? Why or why not?
- What is one major reason Mars cannot currently support life like Earth? (i) It has too many volcanoes. (ii) It is too close to the Sun. (iii) It lacks a thick atmosphere and liquid water. (iv) Its magnetic field is too strong.
- Which of these is an example of geodiversity? (i) Variety of bird chirping in a forest. (ii) Different landforms like mountains, valleys, and deserts. (iii) Changing weather during monsoons. (iv) Number of different types of fish in a pond.
- If the Earth were smaller with the same density, what might happen to its atmosphere? (i) It would become thicker and hotter. (ii) It would escape into space due to weaker gravity. (iii) It would become frozen. (iv) It would cause stronger winds.
- In sexual reproduction, why are offspring different from their parents? (i) They grow in different climates. (ii) They eat different food. (iii) They acquire new instructions after birth. (iv) They get mixed instructions (genes) from both parents.
- You notice tiny green plants growing in cracks on your school wall after the monsoon. Where do you think the seeds came from? What conditions helped these plants grow there?
- A city has recently cut down a large patch of forest to build new roads and buildings. Discuss the possible effects this could have on the local climate and biodiversity? How might this affect water availability or quality in the area?
- A friend says, “The Earth has always had climate changes in the past, so today’s global warming is nothing new.” How would you respond using what you’ve learnt in this and other chapters of your science book?
- Imagine Earth’s magnetic field suddenly disappeared. What kinds of problems could arise for life on Earth? Explain.
- You are tasked with designing a new settlement for humans on Mars. Name three things you would need to recreate from Earth to support human life there. Which of these do you think is the hardest to replicate, and why?
- In a village, the temperature has been increasing and rainfall has become unpredictable over the past few years. What could be causing this change? Suggest two ways the village could adapt to these new conditions.
- If there were no atmosphere on the Earth, would it affect life, temperature, and water on the planet? Explain.
- Discuss five examples of vegetative propagation.
- Design an ‘Earth Survival Kit’. Imagine you’re building a tiny model of Earth for another planet. What must it have to support life, and why?
- India is planning for a challenging lunar mission, Chandrayaan-4, which will bring back samples of soil from the Moon. If the Moon had water, could plants grow in that soil? Think of some experiment that could help you explore whether plant growth is possible on the Moon.
- Flowers are often brightly coloured and have a pleasant smell. How do you think these features help the plant reproduce?
- Why do animals like fish and frogs lay hundreds or even thousands of eggs at a time, while other animals lay only a few? What might be the advantages and disadvantages of laying so many eggs?
- Birds like sparrows build nests and care for their eggs and chicks, while reptiles like snakes usually lay their eggs and leave them without protection. How might this difference in parental care affect the chances of survival for the young ones in each case?
Chapter at a Glance
- All life on Earth exists in an astonishingly thin shell. From the highest peak to the deepest ocean trench is only about 20 km against an Earth radius of about 6400 km — if Earth were an apple, the crust would be the apple's skin.
- Earth lies in the habitable zone (or 'Goldilocks zone'), the range of distances from a star over which water stays liquid . Its nearly circular orbit keeps sunlight and heat steady through the year, so most places escape extreme summers and winters.
- Earth is also the right size . Its gravity is strong enough to hold on to the atmosphere — Mars's atmosphere is 100 times thinner and Mercury has none — but not so strong that our own weight would crush us.
- The atmosphere works in three ways: oxygen for respiration, the ozone layer (a three-atom form of oxygen) that blocks harmful ultraviolet rays, and a mild greenhouse effect in which gases like carbon dioxide absorb the radiation Earth gives off, keeping it warm enough for liquid water. On Venus a thick carbon dioxide atmosphere pushes the same effect to 450 °C.
- Molten iron moving in Earth's core is believed to give Earth its magnetic field , which deflects cosmic rays and the solar wind that would otherwise strip the atmosphere and thin the ozone layer.
- Life is sustained by the interaction of four systems — atmosphere (air), hydrosphere (water), geosphere (rock, soil and minerals) and biosphere (all living things and where they live). Damage to one reaches the others.
- Reproduction keeps life from disappearing. Asexual reproduction (vegetative propagation, budding in Hydra, regeneration in Planaria) gives exact copies; sexual reproduction combines half the instructions from each parent through gametes , so offspring are similar but never identical — and that variation lets life adapt.
- The triple planetary crisis — climate change, biodiversity loss and pollution — is now the biggest threat to that balance. The Paris Agreement (2015) set a goal of limiting global warming to below 1.5 °C; as of 2025 the world is not on track to meet it.
How to Download NCERT Solutions for Class 8 Science Chapter 13 PDF
Follow these simple steps to get the Our Home Earth a Unique Life Sustaining Planet questions-and-answers PDF from Curiosity.
- Search NCERT Solutions for Class 8 Science Chapter 13 aglasem and open this page.
- Read the exercise questions with answers for Our Home Earth a Unique Life Sustaining Planet shown above.
- Click the Download PDF link to save the Our Home Earth a Unique Life Sustaining Planet solutions to your device.
NCERT Solutions for Class 8 Science – All Chapters
There are more chapters to study besides Our Home Earth a Unique Life Sustaining Planet in Science. Here are the NCERT Solutions for all chapters of Class 8 Science.
- Chapter 1 Exploring the Investigative World of Science
- Chapter 2 The Invisible Living World Beyond Our Naked Eye
- Chapter 3 Health the Ultimate Treasure
- Chapter 4 Electricity Magnetic and Heating Effects
- Chapter 5 Exploring Forces
- Chapter 6 Pressure Winds Storms and Cyclones
- Chapter 7 Particulate Nature of Matter
- Chapter 8 Nature of Matter Elements Compounds and Mixtures
- Chapter 9 The Amazing World of Solutes Solvents and Solutions
- Chapter 10 Light Mirrors and Lenses
- Chapter 11 Keeping Time with the Skies
- Chapter 12 How Nature Works in Harmony
- Chapter 13 Our Home Earth a Unique Life Sustaining Planet
NCERT Solutions for Class 8 – All Subjects
Just like Chapter 13 of Science, you can get the exercise questions with answers for every other subject of Class 8. Here are the NCERT Solutions for all subjects of Class 8.
NCERT Solutions for Class 8 Science Chapter 13 – An Overview
The key highlights of this study material are as follows.
| Aspects | Details |
|---|---|
| Class | Class 8 |
| Subject | Science |
| Chapter Number | Chapter 13 |
| Chapter Name | Our Home Earth a Unique Life Sustaining Planet |
| Book Name | Curiosity |
| Book By | NCERT (National Council of Educational Research and Training) |
| Educational Resource Here | NCERT Solutions of Class 8 Science Chapter 13 for all exercises |
| More Questions Answers of This Subject | NCERT Solutions for Class 8 Science |
| Download Book Chapter | NCERT Book Class 8 Science |
| All Questions Answers For This Class | NCERT Solutions for Class 8 |
| Complete Solutions | NCERT Solutions |
NCERT Solutions for Class 8 Science Chapter 13 Our Home Earth a Unique Life Sustaining Planet – FAQs
What are the NCERT Solutions for Class 8 Science Chapter 13 Our Home Earth a Unique Life Sustaining Planet?
They are the complete, step-by-step answers to all the exercise and in-text questions of Chapter 13 Our Home Earth a Unique Life Sustaining Planet from the NCERT Class 8 Science textbook Curiosity, written by experts as per the latest NCERT syllabus.
How can I download the Class 8 Science Chapter 13 solutions PDF for free?
Open this page on aglasem, read the Our Home Earth a Unique Life Sustaining Planet questions with answers, and click the “Download Solutions PDF” link. The Class 8 Science Chapter 13 NCERT Solutions PDF is completely free to download.
Are these NCERT Solutions as per the latest 2026-27 syllabus?
Yes. The NCERT Solutions for Class 8 Science Chapter 13 are based on the latest NCERT textbook Curiosity and the current 2026-27 CBSE syllabus, so the questions and answers match what you study in class.
Where can I get NCERT Solutions for the other chapters of Class 8 Science?
You can find the answers to every chapter on the NCERT Solutions for Class 8 Science page, and solutions for every subject on the NCERT Solutions for Class 8 page.
How do NCERT Solutions help in exam preparation?
They show the correct method to solve each question, help you write answers the way they are expected in exams, let you check and correct your own work, and save revision time — which together improve your marks in Class 8 Science.
If you have any queries on NCERT Solutions for Class 8 Science Chapter 13 Our Home Earth a Unique Life Sustaining Planet, then please ask in the comments below.
