Our Home: Earth, A Unique Life Sustaining Planet Class 8 Worksheet with Answers Science Chapter 13 - #NCSOLVE 📚

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Class 8 Science Chapter 13 Our Home: Earth, A Unique Life Sustaining Planet Worksheet

Class 8 Our Home: Earth, A Unique Life Sustaining Planet Worksheet

Worksheet On Our Home: Earth, A Unique Life Sustaining Planet Class 8 – Our Home: Earth, A Unique Life Sustaining Planet Worksheet Class 8

A. Objective Type Questions

Multiple Choice Questions

Question 1.
Scientists use satellites to take pictures of the Earth. These images are made by joining many small pictures and adding false colours to show useful information. Which of the following can be studied using such images?
(a) Temperature of the Moon
(b) Earth’s underground caves
(c) Wind patterns and ocean life
(d) Strength of volcanoes
Answer:
(c) Wind patterns and ocean life

Question 2.
Earth is considered special among all planets known to us because it has certain features that allow life to exist. Which one of the following explains this uniqueness best?
(a) It is the largest and fastest-spinning planet
(b) Its outer layer is made of solid rock
(c) It has mountains, deserts, and oceans only
(d) It is the only known planet where life can survive
Answer:
(d) It is the only known planet where life can survive

Question 3.
All living beings on Earth live on a very thin surface layer compared to the whole planet. This outer layer is important for supporting life. Which term is used for this layer?
(a) Core
(b) Mantle
(c) Crust
(d) Tectonic plate
Answer:
(c) Crust

Question 4.
Earth, just like a fruit with skin, flesh, and seed, is made up of three main layers from outside to inside. Choose the correct sequence of these layers.
(a) Core → Mantle → Crust
(b) Mantle → Crust → Core
(c) Crust → Mantle → Core
(d) Crust → Core → Mantle
Answer:
(c) Crust → Mantle → Core

Question 5.
Venus experiences extremely high surface temperatures. Which of the following explains the main reason behind this extreme condition?
(a) Venus is too close to the asteroid belt
(b) The planet has no solid surface to hold temperature
(c) A thick layer of carbon dioxide traps most of the heat
(d) Venus rotates too quickly, which generates internal heat
Answer:
(c) A thick layer of carbon dioxide traps most of the heat

Question 6.
The greenhouse effect is a natural process that plays an important role in maintaining Earth’s temperature. Which of the following describes how this effect works?
(a) Sunlight is fully reflected back into space before reaching the Earth’s surface
(b) Infrared heat escapes easily through the Earth’s atmosphere into space
(c) Gases like carbon dioxide trap heat and prevent it from escaping into space
(d) Solar wind heats up the Earth’s surface by direct energy transfer
Answer:
(c) Gases like carbon dioxide trap heat and prevent it from escaping into space

Question 7.
Earth is said to be in the “Goldilocks zone’ which makes it just right for life to exist.
Which feature of this zone allows Earth to support life?
(a) Constant volcanic activity and thick clouds
(b) The presence of mountains and valleys
(c) A distance from the Sun that allows water to stay in liquid form
(d) Continuous solar radiation from solar flares
Answer:
(c) A distance from the Sun that allows water to stay in liquid form

Question 8.
Which harmful rays coming from the Sun are mostly blocked by Earth’s magnetic field?
(a) UV rays
(b) Cosmic rays
(c) X-rays
(d) Infrared rays
Answer:
(b) Cosmic rays

Question 9.
Earth stays livable because different natural parts work together. What happens when one part, like forests, is disturbed?
(a) Only animals are affected
(b) Nothing changes much
(c) It can impact air, water, and other living things
(d) Soil becomes fertile
Answer:
(c) It can impact air, water, and other living things

Question 10.
Living things that break down dead matter and return nutrients to soil are an important part of nature. What are they known as?
(a) Consumers
(b) Decomposers
(c) Herbivores
(d) Pollinators
Answer:
(b) Decomposers

Question 11.
Life continues on Earth from one generation to the next mainly because of a natural process. Which process helps in this continuity?
(a) Digestion
(b) Reproduction
(c) Photosynthesis
(d) Circulation
Answer:
(b) Reproduction

Question 12.
A calf looks like a cow because it receives certain instructions from its parent.
What are these instructions called?
(a) Proteins
(b) Enzymes
(c) Genes
(d) Organs
Answer:
(c) Genes

Question 13.
Over time, some animals like camels developed features such as humps to survive. This is possible because of
(a) Reproduction without change
(b) Changes passed over generations
(c) Use of external tools
(d) Sudden accidents
Answer:
(b) Changes passed over generations

Question 14.
How does a bird embryo survive after the egg is laid?
(a) Parent feeds it
(b) Air gives nutrients
(c) From stored food in egg
(d) Absorbs from nest
Answer:
(c) From stored food in egg

Assertion-Reason Questions

The questions given below consist of an Assertion and a Reason. Based on that, choose the appropriate option.
(a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
(b) Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
(c) Assertion is true, but Reason is false.
(d) Assertion is false, but Reason is true.

Question 1.
Assertion: The crust is the thickest layer of Earth and lies below the mantle.
Reason: Earth is made of three main layers crust, mantle, and core each with different properties.
Answer:
(d) A is false, but R is true. The crust is the thinnest, not the thickest layer of Earth, and the three layers do have different properties.

Question 2.
Assertion: In asexual reproduction, offsprings look slightly different from £he parent.
Reason: Asexual reproduction involves only one parent and produces genetically identical copies.
Answer:
d) A is false, but R is. true. Asexual reproduction creates identical offspring, no variation is there and it involves only one parent.

Question 3.
Assertion: Pollination is the process of seeds growing into new plants inside the ovary.
Reason: Pollination involves the transfer of pollen grains to the female part of the flower.
Answer:
(d) A is false, but R is true. Pollination does not involve seed formation inside the ovary. The transfer of pollen grains.

Question 4.
Assertion: Global warming occurs when extra carbon dioxide is quickly absorbed by trees and ocean planktons.
Reason: Burning fossil fuels releases carbon that was locked underground for millions of years, adding more C02 than the Earth can absorb.
Answer:
(d) A is false, but R is true. Global warming occurs when extra C02 is not absorbed fast enough, it occurs due to the burning of fossil fuels.

Question 5.
Assertion: In most mammals, the baby develops inside the mother’s body.
Reason: birds lay eggs with food stored for the developing embryo, which hatch outside,
Answer:
(b) Both A and R are true, but R is not the correct explanation of A. Mammals develops baby inside their body, while egg-laying and hatching are features of birds.

Question 6.
Assertion: Switching to renewable energy sources can help reduce global warming.
Reason: Renewable sources like solar and wind increase oxygen content in the air.
Answer:
(c) A is true and R is false. Renewable energy reduces global warming, but it does not increase oxygen content in the air.

Question 7.
Assertion: Soil pollution improves the fertility of soil and increases crop yield.
Reason: Improper waste disposal and excessive fertilisers degrade the soil and spread harmful substances.
Answer:
(d) A is false, but R is true. Soil pollution harms fertility and crop yield, though improper waste disposal and fertilisers do cause such pollution.

Fill in the Blanks

Question 1.
Fill in the blanks by choosing the appropriate words from the box given below:

atmosphere, crust, hydrosphere, venus, reproduction, magnetic field, greenhouse effect, genes, geodiversity, air pollution

(a) The thin outermost layer of the Earth where we live is called the _____.
Answer:
crust

(b) The layer of gases surrounding the Earth is known as the _____.
Answer:
atmosphere

(c) The natural process that keeps the Earth warm by trapping heat is the _____.
Answer:
greenhouse effect

(d) The part of Earth that includes all water bodies is called the _____.
Answer:
hydrosphere

(e) Earth’s _____ protects us from harmful solar wind and cosmic rays.
Answer:
magnetic field

(f) The transfer of genetic instructions from parents to offspring happens through _____.
Answer:
genes

(g) The continuation of life is ensured by the process of _____.
Answer:
reproduction

(h) Burning of fossil fuels and factory emissions lead to _____ affecting human health and the environment.
Answer:
air pollution

Question 2.
Fill in the blanks by unjumbling the words given in the bracket:
(a) The thick layer of gases on Venus causes an extreme _____ (heoseegnur fetcef).
Answer:
greenhouse effect

(b) Earth’s strong magnetic field is created by movement of molten _____ (onir).
Answer:
iron

(c) The ozone layer blocks harmful _____ (vloiuteratl) rays from the Sun.
Answer:
ultraviolet

(d) Earth’s position in the _____ (rsoal tesyms) helps maintain life-friendly temperatures.
Answer:
solar system

(e) Plants use sunlight to make their food through _____ (tsohysepsotinh).
Answer:
photosynthesis

True/False

Question 1.
Put a tick (✓) with a green sketch pen for correct statements and a cross (✗) with a red sketch pen for incorrect ones.
(a) The Earth’s crust is the thickest and heaviest layer of the planet.
Answer:
✗

The crust is the outermost and thinnest layer of the Earth.

(b) The habitable zone is also called the Goldilocks zone.
Answer:
✓

(c) The hydrosphere includes rivers, lakes, and oceans.
Answer:
✓

(d) Genes are the instructions stored inside every cell.
Answer:
✓

(e) Pollination is the transfer of pollen from ovary to fruit.
Answer:
✗
Pollination is the transfer of pollen from the anther of a flower to the female gametes of another flower.

(f) Climate change has no effect on sea levels or weather.
Answer:
✗
Climate change contributes to rising sea levels and alters weather patterns worldwide.

Question 2.
Choose the option which shows the correct sequence of True (T) and False (F) for the statements given below.
(i) Venus has extreme temperatures due to its thick C02 layer.
(ii) Mars lies within the Sun’s habitable zone.
(iii) Plants absorb oxygen and release carbon dioxide during photosynthesis.
(iv) Soil gets nutrients from both weathered rocks and dead organisms.
(v) The biosphere consists only of land animals.
(vi) Reproduction in living beings helps continue life on Earth.
(a) T, T, F, T, F, T
(b) T, T, T, F, T, F
(c) F, F, F, T, F, T
(d) T, F, T, T, T, T
Answer:
(a) T, T, F, T, F, T

Match the Following

Question 1.
Match the terms in Column I with the related explanations in the Column II.

Column I	Column II
(a) Photosynthesis	(i) One parent produces identical offspring
(b) Asexual reproduction	(ii) Male and female reproductive cells
(c) Sexual reproduction	(iii) Plants make food using sunlight and carbon dioxide
(d) Vegetative propagation	(iv) Two parents involved in reproduction
(e) Gametes	(v) Transfer of pollen
(f) Pollination	(vi) New plant from root, stem, or leaf part

Answer:

Column I	Column II
(a) Photosynthesis	(iii) Plants make food using sunlight and carbon dioxide
(b) Asexual reproduction	(i) One parent produces identical offspring
(c) Sexual reproduction	(iv) Two parents involved in reproduction
(d) Vegetative propagation	(vi) New plant from root, stem, or leaf part
(e) Gametes	(ii) Male and female reproductive cells
(f) Pollination	(v) Transfer of pollen

Question 2.

Column I	Column II
(a) Satellite images	(i) Processes that shape and alter earth’s surface
(b) Earths crust	(ii) Help observe weather patterns and environmental changes
(c) Geodiversity	(iii) Outermost solid layer where life exists
(d) Earth’s atmosphere	(iv) Constant stream of charged particles from the Sun
(e) Solar wind	(v) Natural process that warms the Earth’s surface
(f) Greenhouse effect	(vi) Contains oxygen, nitrogen, and other gases

Answer:

Column I	Column II
(a) Satellite images	(ii) Help observe weather patterns and environmental changes
(b) Earths crust	(iii) Outermost solid layer where life exists
(c) Geodiversity	(i) Processes that shape and alter earth’s surface
(d) Earth’s atmosphere	(vi) Contains oxygen, nitrogen, and other gases
(e) Solar wind	(iv) Constant stream of charged particles from the Sun
(f) Greenhouse effect	(v) Natural process that warms the Earth’s surface

Label the Diagram

Question 1.
Look at the picture carefully. Write the correct names of the parts pointed by arrows in the diagram.

(a) __________________________
(b) __________________________
Answer:
(a) anther
(b) ovule

(a) __________________________
(b) __________________________
(c) __________________________
Answer:
(a) egg cell
(b) zygote
(c) sperm cell

(a) __________________________
(b) __________________________
(c) __________________________
(d) __________________________
(e) __________________________
Answer:
(a) crust
(b) upper mantle
(c) lower mant
(d) outer core
(e) inner core

Flow chart Completion

Question 1.
Complete the following flowchart on reproduction.

A. _____
B. _____
C. _____
D. _____
E. _____
Answer:
A – sexual
B – asexual
C – gametes
D – zygote
E – exact

B. Subjective Type Questions

Define the Following Terms

1. Crust
__________________________

2. Greenhouse Effect
__________________________

3. Hydrosphere
__________________________

4. Biosphere
__________________________

5. Gametes
__________________________

6. Renewable Energy
__________________________

Give Reasons for the Following

1. Even a small increase in Earth’s temperature can cause ice caps to melt and coastal cities to flood.
__________________________

2. The ozone layer is essential for life on Earth.
__________________________

3. Pollination in plants is essential for seed formation and plant reproduction.
__________________________

4. A child inherits features like eye colour or nose shape from both parents but still looks unique.
__________________________

5. Mammals do not lay eggs like birds, but instead nourish their baby inside the body.
__________________________

Very Short Answer Type Questions

Question 1.
If Earth’s crust were as thick as the mantle, what challenge might life face on the planet?
__________________________
__________________________

Question 2.
How does Earth’s greenhouse effect differ from a plant greenhouse?
__________________________
__________________________

Question 3.
Why is Earth’s gravity important for the atmosphere?
__________________________
__________________________

Question 4.
If a region loses all its plant life, how might this impact the local animal population?
__________________________
__________________________

Question 5.
How cutting down forests disturb the balance among Earth’s natural systems?
__________________________
__________________________

Question 6.
If bacteria reproduce without any mixing of genes, what type of reproduction is this, and what is its main feature?
__________________________
__________________________

Question 7.
When a child resembles both parents but still looks different, what biological process explains this?
__________________________
__________________________

Question 8.
The diagram shows a planaria cut into many pieces. After a few days, all the pieces grow into complete individuals.

What is this method of reproduction called?
__________________________
__________________________

Question 9.
How do birds help plants spread?
__________________________
__________________________

Question 10.
Why might laying eggs outside the body not be ideal for mammals like humans?
__________________________
__________________________

Question 11.
If renewable energy sources are widely used, what change is expected in global temperature trends?
__________________________
__________________________

Question 12.
Name two international agreements that have helped address environmental issues.
__________________________
__________________________

Question 13.
What is needed to protect water and soil?
__________________________
__________________________

Short Answer Type Questions

Question 1.
If Earth had no magnetic field. Write one change you might observe in your daily life, and explain why it happens.
__________________________
__________________________

Question 2.
If you had to build a planet for life, name two conditions you would copy from Earth.
__________________________
__________________________

Question 3.
On Venus, thick C02 traps heat. Suppose Earth had a similar atmosphere. How might this change your surroundings?
__________________________
__________________________

Question 4.
The image shows heat from the Sun entering Earth’s atmosphere, with some of it getting trapped and some escaping. What could be the consequence if more heat gets trapped than normal?

__________________________
__________________________

Question 5.
You are a drop of water in the hydrosphere. Describe your journey through tfue air and soil.
__________________________
__________________________

Question 6.
A large forest is cut down in a region. List any two effects this action might have on the water cycle.
__________________________
__________________________

Question 7.
Explain with an example how the loss of one species (e.g. grasses) can disrupt an entire ecosystem, and biodiversity as a whole.
__________________________
__________________________

Question 8.
Why do siblings look different even with the same parents? Use the idea of genetic mixing to answer.
__________________________
__________________________

Question 9.
Which form of reproduction sexual or asexual is better for survival in changing environments? Justify your answer briefly.
__________________________
__________________________

Question 10.
Suppose Earth moved slightly farther from the Sun. Predict one effect this could have on climate and life.
__________________________
__________________________

Question 11.
What are the three main components of the “triple planetary crisis,” and how do they interink to threaten life on Earth?
__________________________
__________________________

Long Answer Type Questions

Question 1.
One evening, Aarav was watching the sunset with his father, he was curious about how nature works, he asked,
“Papa, why do we say Earth is perfect for life? What makes it so special compared to other planets?”
His father smiled and replied,
“Well, Aarav, it’s because Earth has just the right mix of air, sunlight, and water. The air gives us oxygen to breathe and carbon dioxide for plants. Sunlight gives energy and warmth for life, and water is essential for every living thing—from plants to animals to us.”
Using this conversation, explain how the atmosphere, sunlight, and water work together to support life on Earth.
___________________________________________
___________________________________________

Question 2.
As shown in the image that captures Earth’s geodiversity — including mountains, rivers, soil layers, rocks, and forests — all part of the natural variety found on the planet’s surface.

Answer the following guestions.
(a) What is geodiversity, and why is it important for life on Earth?
___________________________________________
___________________________________________

(b) How do non-living features like rocks, soil, and water actively support living organisms?
___________________________________________
___________________________________________

(c) Why should geodiversity be protected, and how might damaging it affect the balance of ecosystems?
___________________________________________
___________________________________________

Question 3.
Explain the process of sexual reproduction in flowering plants. Describe role of male and female parts, the steps involved from pollination to fertilisation, and how seeds are formed.
___________________________________________
___________________________________________

Case Based Questions

Question 1.
Teacher : “Can anyone tell me how water helps living things?”
Riya : “It helps plants move nutrients.”
Teacher : “Correct! In animals, it helps in digestion and controlling body temperature. Also, rainfall affects which plants and animals live in an area. Remember, water covers about 70% of Earth’s surface.”

Answer the following questions based on the case above:
(i) What percentage of Earth’s surface is covered with water?
(a) 50%
(b) 60%
(c) 70%
(d) 80%
Answer:
(c) 70%

(ii) According to the teacher, what role does water play in animals?
(a) Helps in reproduction and movement
(b) Helps in digestion and body temperature control
(c) Only helps in hydration
(d) Only provides energy to cells
Answer:
(b) Helps in digestion and body temperature control.

Question 2.
Some plants reproduce from their leaf, stem, or root. This is called X. Simple animals like Y can grow into a complete organism from a body fragment. Hydra forms buds, and amoeba splits into two. All these are examples of asexual reproduction, where only one parent is involved.
I. What is ‘X’ in the passage?
(a) Budding
(b) Pollination
(c) Vegetative propagation
(d) Sexual reproduction
Answer:
(c) Vegetative propagation

II. What is T in the passage?
(a) Planaria
(b) Bacteria
(c) Hydra
(d) Algae
Answer:
(a) Planaria

Question 3.
Student Ma’am, I saw a thick layer of smoke over the city yesterday. My dad said it’s called smog. What causes it?
Teacher That’s right. Smog is a mix of smoke and fog, often caused by air pollution from factories, vehicles, and burning fossil fuels like coal and petrol.
Student Is it dangerous?
Teacher Yes, very. It can lead to breathing problems in humans, damage crops, and even harm animals. Over time, it also contributes to acid rain and climate change.
Student So how can we stop it?
Teacher We need to reduce pollution by using cleaner sources of energy like solar and wind power, and make more eco-friendly choices in daily life.
(a) Why is smog considered a sign of deeper environmental imbalance rather than just dirty air?
___________________________________________
___________________________________________

(b) How does the continued use of fossil fuels threaten both present and future generations?
___________________________________________
___________________________________________

(c) Why is shifting to renewable energy not just a solution but a responsibility for reducing air pollution?
___________________________________________
___________________________________________

Skill Based Activities

Question 1.
Unscramble the jumbled words to get the correct word using the clues given below:
(a) The sphere that includes air and gases around Earth.
HRETOPMESA __________________________
Answer:
HRETOPAMESA → ATMOSPHERE

(b) The process by which plants make food using sunlight.
SYOTNSSOPHEITH __________________________
Answer:
SYOTNSSOPHEIA → PHOTOSYNTHESIS

(c) The gas used by plants during photosynthesis.
ODCRNABDOIXIE __________________________
Answer:
ODCRNABDOIXIE → CARBONDIOXIDE

(d) The outer rocky layer of the Earth that includes soil and minerals. ,..
OSEEGHPRE __________________________
Answer:
OSEEGHPR → GEOSPHERE

(e) Example of Asexual reproduction where a single parent splits into two equal halves.
ABOMEA __________________________
Answer:
ABOMEA → AMOEBA

(f) The process by which a flatworm can regrow from a body fragment.
RTGAIREONEEN __________________________
Answer:
RTGAIREONEEN → REGENERATION

(g) A harmful change in air, water, or soil.
POLUTNOIL __________________________
Answer:
POLUTNOIL → POLLUTION

Question 2.
I stand still but make my own food,
With sunlight, water, and air as my mood.
I take in gas you breathe out each day,
And give you fresh air in a leafy way.
What am I? __________________________
Answer:
A plant (doing photosynthesis)

Question 3.
Complete the Paragraph.
In birds, the fertilised egg or (i) _____ is laid by the (ii) _____ . The development of the (iii) _____ takes place after the egg is laid. To support the growing embryo, the female stores enough (iv) _____ in the egg. This strategy ensures that the embryo gets proper (v) _____ until it hatches.
(i) _____
(ii) _____
(iii) _____
(iv) _____
(v) _____
Answer:
(i) zygote
(ii) female
(iii) embryo
(iv) food
(v) nutrition

Question 4.
Find the words from the puzzle with the help of the clues given below.
1. Mixture of gases we breathe. __________________________
2. Top layer where plants grow. __________________________
3. Polluted fog mixture harmful to breathe __________________________
4. Essential for plant growth, comes from lakes and rivers. __________________________
5. Young plant in its first stage. __________________________
6. Embryo enclosed in a shell in birds. __________________________

Answer:
1. AIR
2. SOIL
3. SMOG
4. WATER
5. SEED
6. EGG

The post Our Home: Earth, A Unique Life Sustaining Planet Class 8 Worksheet with Answers Science Chapter 13 appeared first on Learn CBSE.

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