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ScienceClass 6CBSE

Water Conservation

Water is a limited resource, so it must be used wisely. We can conserve water by: Avoiding wastage Repairing leaking taps Using water carefully in daily activities Not polluting rivers and ponds Practicing rainwater harvesting Planting trees and protecting forests

ScienceClass 6CBSE

Uses of Water

Water is used in many ways in our daily life: Drinking, cooking, bathing, and cleaning Agriculture for growing crops Industries for manufacturing processes Generating electricity (hydropower)

ScienceClass 6CBSE

Everyday Observations Related to Water

We often observe condensation in daily life. For example, when we breathe on spectacles, they become wet because water vapour in our breath condenses on the cooler glass surface. Similarly, when a cold water bottle is taken out of a refrigerator, water droplets form around it. This happens because water vapour in the surrounding air condenses on the cold surface of the bottle.

ScienceClass 6CBSE

Importance of Dissolved Oxygen

Fish and aquatic plants survive in water because it contains dissolved oxygen. Although oxygen is only slightly soluble in water, it is sufficient for aquatic organisms to breathe and live.

ScienceClass 6CBSE

Natural Phenomena Related to Water

Fog is formed when water vapour condenses on dust particles near the surface of the Earth, especially during winter. It appears as a thick cloud close to the ground. Floods are caused by excessive rainfall, leading to overflow of rivers and water bodies. On the other hand, droughts occur when there is no rainfall for a long period (usually a year or more), resulting in severe water shortage. During droughts, people face many problems such as lack of drinking water, shortage of food, and death of plants and animals. It becomes difficult to sustain life in such conditions.

ScienceClass 6CBSE

Special Water Processes

Transpiration is the process by which plants release excess water into the air through tiny pores in their leaves. This water vapour contributes to the water cycle. Rainwater harvesting is the method of collecting and storing rainwater for future use. It helps conserve water and is especially useful in areas facing water scarcity. Water is called a universal solvent because it can dissolve many substances like salts, minerals, and gases. This property makes water very useful in daily life and industrial processes.

ScienceClass 6CBSE

Forms and Sources of Water

Water exists in three states: Solid (Ice) Liquid (Water) Gas (Water vapour) Natural sources of water include rivers, lakes, oceans, ponds, wells, and streams. Water found on the surface of the Earth, such as rivers and lakes, is called surface water, while water stored underground in wells and aquifers is known as groundwater. However, sea water is not suitable for drinking because it contains a large amount of dissolved salts, making it salty and unsafe for direct consumption.

ScienceClass 6CBSE

Evaporation, Condensation, and Water Cycle

Evaporation is the process by which water changes into water vapour due to heat, especially on sunny days. When the sun heats water bodies like rivers, lakes, and oceans, water slowly turns into vapour and rises into the atmosphere. Condensation is the opposite process of evaporation. It occurs when water vapour cools down and changes back into liquid water. This happens when vapour comes in contact with cooler surfaces or air. For example, clouds are formed due to condensation of water vapour. The water cycle is the continuous circulation of water between the Earth’s surface and the atmosphere. It includes processes like evaporation, condensation, and rainfall. This cycle ensures a constant supply of fresh water on land, making it essential for life.

ScienceClass 6CBSE

Water and Its Processes – Explanation

Water is one of the most essential natural resources on Earth. It is necessary for the survival of all living beings, including humans, animals, and plants. Water exists in different forms and continuously moves in nature through various processes such as evaporation, condensation, and precipitation.

ScienceClass 6CBSE

What are the properties of light?

Light shows several important properties: Light travels in a straight line: This property is known as rectilinear propagation of light. It explains why shadows are formed and why we cannot see around corners. Formation of shadows: When light is blocked by an opaque object, a shadow is formed behind it. The shape of the shadow depends on the object. Reflection of light: Light can bounce back from surfaces like mirrors, allowing us to see images. Light does not require a medium: It can travel through a vacuum, such as space.

ScienceClass 6CBSE

Name three natural and artificial sources of light.

Natural sources of light: Sun Firefly Dragon fish Artificial sources of light: Electric bulb Candle Gas lamp

ScienceClass 6CBSE

Distinguish between transparent and translucent objects.

Transparent Objects Translucent Objects Allow most light to pass through Allow only some light to pass Objects can be seen clearly Objects appear blurred Examples: glass, air Examples: butter paper, wax

ScienceClass 6CBSE

State the laws of reflection.

The angle of incidence is equal to the angle of reflection. The incident ray, reflected ray, and the normal at the point of incidence all lie in the same plane. These laws explain how light behaves when it strikes a reflective surface.

ScienceClass 6CBSE

Give two effects of light on plants.

Plants use light to prepare their food through the process of photosynthesis. Light acts as a stimulus for plants, helping them grow towards the direction of light (a phenomenon called phototropism).

ScienceClass 6CBSE

How can you convert a transparent glass sheet into a translucent sheet?

A transparent glass sheet can be made translucent by reducing the amount of light passing through it. This can be done by: Covering one side of the glass with butter paper. Placing a thin plastic sheet over it. Scratching or roughening the surface slightly. These methods scatter the light, making the glass translucent.

ScienceClass 6CBSE

What is reflection of light?

Reflection of light is the bouncing back of light rays when they strike a smooth and shiny surface, such as a mirror. When light falls on such a surface, a part of it returns into the same medium. This is how images are formed in mirrors.

ScienceClass 6CBSE

In a completely dark room, can you see your reflection in a mirror?

No, we cannot see our reflection in a mirror in a completely dark room. This is because light is necessary for vision. When there is no light, no rays are reflected from our body or the mirror to our eyes, making it impossible to see anything.

ScienceClass 6CBSE

What is umbra?

Umbra is the darkest part of a shadow where light from the source is completely blocked by an object. In this region, no light reaches at all. It forms when an opaque object completely obstructs the path of light.

ScienceClass 6CBSE

What are opaque materials?

Opaque materials are those that do not allow light to pass through them at all. These materials completely block light, so objects behind them cannot be seen. Examples include wood, metal, and stone.

ScienceClass 6CBSE

What are translucent materials?

Translucent materials allow only some light to pass through them. As a result, objects seen through them appear blurred or unclear. They partially block light. Examples include wax paper, frosted glass, and thin plastic sheets.

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