Class 9 science CHP 14 Q.3 ,4, 5, 6
plzz give these questions answer.
whose give me first answer then I will mark them brainliest
and those give irrelevant answer then I will report them.
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NCERT Solutions for Class 9 Science Chapter 14: Natural Resources
NCERT Solutions for Class 9 Science chapter 14 is mainly created to be a handy reference and guiding solution to help students clear doubts instantly and in an effective way. NCERT Solutions for Class 9 science includes the precisely solved questions and exercises for the best preparation for examinations.
NCERT Solutions for Class 9 science is prepared by the faculties having a lot of experience along with subject matter experts. Class 9 solution by NCERT is developed keeping in mind the concept-based approach along with the precise answering method for examinations. Refer NCERT Solutions for Class 9 for a better score. It is a detailed and well-structured solution contributed by NCERT board for the better understanding and a good grasp of the concept-based knowledge. NCERT for Class 9 Science Solutions is made available in web and PDF format for easy access.
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Access Answers of Science NCERT class 9 Chapter 14: Natural Resources (All intext and exercise questions solved)
In-text Question 1.1
1. How is our atmosphere different from the atmospheres on Venus and Mars?
Ans: Ans:
Earth’s atmosphere is composed of various gases like oxygen, carbon dioxide, nitrogen, water vapour along with various gases in small quantities, hence making it a balanced composition which is livable than other planets. Planets like Venus and Mars have more than 95% of carbon dioxide in the air making the existence of life impossible.
2. How does the atmosphere act as a blanket?
Ans:
⇒ It maintains the consistency in temperature throughout the day making it a comfortable place to stay.
⇒ The ozone in the atmosphere is responsible for maintaining the temperature without letting the harmful ultra-violet ray effect.
3. What causes winds?
Ans:
The uneven heating of the earth’s surface is the main cause for the winds. On being heated more the air raises up and hence low pressure is created. Hence the air in high pressure occupy the low-pressure region causing the wind.
4. How are clouds formed?
Ans:
During the day time in the presence of sunlight water from sources like well, lake, pond, sea, river and various other sources get evaporated and this water vapour rises up with the hot air. At a particular height, the air cools and the water vapour condenses to form minute droplets to form clouds.
5. List any three human activities that you think would lead to air pollution’
Ans:
⇒ Burning of fuels like petroleum, kerosene, and coal in the atmosphere
⇒ The smoke released from manufacturing industries
⇒ Smoke from vehicles
In-text Question 1.2
1. Why do organisms need water?
Ans:
Organisms need water for
⇒ Every cellular process need water
⇒ Photosynthesis in plants
⇒ Transportation of substances in the body takes place through water by dissolving the contents in water.
⇒ Required minerals are transported in Terrestrial animals through water and even to eliminate waste from the body water is used.
2. What is the major source of fresh water in the city/town/village where you live?
Ans:
⇒ Rainfall
⇒ Underground water from wells
⇒ Water sources like pond, river, and lake
⇒ Snowfall
3. Do you know of any activity which may be polluting this water Q source?
Ans:
⇒ Dumping waste in the river
⇒ Factory waste
⇒ Sewage
In-text Question 1.3
1. What are the different states in which water is found during the water cycle?
Ans:
Water is found in all three states like
⇒ A solid-state (Snow, ice)
⇒ Liquid state (river water, underground water)
⇒ Gaseous state (water vapour)
2. Name two biologically important compounds that contain both oxygen and nitrogen
Ans:
⇒ DNA (Deoxyribonucleic Acid)
⇒ RNA (Ribonucleic Acid)
⇒ Amino acids
3. List any three human activities which would lead to an increase in the carbon dioxide content of the air
Ans:
⇒ Breathing process where Carbon dioxide is released
⇒ Burning of petrol, coal, and fuel
⇒ Using fridge, air conditioners, and oven
4. What is the greenhouse effect?
Ans:
Gases like Carbon dioxide and methane trap sun’s radiation and does not allow it to go back and hence causing warming of the atmosphere, resulting in the greenhouse effect.