Important Questions Class 8 Science Chapter 7

Important Questions Class 8 Science Chapter 7 – Conservation of Plants and Animals

Chapter 7 of Class 8 Science is about ‘Conservation of Plants and Animals’. The varieties of animals and plants on earth are essential for the well-being and survival of humankind and overall life species. In this chapter, students would learn about biodiversity or biological diversity that covers a variety of organisms on the earth, their interrelationships, and their relationship with the environment. The government set up rules, methods, and policies to protect and conserve biodiversity and created protected areas such as wildlife sanctuaries, national parks, biosphere reserves, etc. 

Extramarks is one of the leading online educational platforms for students from Class 1 to Class 12. Our academic experts understand the importance of frequently solving questions to gain a better understanding of the Science concepts. We have collated questions from different sources including NCERT textbook, NCERT exemplars, past year question papers, other reference books, etc. 

Science requires a lot of effort to memorise and remember scientific names and biological and environmental concepts. Students often find it difficult to memorise it all at once. Hence studying and revising Science requires consistent and timely efforts. Students should regularly practice solving NCERT exercises and exemplar questions to understand the chapter concepts better.

The experienced Science faculty at Extramarks have compiled Important Questions Class 8 Science Chapter 7 using NCERT textbook, reference books, NCERT exemplar, past years’ question papers, and several other sources. To assist students in comprehending the full chapter, our Science faculty has prepared step-by-step solutions to all these questions mentioned in the Class 8 Science Chapter 7 Important Questions. Students must understand the topics clearly and practice as many questions as possible before their exams. Science Class 8 Chapter 7 Important Questions help students to acquire good academic scores and prepare for their examinations. Students are advised to register on Extramarks and get access these questions and answers and other study materials. 

Get Access to CBSE Class 8 Science Important Questions 2022-23 with Chapter-Wise Solutions

You can also find CBSE Class 8 Science Chapter-by-Chapter Important Questions here:

CBSE Class 8 Science Important Questions
Sr No. Chapters Chapters Name
1 Chapter 1 Crop Production and Management
2 Chapter 2 Microorganisms : Friend and Foe
3 Chapter 3 Synthetic Fibres and Plastics
4 Chapter 4 Materials : Metals and NonMetals
5 Chapter 5 Coal and Petroleum
6 Chapter 6 Combustion and Flame
7 Chapter 7 Conservation of Plants and Animals
8 Chapter 8 Cell Structure and Functions
9 Chapter 9 Reproduction in Animals
10 Chapter 10 Reaching The Age of Adolescence
11 Chapter 11 Force and Pressure
12 Chapter 12 Friction
13 Chapter 13 Sound
14 Chapter 14 Chemical Effects of Electric Current
15 Chapter 15 Some Natural Phenomena
16 Chapter 16 Light
17 Chapter 17 Stars and The Solar System
18 Chapter 18 Pollution of Air and Water

Important Questions Class 8 Science Chapter 7 – With Solutions

Our question bank of Chapter 7 Class 8 Science Important Questions covers all topics from the chapter. By solving questions students will get to revise about social issues and various ways of saving the environment. Other important topics covered are deforestation, wildlife conservation, and forest.

 Extramarks provides students with a joyful learning experience and constantly strives to upgrade its products year after year to meet the changing demands of the curriculum.A comprehensive list of important questions has been curated  by following NCERT books while adhering to the latest CBSE syllabus and guidelines. . This will help the students to understand the exam question pattern. Hence students can prepare accordingly. Important Questions Class 8 Science Chapter 7 provides different question-answer solutions, including MCQs, short answer questions, long answer questions, etc. 

The experts understand the key topics which students might find challenging while studying, therefore the study materials are prepared in such a way that they can get to the point answers without wasting much time on a single subject.

 A few of the questions and answers from our question bank of Important Questions Class 8 Science Chapter 7 are given below.

Question 1. Which one of the following statements is true about endemic species?

  1. They are found exclusively in specific habitats.
  2. Endemic species can never become endangered.
  3. They are found only in botanical gardens and zoos.
  4. They are not affected by the destruction of their habitat.

Answer 1.

The correct option is A- They are found exclusively in a specific habitat.

Explanation of correct option:

  1. Endemic species are those species which are specific to a confined geographical area.
  2. These species are important to maintain a balance in the ecosystem.
  3. Species can be plants, animals, fungi, or even microorganisms.

Explanation of incorrect options:

Option B: Endemic species can be endangered as they are found in particular areas.

Option C: They are not found in zoos and botanical gardens.

Option D: They are affected by the destruction of their habitat.

Question 2. Why are wildlife sanctuaries important for the conservation of plants and animals?

Answer 2.

A wildlife sanctuary is an area where animal habitats and surroundings are protected from disturbance. The capturing, killing and poaching of animals are strictly prohibited in these regions.

  • The wildlife sanctuaries are established to protect endangered species.
  • It is quite difficult always to relocate animals from their natural habitat; therefore, protecting these animals in their natural environment is more advantageous.
  • The endangered species are monitored in the wildlife sanctuaries. If these species reproduce and grow in number while under protection, a few specimens can be kept for the breeding process in the conservation parks for their survival.
  • A few sanctuaries take injured and different abandoned animals and rehabilitate them to health before releasing them in the forest.


Question 3. How does deforestation lead to frequent floods and droughts?

Answer 3.

Deforestation results in the decreased water-holding capacity of the soil. This drops the infiltration of water into the ground, which causes floods. On the other hand, deforestation leads to a higher level of carbon dioxide in the atmosphere, which causes global warming. The scarcity of trees disturbs the water cycle and may reduce rainfall, leading to droughts.

  • As the number of braids reduces, the soil structure changes and the soil particles held firmly get disturbed.
  • As a result, when heavy rainfall occurs, the rainwater does not seep into the ground and is not absorbed by the trees. Hence, it leads to flooding.

Question 4. How do some tribals depend on the jungle?

Answer 4:

Some tribals depend on the jungle for food, clothes, shelter, wood, medicines and other requirements. For daily needs, it is inevitable for them to depend on forests and their resources.

How is forest related to tribes?

Some tribals live in jungles as the forest provides any resource they require to sustain life. They receive  clean water from the forest, gather vegetables and fruits, and hunt for jungle-living animals. All these houses they live in are made up of items collected from the forest. Their garments are either made of large leaves or wild animal skin.

  • Forests support the livelihood of many people, especially the tribal, who depend almost entirely on this forest for survival.
  • Tribals were the original human settlers of forests. They depended on the forest as a resource for fulfilling their basic needs and to use it as a balance, productive ecosystem.
  • The ornaments worn by the women and men are made from seeds, animal bones, horns, shells, and nails (these are made in the form of earrings, necklaces, bangles, etc.

Question 5. What do blackbuck, python, elephant and golden cat represent in a forest?

  1. fauna
  2. flora
  3. ecosystem
  4. species

Answer 5:

The correct option is A- fauna.

The correct option is A.

Explanation of correct option:

  1. Fauna regards the animals that live in a specific location.
  2. So, blackbuck, elephant, python, and golden cat represent the forest’s fauna.

Explanation of incorrect options:

Option B:

  1. Flora refers to all plant life in a given location or period, typically made up of naturally occurring in a particular area..
  2. Bacteria and fungus are sometimes referred to as flora, in words, gut flora and skin flora.

Option C: An ecosystem is a geographical area where plants, animals, and other species, as well as weather and geography, work together to create a living bubble.

Option D: A species is a group of living organisms s made of identical organisms capable of interbreeding or DNA transmission.

Question 6. Does soil erosion affect the fertility of soil? How?

Answer 6.

Soil erosion:

  1. A gradual process occurs when the impact of wind or water removes and detaches the soil particles, resulting in soil deterioration, which is known as soil erosion.

Affects :

  1. Soil erosion has effects on the fertility of the soil by removing the fertile top layer of the soil, thus, exposing the hard rocky lower layers that are less fertile.
  2. The soil’s tendency to sustain the plant’s growth and increase crop yield is known as soil fertility.
  3. The soil must be deep enough for roots to develop and retain water.
  4. Water, which evaporates very quickly or weakens the growth of roots, will result in the formation of plants that do not survive.
  5. The fertility of the soil is essential for the soil to provide the perfect medium for any plants to develop.

Question 7. Mention the aim of the Forest (Conservation) Act.

 Answer 7.

The Forest Conservation Act was enforced in the year 1980. Its main objective is to preserve and conserve natural forests that meet the basic needs of people living nearby or in the forests.

  1. The act restricts state government and other authorities from taking decisions primarily without permission from the central government.
  2. The Forest Conservation Act grants complete authority to the Central government to carry out the act’s objectives.
  3. The Forest Conservation Act will need an advisory committee to help the Central government concerning forest conservation.
  4. This act aims to foster recognition of the forest as a common heritage and promote sustainable forest development to meet the current and future economic, environmental and social needs.

Question 8. Is deforestation associated by global warming? Explain.

 Answer 8.

Forests serve as carbon sinks by absorbing atmospheric carbon dioxide during the photosynthesis process. Since carbon dioxide is a greenhouse gas, deforestation directly contributes to the greenhouse effect and (consequently) global warming.

  • Deforestation allows the generation of raw materials for a vivid range of industries. Examples include the wood industry, the agriculture industry and the construction industry.
  • One of the main leading causes of deforestation is agriculture and cattle grazing. Forest land is usually cleared and transformed into agricultural land to keep up with the ever-increasing requirement for food (which can, in turn, be linked to overpopulation).
  • Deforestation results in a decreased number of trees leading to the accumulation of carbon dioxide present in the atmosphere. Carbon dioxide in the atmosphere traps heat rays reflected by the earth, resulting in global warming.

Question 9. Why should we save paper? Prepare a list of different ways of saving paper.

Answer 9.


  1. Paper is a basic article of our day-to-day life.
  2. It is manufactured from trees.
  3. It causes unchecked deforestation by reducing forest cover.
  4. It leads to the loss of natural flora and fauna.
  5. It eventually will lead to decreased oxygen in the environment, affecting all organisms and the environment.
  6. Hence, we should save paper.

Ways to save paper:

  1. We should avoid littering paper.
  2. Recycling paper should be encouraged by providing proper channels.
  3. The purchasing and use of recycled paper should be promoted.
  4. Old and used books should be circulated again among other readers.

Question 10. In our country, large patches of forests are being cleared to cultivate crops. The environmental impact of such a practice will lead to:

  1. soil erosion
  2. soil conservation
  3. soil pollution
  4. soil fertility

Answer 10.

The correct option is A- soil erosion.

Explanation of the correct option:

  1. Soil erosion is a process of removal of the topmost fertile layer of the soil.
  2. This is done by sources such as wind and water and is worsened by deforestation and extensive agricultural practices.
  3. Clearing many trees from forests causes soil erosion as forests anchor the soil using their roots.

Explanation of the incorrect options:

Option B: Soil conservation includes a set of practices used to prevent soil erosion and degradation.

Option C: Soil pollution is the presence of highly toxic chemicals in the soil which can cause a risk of humans as well as the environment.

Option D: Soil fertility is the capability of the soil to provide the plant with the required nutrients and sustain it.

Question 11. How important are small animals in an ecosystem?

Answer 11.

Small organisms in an ecosystem:

  1. The ecosystem is a community where we can find a balance between different organisms and nature.
  2. In an ecosystem, every organism is important to maintain a balance.
  3. Even small organisms have an important role in an ecosystem.
  4. Small organisms play an important part in the food chain and food web. For example, we have decomposers, mostly microorganisms, which help decompose dead and decaying matter.
  5. Extinction of one organism can lead to another related to the former for its survival.
  6. Even the removal of one small organism can have a deteriorating effect on the ecosystem.

Question 11. What is the unique feature of the biodiversity found in the Pachmarhi Biosphere Reserve?

Answer 11. 

The biodiversity in Pachmarhi Biosphere Reserve is indistinguishable from the ones of the upper Himalayan peaks and all those belonging to the lower Western Ghats. Fauna, as well as the flora in that area, is unlike anywhere else in the country, which makes the reserve so unique.

  • It is a very large protected area constructed for the conservation of biodiversity.
  • It helps conserve various life forms, such as plants, animals, and microorganisms.
  • Biosphere Reserves try to balance social and economic development and maintenance of the associated cultural values along with the preservation of nature.
  • Along with the wildlife, the culture and customs of tribals are also protected

Question 12. Protected forests are also not completely safe for wild animals. Why?

Answer 12.

Protected forests are not entirely safe for wild animals because the people who live adjacent or near to forests use resources from forests to fulfil their requirements. In this process, wild animals get killed and sold for lucrative profits.

Question 13. A new species, X, is introduced in a forest. How is it likely to affect the local species of that area?

Answer 13.

Introducing a new species may affect local species due to competition. The members of these species may compete for food and other resources with the organisms present in the ecosystem, which can result in a rapid decrease or extinction of a species which is crucial for the ecosystem to maintain stability.

The new species can affect the local species in the following ways

  • There can be competition between them for food and shelter.
  • They may prey on the local species.
  • It may prevent local species from reproducing.
  • Maybe a change in the food chain or food web.

Question 14. What is a Red Data Book?

Answer 14. 

The Red Data Book is a public document created for recording endangered and rare species of plants, animals, and fungi and some local subspecies present in a particular region.

The Red Data Book helps us provide complete information for research, studies, and monitoring programs on different rare and endangered species and their habitats. This book is majorly created to identify and protect those species on the verge of extinction.

Question 15. What are the causes and consequences of deforestation?

Answer 15. 


Deforestation is converting forested areas to non-forested ones by cutting off trees.


  1. Forests are converted to agricultural land to feed the world’s rising population.
  2. Trees are felled for various reasons, including timber, firewood, and cow ranching.
  3. Slash-and-burn agriculture, known in India’s north-eastern states as Jhum cultivation, has also contributed to deforestation.
  4. Construction of houses and other structures.
  5. Forest fires are sparked by lightning and other natural phenomena.


  1. Deforestation causes increased carbon dioxide concentrations in the atmosphere.
  2. Deforestation also causes biodiversity loss owing to habitat destruction.
  3. Disrupts the hydrologic cycle.
  4. Causes soil erosion.
  5. In severe circumstances, it can lead to desertification.

Question 16. What do you understand by the term migration?

Answer 16. 


  1. The movement of an organism or a group of organisms from one area to another at a specific time each year is called migration.
  2. Organisms travel from one location to another to avoid harsh environmental circumstances or to reproduce.

Importance of migration:

  1. Migration is important as animals generally migrate in groups to protect and find better food places.
  2. To find good habitat, organisms migrate.
  3. Due to unfavourable environmental conditions, like high temperatures or high cold, animals tend to migrate.
  4. A group of species that migrate contribute to the top-down effect.
  5. A top-down effect means an influence from a higher trophic level causes low trophic level organisms to follow them.

Benefits of Solving Important Questions Class 8 Science Chapter 5

Important Questions Class 8 Science Chapter 7 give students an insight into the crucial topics discussed in the chapter. After practising MCQs, short, medium, and long answer questions provided with explanatory solutions, students can get well versed with question patterns. 

The various benefits of referring to Important Questions Class 8 Science Chapter 7 are:

  • The step-wise solutions prepared by the expert faculty at Extramarks assist students in revising and understanding the important concepts mentioned in the chapter and getting good grades. This will help students boost their confidence in the final school examination.
  • Students can entirely rely on the Extramarks solutions as they are based and have been compiled by following NCERT books while adhering to  the latest  CBSE syllabus and guidelines. 
  • The important questions are prepared following the exam question pattern. Therefore going through these questions, students will get an idea about the exams and the nature of the questions.
  •  Subject experts have created several pointwise notes that help students conveniently recall the crucial points in the exam and use these solutions for last-minute revisions.The complete guide to important questions combines a variety of questions like MCQs, short answer questions, long answer questions, etc., to help students score well in their examinations.
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Q.1 Define force of friction. How is the force of friction disadvantageous ?


When two surfaces slide over each other, the force, which opposes the motion of one body over the other, is called force of friction. Disadvantage of frictional forces are seen as:
(i)Wear and tear of objects coming in contact. Example: soles of shoes and tyres of vehicles.
(ii)Loss of energy as heat. Example: Machine parts get heated up and lead to wear and tear.
(iii)Loss of energy to overcome friction. Example: Wastage of fuel in machinery.

Q.2 State and explain different types of friction.


There are three types of friction:

(i)Static friction: The friction that exists between the surfaces in contact when there is no relative motion is called static friction.

(ii) Dynamic or sliding friction: The friction that exists between the surfaces in contact when a body slides on the surface of another body is known as the sliding friction.

(iii)Rolling friction: The friction that exists between the surfaces in contact when a body rolls over the surface of another body is known as the rolling friction.

For any two surfaces in contact during motion:

Rolling friction < Sliding friction < Static friction.

Q.3 Mention three disadvantages of friction between the parts of a machine. How does (a) oiling and (b) using ball bearings help reduce friction?


Three disadvantages of friction between the parts of a machine are
1. Lot of heat is produced
2. Lot of energy is wasted
3. There is wear and tear of different parts
Friction can be reduced by
(a)By oiling: Oil act as a lubricant. It fills up the dents (irregularities) of the surfaces that move against each other in a machine. It also prevents direct contact between the surfaces by forming a film between the surfaces.

(b)By using ball bearings: Use of ball bearings converts sliding friction into rolling friction. Rolling friction is less than sliding friction. The ball bearing s used between the hubs and the axles of bicycle, and fans.

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FAQs (Frequently Asked Questions)

1. What can I find on the Extramarks website?

Extramarks is among India’s leading trusted educational platforms across India. . It has its repository of a variety of resources which students find hard to say no to. Students will come across various NCERT-related study materials like NCERT textbooks, reference books, NCERT exemplars, past examination papers, NCERT revision notes, NCERT-based mock tests, Ncert formulas, and others. Important Questions Class 8 Science Chapter 7 is available on the Extramarks website. Apart from these materials, you will also gain comprehensive guidance from our subject experts and doubt-clearing sessions after signing up on the website. Be an early bird and make the most of this opportunity.

2. Which are the main chapters from the Class 8 Science textbook?

CBSE Class 8 Science has a total of eighteen chapters. All chapters are important from a learning and exam perspective so students are advised to study and revise all the chapters.

Below is a list of these 16 chapters from Class 8 Science
Chapter 1 Crop Production and Management
Chapter 2 Microorganisms: Friend and Foe
Chapter 3 Synthetic Fibres and Plastics
Chapter 4 Materials: Metals and Non-Metals
Chapter 5 Coal and Petroleum
Chapter 6 Combustion and Flame
Chapter 7 Conservation of Plants and Animals
Chapter 8 Cell – Structure and Functions
Chapter 9 Reproduction in Animals
Chapter 10 Reaching the Age of Adolescence
Chapter 11 Force and Pressure
Chapter 12 Friction
Chapter 13 Sound
Chapter 14 Chemical Effects of Electric Current
Chapter 15 Some Natural Phenomena
Chapter 16 Light
Chapter 17 Stars and The Solar System
Chapter 18 Pollution of Air and Water

3. Why should we conserve biodiversity?

The number and wide range of life forms such as plants, animals and microorganisms in the area are called biodiversity. Both plants and animals mutually depend on each other for their survival. As they are related, the destruction of one will automatically destroy the other. Hence, biodiversity has to be conserved to maintain nature’s balance.