Class 8 Science Chapter 12 Reproduction in Animals Solutions | ASSEB Assam | English Medium

Class 8 Science Chapter 12 – Reproduction in Animals – All Textual Solutions | ASSEB Assam (English Medium)

Class 8 Science Chapter 12 – Reproduction in Animals Complete Textual Questions and Answers (ASSEB / SEBA Assam – English Medium)

Chapter 12 of the Class 8 Science curriculum, ‘Reproduction in Animals’, is a fundamental biology chapter that explains how life continues from one generation to the next. These complete textual question-answer solutions (Class 8 Science Chapter 12 Textual Solutions) have been meticulously prepared based on the latest guidelines of the new ASSEB (Assam State School Education Board) syllabus and the National Education Policy (NEP). This comprehensive compilation includes textbook-based Very Short Answers (VSA), Short Questions, Long Answers, and detailed biological explanations. Ospin Academy provides these solutions in a simple, accurate, and completely exam-oriented format.

The chapter ‘Reproduction in Animals’ provides an in-depth understanding of the two modes of reproduction: Sexual and Asexual. Students will learn about the male and female reproductive organs, the process of fertilization (internal and external), and the development of the embryo. The chapter also covers fascinating topics like Viviparous and Oviparous animals, the life cycle of frogs (metamorphosis), and asexual methods like budding in Hydra and binary fission in Amoeba. It is essential for students to thoroughly grasp these core concepts. Our textual solutions not only cover all the standard textbook exercises but also include important additional exam-oriented questions to ensure robust preparation.

What you will learn and get from these textual solutions:

• Clear explanations of the importance of reproduction and the differences between sexual and asexual modes.
• Accurate, point-wise answers for 1-mark objective questions (VSA) and 2-3 mark short textual questions.
• Standard and easy-to-understand explanations for descriptive questions, such as the process of fertilization and the difference between a zygote and a foetus.
• Detailed descriptions of asexual reproduction methods like Binary Fission and Budding with easy-to-understand steps.
• Complete coverage of end-of-chapter exercises, fill-in-the-blanks, true/false questions, and biological terminology.
• Extra important questions aligned with the new syllabus structure alongside standard MCQ solutions.

Exclusive features of Ospin Academy’s solutions:

• Fully textbook-based answers formulated strictly according to the latest ASSEB new syllabus guidelines.
• 100% accurate, high-quality notes written in simple English language for effortless memorization and conceptual clarity.
• Concise summaries and targeted answers specifically designed for quick revision before examinations.
• A curated selection of highly probable extra questions to give students a competitive edge.

Committed to the academic excellence of students, Ospin Academy offers these high-quality textual solutions. Start your preparation today to master the concepts of Biology and achieve top scores in your upcoming examinations.

Class 8 Science

Chapter – 11                               Ospin Academy

Conservation of Plants and Animals

TEXTBOOK EXERCISES

Q. 1. Fill in the blanks:

(a) A place where animals are protected in their natural habitat is called _________.

Ans. wildlife sanctuary.

(b) Species found only in a particular area is known as __________.

Ans. endemic species.

(c) Migratory birds fly to far away places because of _________ changes.

Ans. climate.

Q. 2. Differentiate between the following:

(i) Wildlife sanctuary and biosphere reserve.

Ans.

Wildlife sanctuary	Biosphere
1. A wild-life sanctuary occupies a comparatively smaller area of land.	1. A Biosphere Reserve is spread over a very large area of land.
2. A wildlife sanctuary is mainly for the protection of wild animals of the area in their natural habitat.	2. A Biosphere Reserve is for the conservation of biodiversity of the area as well as the economic development of the area.

(ii) Zoo and wildlife sanctuary.

Ans.

Zoo	Wildlife Sanctuary
1. In a zoo, the wild wild animals and birds live in artificial settings such as cages and enclosures.	1. In a wildlife sanctuary, animals and birds live in their natural habitat in the forest.
2. A wildlife sanctuary contains wild animals and birds found locally.	2. A zoo contains wild animals and birds brought from the different parts of the country and from various other countries of the world.

(iii) Endangered and extinct species.

Ans.

Endangered species	Extinct Species
1. The species which are facing the risk of extinction are called endangered species.	1. The species which no longer exist any where on the earth are called extinct species.
2. Examples: Snow leopard, Asiatic lion, Desert cat.	2. Examples: Dinosaur, Cave lion, Caspian tiger.

(iv) Flora and Fauna.

Ans.

Flora	Fauna
1. The plants of a particular area called Flora of that area	1. The animals of a particular area are called Fauna of that area.
2. The Flora of pach-marhi biosphere reserve are: Sal, Teak, Mango, Jamun etc.	2. The Fauna of panch-marhi biosphere are chinkara, blue bull, barking deer, cheetal, wild dog etc.

Q. 3. Discuss the effects of deforestation on the following:

(a) Wild animals.

Ans. Wild animals: Plants and trees are the habitat and food for wild animals. So deforestation destroy the natural habitat of wild animals and thus they would become endangered species.

(b) Environment.

Ans. Environment: Deforestation decreases the level of oxygen in the atmosphere. Rainfall and the fertility of soil also decreases due to deforestation. As a result, there are increased chances of natural calamities like floods and droughts.

(c) Villages (Rural areas).

Ans. Villages (Rural areas): Deforestation will cause soil erosion making the soil infertile and lead to desertification. The removal of the top layer of soil during soil erosion, exposes the lower, hard and rocky layer of soil. This lower layer of soil has less humus and it is less fertile. Villagers will not get fruits, fuel, or wood due to deforestation.

(d) Cities (Urban areas).

Ans. Cities: Deforestation does not affect the life of cities directly. Deforestation affects climatic conditions of the area. Calamities like floods and droughts do not spare cities.

(e) Earth.

Ans. Earth: Deforestation affects the earth worstly. The fertile land of the earth is converted into deserts and its temperature rises. It changes its climate and environment.

(f) The next generation.

Ans. The next generation: Many beautiful fauna and flora are destroyed due to deforestation. So, the next generation will not be able to see them.They will not have a clean and healthy environment.

Q. 4. What will happen if:

(a) We go on cutting trees.

Ans. If we go on cutting trees, then:

(i) Ecological balance is disturbed.

(ii) Earth will loose up top fertile layer and converted into desert.

(iii) Floods and droughts will become more frequent.

(iv) Many animals lose their shelters.

(v) There will be scarcity of things like fruits, paper which we get from forests.

(b) the habitat of an animal is disturbed.

Ans. Animals become unprotected and unconserved when the habitat of animal is disturbed. It becomes endangered.

(c) the top layer of soil is exposed.

Ans. Top layers of soil are fertile if it is exposed it loses its fertility and humus. It causes desertification.

Q. 5. Answer in brief:

(a) Why should we conserve biodiversity?

Ans. We should conserve biodiversity to save plants and animals from extinction.

(b) Protected forests are also not completely safe for wild animals. Why?

Ans. The protected areas are not completely safe for wild animals because the poaching takes place on a large scale in these areas. The poachers kill wild animals in those protected area.

(c) Some tribals depend on the jungle. How?

Ans. Some tribals depend on the jungle for their area. food, clothes, shelter and other requirements.

(d) What are the causes and consequences of deforestation?

Ans. Causes of deforestation: Due to changing lifestyle of the people and development of technology, the utilization of forest products has increased tremendously.

The main causes of deforestation are:

(i) Requirement of more timber for housing purposes due to increase in population.

(ii) Clearing the forest land for cultivation.

(iii) Construction of roads and dams.

(iv) Overgrazing by the cattle.

(v) Increased mining industry.

Consequences of Deforestation:

(i) Deforestation will cause an increase in temperature on earth’s atmosphere leading to global warming.

(ii) Deforestation will cause soil erosion making the soil infertile and lead to desertification.

(iii) Deforestation will cause frequent flooding of rivers leading to loss of life and property.

(iv) Deforestation affects the water cycle leading to decrease in rainfall. The decrease in rainfall lowers the ground water level and could cause droughts.

(v) Deforestation leads to the extinction of many wild animals and plants.

(vi) Deforestation will lead to a shortage of wood and other forest products.

(e) What is a Red Data Book?

Ans. Red Data Book: Red Data Book is the book which keeps a record of all the endangered animals, plants and other species. The first Red Data Book of animals was published in 1991.

Through this book, IUCN (now WCU) is trying to create awareness about the endangered species.

(f) What do you understand by the term migration?

Ans. Migration: The seasonal movement of animals from one habitat to another to overcome unfavorable conditions is called migration. Animals migrate between their wintering and breeding habitats.

Q. 6. In order to meet the ever-increasing demand in factories and for shelter, trees are being continuously cut. Is it justified to cut trees for such projects? Discuss and prepare a brief report.

Ans. The continuously cutting of trees is not justified for any project. We do not only cut the trees, we destroy the habitats of many animals, birds and other organisms. The ecological balance is also disturbed. It also causes many natural calamities such as floods and droughts.

Q. 7. How can you contribute to the maintenance of green wealth of your locality? Make a list of actions to be taken by you.

Ans. We can contribute to the maintenance of green wealth of our locality by the following actions:

(i) We should grow more and more trees on the other side of the road.

(ii) We should discourage the cutting of trees.

(iii) The government should make laws to prevent the excessive cutting of trees.

(iv) Parks should be made in a particular area.

Q. 8. Explain how deforestation leads to reduce rainfall.

Ans. Trees emit a large amount of water in form of water vapour during transpiration. Depletion of water vapour affects cloud formation and results in less rain fall.

Q. 9. Why should paper be saved? Prepare a list of ways by which you can save paper.

Ans. We should save paper:

(i) to save forest trees from being cut down.

(ii) to save water used in paper making.

(iii) to save energy (electricity) used in making paper. and

(iv) To reduce the amount of harmful chemicals used in paper making.

Ways of Saving Paper:

(i) Write on both sides of a paper.

(ii) Reuse the paper.

(iii) Leave less margin.

(iv) Make toys, caps etc., out of used papers.

Q. 10. Complete the word puzzle:

Down

1. Species on the verge of extinction.

2. A book carrying information about endangered species.

5. Consequence of deforestation.

Across

1. Species which have vanished.

2. Species found only in a particular habitat.

4. Variety and variability of a plant, animal and microorganisms.

Ans.

Q. 11. Find out about the national parks in your state. Identify and show their location on the outline map of India.

Ans. See Map.