Ncert Exemplar Solutions Class 7 Science Forests : Our Lifeline

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Ncert Exemplar Solutions Class 7 Science Forests : Our Lifeline

Welcome to NCTB Solutions. Here with this post we are going to help 7th class students for the Solutions of NCERT Exemplar Class 7 Science Book, Unit 17, Forests : Our Lifeline. Here students can easily find step by step solutions of all the problems for Forests : Our Lifeline, Also here our Science teacher’s are solved all the questions with easily understandable language with proper guidance so that all the students can understand easily.

Forests : Our Lifeline all Question Solutions :

Multiple Choice Questions :

Question no – (1)

Which of the following serve as green lungs?

Answer :

The correct answer is option – (b)

Forests serve as green lungs.

Question no – (2)

Boojho visited a forest near his town with his classmates and his teacher. As they were entering the forest, their class teacher told them not to make noise in the forest as noise could disturb the

Answer :

The appropriate answer is option – (c)

As noise could disturb the both birds and animals.

Question no – (3)

Which among the following forest animals is the smallest?

Answer :

The correct option is – (d)

Porcupine is the smallest.

Question no – (4)

Which of the following has the strongest stem?

Answer :

The answer is alternative – (a)

A tree has the strongest stem.

Question no – (5)

Which of the following is not prepared from the wood obtained from forest?

Answer :

The answer is option – (b)

Thermocol is not prepared from the wood obtained from forest.

Question no – (6)

Which of the following is not the name of a tree?

Answer :

The appropriate option is – (c)

Porcupine is not the name of a tree.

Question no – (7)

Pick the option which gives the names of a tree and an animal, respectively from the following.

Answer :

The appropriate option is – (a) semal, hornbill

Semal is the name of a tree and hornbill is the name of a animal.

Question no – (8)

Which of the products is not obtained from a forest?

Answer :

The correct option is – (d)

Ginger is not obtained from a forest.

Question no – (9)

The branchy part of a tree above the stem is known as

Answer :

The appropriate answer is alternative – (a)

The branchy part of a tree above the stem is known as Crown.

Question no – (10)

Forests are not responsible for

Answer :

The correct answer is option – (c)

Forests are not responsible for creating flood conditions.

Very Short Answer Questions :

Question no – (11)

Answer :

Paheli was not a able to observe noise pollution even though vehicles were passing through a nearby highway because the forest had a large number of trees which did a good job in absorbing the noise.

Question no – (12)

Answer :

(a) Forests influence climate, water cycle and air quality

This statement is True.

(b) In a forest, trees form the uppermost layer, followed by herbs. The shrubs form the lowest layer of vegetation.

This statement is False

Correct statement : In a forest , the trees form the uppermost layer, followed by shrubs. The herbs forms the lowest layer of vegetation.

(c) The forest keeps on growing and changing and can regenerate

This statement is True.

(d) Forests protect the soil from erosion

This statement is True.

Question no – (13)

Answer :

The correct order :

Grass → insects → frogs → snake → eagle

Short Answer Questions :

Question no – (14)

Answer :

The 4 birds that can be expected to be seen in a forest are toucan, parrots, jungle crow and woodpecker.

Question no – (15)

Answer :

No, they would not have seen the same types of plants and animals because every forest has its own climatic conditions and other factors that results in the variation of plants and animals that can survive in that climatic conditions.

Question no – (16)

Answer :

In a forest when animals dung covers the surface of the soil the microorganisms and other little organisms decompose the dungs to release it’s nutrients in the soil. These nutrients makes the soil fertile and is absorbed by the growing seeds. This is how a growing sapling benefits from animal dung.

Question no – (17)

Answer :

Column I	Column II
(A) Decomposers →	(iii) micro organisms
(b) Canopy →	(v) branches of tall tree
(c) Porcupine →	(iv) wild animal
(d) Humus →	(i) dead plant and animal tissues
(e) Forest →	(ii) habitats for wild life

Question no – (18)

Answer :

A tree binds the soils together and it’s roots help to absorb the incoming water and increase the ground water level in the soil. It maintains the water table throughout the year. So after the continuous cutting of trees, the soil faces difficulty in absorbing the rain water which flows to a nearby river or stream and causes flood.

Question no – (19)

Answer :

The other 4 useful products other than wood that we get from forest are oil , spices , rubber and medicines.

Long Answer Questions :

Question no – (21)

Answer :

The animals that die in the forest are usually eaten by other animals and the dry leaves and dead plants that fall on the surface are converted into rich humus by the microorganisms which are then absorbed by the nearby trees. Thus verifying the statement that nothing goes waste in the forest.

Question no – (22)

Answer :

The four factors which are responsible for the destruction of forest are

• Natural disaster like fire, earthquake, flood e.tc.

• Construction of road through the forest

• Deforestation of forest for wood

• Cutting of wood for building a residential area.

Question no – (24)

Answer :

A forest provide all its residents a safe place to live that is it acts a home for them. It also provides water to its residents in the form of stream and rivers, lakes and pond. Nonetheless ,there is no shortage of food in the forest. The herbivores feed on leaves and fruits, the Carnivore feed on the herbivores and the decomposers feed on dead plants and animals.

Question no – (25)

Answer :

Forest are our lifeline in the following ways –

• Forest provide us with wood , oxygen , spices, medicines and much other other things that we heavily depend on for our survival.

• Forest are the habitat for a large number of animals and plants that may go extinct in the absence of forest.

• It maintains the ground water level in the soil an thus prevents any possible floods.

• It lowers global temperature by absorbing the atmospheric carbon dioxide.

• The water is transpires rise up in the sky and later condenses and falls on earth bringing rain the nearby cites and areas.

Other Chapter Solutions :

👉 Nutrition in Plants

👉 Nutrition in Animals

👉 Fibre to Fabric