CBSE NCERT Solutions for Class 8 Science Chapter 7

These solutions for NCERT class 8 science is extremely useful for the students as they no longer need to pile up their doubts and can clear instantly. It helps them to understand the concepts better and develop problem-solving abilities.

CBSE NCERT Solutions for Class 8 Science Chapter 7:

Question-1:

Discuss the effects of deforestation on the following.
a) Wild animals
b) Environment
c) Villages (Rural Areas)
d) Cities (Urban Areas)
e) Earth
f) The next generation

Solution:

a) Wild animals: When forests are cut, the natural habitat of the animals is destroyed. The animals are left with no place to live and breed. As a result of this many animals are at the verge of extinction.
b) Environment: Environment is adversely affected by deforestation as ecological balance is disturbed. Carbon dioxide is not absorbed by plants and it gets accumulated in the atmosphere to cause global warming which increases the temperature of earth and disturb water cycle.
c) Villages (Rural Areas): Deforestation leads to soil erosion and results in flash floods. This hampers agricultural activities and thus disturbs the people in rural areas.
d) Cities (Urban Areas): Deforestation in cities can increase the risk of many natural calamities such as floods and droughts in that area.
e) Earth: The whole earth is full of various ecosystems which together make the biosphere. Deforestation disturbs the balance in the biosphere. It disturbs climatic patterns.
f) The next generation: They will not be able to see wide variety of flora and fauna also not get clean and cool environment. They will have to breathe poisonous gas. Life would be very difficult for the next generation.

Question-2:

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

Solution:

No. It is not at all justified to cut trees to meet the ever increasing demands of human population. Forests are the habitat of several organisms including wild animals. They provide us with good quality air as they give out O2 and absorb the harmful CO2 gas from the atmosphere. In the process, they prevent the excessive heating of the atmosphere. They prevent soil erosion and natural calamities such as floods and droughts. They increase the fertility of the soil and help conserve biodiversity. The cutting of forests to meet the demands of growing human population
will lead to global warming, soil erosion, greenhouse effect, droughts, floods, and many more problems. The destruction of forests will disturb the balance of nature. Hence, forests must be conserved.

Question-3:

Explain how deforestation leads to reduced rainfall.

Solution:

Plants absorb water from the soil and evaporates it to form clouds. Deforestation leads to cutting down of trees. As a result less water is absorbed from the soil and it disturbs the water cycle. The formation of clouds becomes difficult which leads to reduced rainfall.