Balbharati Class 5 Environmental Studies Part 1 Solutions Chapter 18 The Environment and Us
Welcome to NCTB Solutions. Here with this post we are going to help Maharashtra State board 5th class students by providing Balbharati Class 5 Environmental Studies Part 1 Solutions for Chapter 18, The Environment and Us. Here students can easily find all the answers for the questions in The Environment and Us. Also our Expert Environmental Studies Teacher’s solved all the question answer with easily understandable language with proper guidance so that all the students can understand easily. Here on this post students will get chapter 18 The Environment and Us solutions. Here all the Question Answer are based on Balbharati latest syllabus. Here all the question and answer are based on Maharashtra State Board latest syllabus.
The Environment and Us Exercise question Solutions :
Question no – (2)
Answer :
Kite is a raptorial bird, who kills the birds and smaller rodents. The dead and decomposing matter acts as a food for their consumption. These smaller rodents will expand in their numbers, if there is non-existence of kites. As kites are the bird of prey, so they does not act as a food for others. There will be a minute difference in any other animal’s population, if there is a decline in the number of kite’s.
Question no – (3)
Answer :
(a) Migration refers to the temporary or permanent movement of animals from one place to another place for the purpose of feeding or reproducing it. Animals portray the migratory behavior.
(b) The natural environment which is comprised of dense and heavy vegetation are the most favorable place for birds to stay and they also built their nests on the top branches of the trees. In order to lay eggs, both the parents build the nest. Until the young ones hatches out of the eggs, she breeds the eggs for quite some period of time. Both the parents takes care of the hatchlings. Both the parents feed their young ones. The moment their wings are fully developed and they are capable of flying, they depart the nest and fly away from the parents.
(c) Two causes of air pollution are :
1st reason : Fuel is used in almost all homes. Apart from that, there are several major industries and factories where fuel is used to a great extent. However, due to burning of fuels, great quantities of carbon dioxide infiltrate the air. Fuels are burnt in factories and industries and it is also used in vehicles which gives rise to smoke and poisonous gases into the air, which is one of the primary reason of air pollution.
2nd reason : Due to massive deforestation, there are insufficient quantities of trees for absorbing carbon dioxide. So as a result of which, the percentage of carbon dioxide in the air is surging in a continuous manner which precedes the increase in temperature. An increase in the level of temperature is noticed in almost every parts of the world. This is another reason of air pollution.
(d) The land which is acquired after clearing the forests are used for agricultural purposes, building houses, manufacturing factories and also for building roads, bridges and railways. In order to make place for them, forests are also demolished. Since, there is an increase in the growth of world’s population, hence, there is more frequent requirement of land for all such kind of activities.
Question no – (4)
Answer :
(a) It is important to conserve the living components of the environment
Reasons :
It is essential to conserve the living components of the environment for the proper functioning of the food chain and food web. If there is non-existence of the living components, then some species will no longer exist. As a result of human interferences in nature, tremendous changes are occurring in the air, water and land. Consequently, these non-living components are getting prone to pollution, due to which there is a threatening effect on the existence of living things, although various other living things have already become obsolete. The environmental factors are interrelated with each other, so if one factor is damaged then it brings about an affect on it’s relationship with other factors and as a result of which there is a disturbance in the environmental balance. Perpetually, some of the living things on the earth are going on their way to extinction. This poses a great risk for the entire living world. So it is necessary to conserve the living components of the environment.
(b) The numbers of wild animals are falling day by day
Reasons :
Many food chains and food webs are getting disturbed due to the human interferences. In order to increase the availability of land, the forests are destroyed to a large extent. The rapid climatic changes and global warming are posing great threat to the natural cycles, as a result making it difficult for the wild animals to survive. Hunting and poaching of wild animals are the two primary reasons for the significant decline of their numbers. Each of these factors are responsible for the falling of the number of wild animals.
Question no – (5)
Answer :
(a) Dead plants and animals are abiotic components.
This statement is absolutely True.
Dead plants and animals are non-living or abiotic components.
(b) It is necessary to conserve biodiversity.
This statement is completely True.
It is essential to conserve biodiversity.
Question no – (6)
Answer :
Natural :
• Soil
• Horse
• Stone
• Water hyacinth
• Sunlight
• Dolphin
• Water
• Cotton wool
• Trees.
Man-made :
• Book
• Pen
• Chair
• Table
• Brick.
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