NCERT Solutions for Class 9 Science Chapter 14
NCERT Solutions for Class 9 Science Chapter 14 Natural Resources intext questions given on Page 193 or Page 194 or Page 196 or Page 201 and Exercises in English Medium updated for academic session 2020-2021 free to download in PDF.Download Class 9 Science Chapter 14 in Hindi Medium. Download पेज 217 के उत्तर or पेज 219 के उत्तर or पेज 222 के उत्तर or पेज 226 के उत्तर and अभ्यास के प्रश्न उत्तर in PDF format free. Class 9 Science NCERT Answers of all chapter in downloadable form are being provided so that students can use it offline also. NCERT Solutions 2020-21 and NCERT Solutions Apps for all subjects are given at one place.
NCERT Solutions for Class 9 Science Chapter 14
|Subject:||Science – विज्ञान|
|Chapter 14:||Natural Resources|
9th Science Chapter 14 Answers in English & Hindi Medium
CBSE NCERT Solutions for Class 9 Science Chapter 14 Natural Resources Intext Questions and exercises question answers are given below to study online as well as download in PDF form free. All the solutions are in updated form as per requirement of the students. NCERT Solutions Offline Apps 2020-21 are also based on latest NCERT Books 2020-2021.
9th Science Chapter 14 Answers English Medium
9th Science Chapter 14 Answers Hindi Medium
9th Science Chapter 14 Answers PDF Form
Explain the role of atmosphere in climate control.
Atmosphere maintains temperature of the earth suitable for the living organisms during day time and whole life. It prevents sudden increase in temperature during day time as well as night. Life does not exist on other planets due to absence of the atmosphere.
Explain the role of sun in the formation of soil. Justify. “Dust is a pollutant”.
Role of Sun: Sun heats up rocks during the day time by which they expands. During night, rocks cool down and contract. Since all the parts of rocks do not expand and contract at the same rate, this results in the formation of cracks and ultimately the huge rock breaks up into smaller pieces.
Dust as a pollutant:
(i) It suspends in air which can cause allergy and respiratory problems.
(ii) It covers stomata of plants and affects exchange of gases and retards plant growth.
(iii) It can causes irritation in eyes.
(iv) It can act as a carrier of vapours of lead and other heavier metals which are toxic.
What causes wind?
Uneven heating of air over land and water bodies causes wind.
How are clouds formed?
(a) When water bodies are heated during day time, a large amount of water evaporates and goes into air.
(b) The hot air rises up carrying water vapours with it.
(c) As air rises, it expands and cools.
(d) This cooling causes the water vapour in the air to condense in the form of tiny droplets and form clouds.
Why do organisms need water?
(i) Water in needed for all cellular activities.
(ii) Transportation of nutrients takes place with the help of water.
(iii) Plants require water for photosynthesis.
(iv) Our body contains 70% of water which maintains body temperature.
Rivers from land, add minerals to sea water. Discuss how?
Rivers passes through land and rocks which contains minerals. The minerals get dissolved in water. Minerals are carried by the river to sea water.
How do lichen and mosses help in formation of soil?
Lichens and moss grow on rocks. They release substances (chemical) which breakdown the stones into fine particles resulting in the formation of soil. The mode of action is chemical.
Questions for Practice on 9th Science Chapter 14
Explain oxygen cycle.
The cycle by which oxygen is circulated continuously in the atmosphere by living and non-living organisms is called oxygen cycle.
(a)Human beings and animals take oxygen from the atmosphere and release carbon dioxide and water.
(b)The dead organisms also need oxygen for their decomposition.
(c)Plants take up carbon dioxide and water for photosynthesis and release oxygen in the atmosphere.
(d)We must grow plants so as to keep the atmosphere rich in oxygen.
State two factors responsible for weathering of rocks.
(i) Uneven heating and cooling during day and night.
(ii) Flowing water breaks rocks into small pieces and take them along.
How is Carbon Dioxide fixed in atmosphere?
Plants take up carbon dioxide in photosynthesis to form carbohydrates. Carbon dioxide is returned to atmosphere by respiration in which carbohydrates produce carbon dioxide and water in the presence of oxygen. Carbon dioxide is also produced by the combustion of fossil fuels.
Important Questions on 9th Science Chapter 14
(i) Atmosphere keeps the average temperature of the Earth fairly constant during day time.
(ii) It prevents a sudden increase in temperature during day time.
(iii) It also slows down the escape of heat from the surface of the Earth into outer space during nighttime.
(i) Most biological reactions occur when substances are dissolved in water. Thus, all cellular processes need water as a medium to take place.
(ii) Transportation of biological substances needs water as a medium.
measured by anemometers. There are various instruments used to measure humidity.