11. Air Around Us class 6 NCERT Notes for chapter 11 Science download in pdf

Air Around Us class 6: Exam Notes

Welcome to Air Around Us class 6 NCERT notes Chapter 10 Science NCERT Notes specially created by padhaiguru.in.

Introduction to Air

• Importance of Air for Living Things: All living things require air for survival. While we can’t see air, we can feel its effects in various ways.
• Observable Effects of Air: Air’s presence is evident through rustling leaves, swaying clothes on a clothesline, fluttering book pages due to fan air, flying kites, etc.

Properties of Air

Air in Motion

• Wind Effects: Air in motion is known as wind. It’s responsible for various phenomena, like the rotation of kites and the operation of windmills.

Air’s Occupancy and Transparency

• Air Occupies Space: Demonstrated through an activity involving an empty bottle. Even when inverted, the bottle contains air, which occupies space.
• Invisible but Transparent: Air is colorless and transparent, allowing us to see through it. This transparency enables visibility.

Composition of Air

Components of Air

• Components of Air: Air is a mixture of various gases. The main components include water vapor, oxygen, nitrogen, carbon dioxide, and other trace gases.
• Water Vapor: Contributes to the water cycle and condenses on cool surfaces.
• Oxygen: Supports combustion and is essential for respiration in living organisms.
• Nitrogen: Makes up a significant portion of air and doesn’t support combustion.
• Carbon Dioxide: Present in small amounts; produced by animals and plants and released during burning.
• Dust and Smoke: Particles present in the air due to combustion and industrial processes.

Availability of Oxygen to Organisms

• Dissolved Oxygen: In water, animals utilize dissolved oxygen for respiration.
• Soil Air: Organisms in the soil and plant roots respire using the air present in the soil.
• Importance of Soil Air: Air-filled spaces in soil enable respiration for underground organisms.

Oxygen Replacement in the Atmosphere

• Photosynthesis: Plants produce oxygen through photosynthesis. While they consume oxygen, they produce more than they use.
• Interdependence of Plants and Animals: Oxygen balance in the atmosphere is maintained through the exchange between plants and animals.

Uses and Importance of Air

• Wind Energy: Windmills harness wind energy for various purposes, including drawing water and generating electricity.
• Movement: Air enables movements of yachts, gliders, parachutes, airplanes, birds, bats, and insects.
• Dispersal: Air plays a role in dispersing seeds and pollen, contributing to plant reproduction.
• Water Cycle: Air is a crucial element in the water cycle, facilitating processes like evaporation and condensation.

Keywords and Definitions:

• Wind: Air in motion.
• Photosynthesis: The process by which plants convert sunlight into energy, producing oxygen as a byproduct.
• Respiration: The process of exchanging gases, usually referring to oxygen intake and carbon dioxide release in living organisms.
• Combustion: The chemical reaction of a substance with oxygen, often accompanied by the release of heat and light.

Frequently Asked Questions (FAQs):

Q1: What is the significance of air in our daily lives?

A1: Air is essential for various reasons, including supporting life through respiration, enabling movements, and playing a role in natural processes like the water cycle.

Q2: How does air occupy space?

A2: An activity involving an inverted bottle submerged in water demonstrates that air occupies space as bubbles escape when the bottle is tilted.

Q3: What are the primary components of air?

A3: Air is a mixture of gases, primarily including nitrogen, oxygen, water vapor, carbon dioxide, and trace gases.

Q4: How does oxygen become available to aquatic animals?

A4: Aquatic animals utilize dissolved oxygen in water for respiration, which they extract from the surrounding water.

Q5: Why do plants and animals rely on each other for oxygen exchange?

A5: Plants produce oxygen through photosynthesis, which animals use for respiration. In return, animals produce carbon dioxide, which plants use for photosynthesis.

Q6: What is the role of windmills?

A6: Windmills harness wind energy to perform various tasks, such as pumping water and generating electricity.

Q7: How does air contribute to seed dispersal?

A7: Air helps disperse seeds by carrying them away from the parent plant, increasing the chances of new plant growth.

Q8: How does combustion affect the air?

A8: Combustion releases gases and particles into the air, contributing to air pollution and environmental impact.

Q9: Why do mountaineers carry oxygen cylinders?

A9: As altitude increases, the air becomes thinner and contains less oxygen. Mountaineers carry oxygen cylinders to ensure a sufficient supply of oxygen at high altitudes.

Q10: What role does air play in the water cycle?

A10: Air facilitates the water cycle by enabling processes like evaporation, condensation, and precipitation.

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