To make an effective preparation for an exam, one should have a clear understanding of all the concepts and topics to be tested in that exam. This can be achieved by a thorough learning of each topic and an intensive practice of the questions based on those topics. NCERT books are considered to be the best source for strengthening the fundamentals of a subject and clearing all the concepts. Moreover, the different types of questions given in NCERT books are perfect to assess your learning. Practicing these questions help to gain confidence for writing perfect answers in exams.
To help students access precise and comprehensive answers, we are providing NCERT solutions for Class 9 Science. All these solutions have been explained by the subject experts and are certain to help students learn the right technique to write perfect answers in the annual exams.
In this article we are providing the NCERT solutions for Class 9 Science chapter 14, Natural Resources. All these NCERT solutions have been reviewed to provide you the error free content which will make it easy for you to prepare easily and effectively for the annual exams.
Main topics discussed in Class 9 Science chapter- Natural Resources are:
- Air and winds
- The role of the atmosphere in climate control
- Rain
- Air pollution
- Water and its pollution
- Mineral riches in the soil
- Biogeochemical cycles:
Water-cycle
Nitrogen-cycle
Carbon-cycle
Oxygen-cycle
- Ozone Layer.
Students may download all the NCERT Solutions for CBSE Class 9 Science chapter – Natural Resources, in the form of PDF.
Some of the questions and their solutions from NCERT Solutions for Class 9: Natural Resources, are as follows:
Q. How does the atmosphere act as a blanket?
Sol.
The atmosphere acts as a blanket by performing the following functions:
(a) It keeps the average temperature of the Earth fairly constant during day time and even during the course of whole year.
(b) It prevents a sudden increase in the temperature during day time.
(c) It slows down the escape of heat from the surface of the Earth into outer space during night time.
Q. How are clouds formed?
Sol.
During the day time, water evaporates from water bodies and goes into the atmosphere. Air also becomes hot due to sunlight and starts rising up taking along with water vapour. As the air rises up, it expands and cools. This cooling of air causes water vapour in the air to condense. The process of condensation of water occurs. Small droplets grow and become big by more and more condensation of other droplets of water. These steps form the clouds.
Q. What is the major source of freshwater in the city/town/village where you live?
Sol.
Underground water is the major source of water in city/town/village. It is drawn with the help of hand pumps and tube-wells. The other nearby sources are rivers, lakes and ponds.
Q. What is soil erosion?
Sol.
Removal of top layer soil is known as soil erosion. It is rich in humus and nutrients. The agents of soil erosion are mainly flowing water or wind. Land becomes infertile if this process occurs for long time and the reason for the same is the loss of its valuable nutrients.
Q. You have seen weather reports on television and in newspapers. How, do you think we are able to predict the weather?
Sol.
Meteorologists collect information regarding the pattern of temperature, speed of wind, air presser and all other features which influence weather. All these information are collected by remote sensing and weather forecast satellites. This information is then compiled in meterological departments which prepare a weather report that is displayed on the maps. This information is further transmitted through radio, television and newspaper.
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