CBSE · NCERT · Class 8 Science · Chapter 5

NCERT Solutions: Class 8 Science Chapter 5 - Conservation of Plants and Animals

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Chapter-wise NCERT intext questions and exercise answers for Conservation of Plants and Animals, grounded in the official textbook.

Questions are taken verbatim from the NCERT textbook; answers were grounded against the chapter's content during generation. Items needing review are marked.
Sections in this chapter
Exercises 8
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1Exercises8 questions
Q.1Fill in the blanks: place where animals are protected in natural habitat; species found only in a particular area; migratory birds fly because of ___ changes.v
Answer:

Wildlife sanctuary; endemic species; climatic.

Q.2Differentiate between wildlife sanctuary and biosphere reserve, zoo and wildlife sanctuary, endangered and extinct species, flora and fauna.v
Answer:

A wildlife sanctuary protects wild animals in their natural habitat; a biosphere reserve conserves biodiversity and traditional life over a larger area. A zoo keeps animals in artificial enclosures; a sanctuary protects them in nature. Endangered species are at risk of extinction; extinct species no longer exist. Flora means plants of an area; fauna means animals of an area.

Q.3Discuss effects of deforestation on wild animals, environment, rural areas, urban areas, earth and the next generation.v
Answer:

Deforestation destroys habitats, reduces rainfall, increases temperature and carbon dioxide, causes soil erosion, floods and droughts, reduces groundwater and biodiversity, and leaves fewer resources and a degraded environment for future generations.

Q.4What will happen if we go on cutting trees?v
Answer:

There will be loss of biodiversity, soil erosion, reduced rainfall, increase in carbon dioxide, global warming, floods, droughts and desertification.

Q.5What will happen if the habitat of an animal is disturbed?v
Answer:

The animal may lose food, shelter and breeding places. Its population may decline and it may become endangered or extinct.

Q.6What will happen if the top layer of soil is exposed?v
Answer:

The fertile topsoil can be removed by wind and water, reducing fertility and causing desertification.

Q.7Answer briefly: why conserve biodiversity, why protected forests may not be completely safe, how tribals depend on jungle, causes and consequences of deforestation, Red Data Book and migration.v
Answer:

Biodiversity must be conserved to maintain ecological balance and resources. Protected forests may still face poaching and human interference. Tribals depend on forests for food, fuel, medicine and livelihood. Deforestation is caused by agriculture, industry, roads, housing and forest fires; it causes erosion, floods, droughts and loss of species. The Red Data Book records endangered species. Migration is periodic movement of animals or birds to another region for better climate, food or breeding.

Q.8Trees are being continually cut to meet demands in factories and for shelter. Is it justified? Discuss.v
Answer:

Cutting trees may be needed for essential development, but uncontrolled cutting is not justified because it harms biodiversity, climate, soil and water. Development should use minimum forest land, reforestation, recycling, protected areas and sustainable planning.