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Air and Water - 2 Class 1 Worksheet EVS

Q1: Fill in the Blanks.

(i) Air is a mixture of _______ gases.
Ans:
Air is a mixture of different gases.
Air is not composed of a single gas but is a combination of various gases, including nitrogen, oxygen, carbon dioxide, and others.
Air and Water - 2 Class 1 Worksheet EVS

(ii) The most abundant gas in the air is _______.
Ans: 
The most abundant gas in the air is nitrogen.
Nitrogen makes up about 78% of the Earth's atmosphere, making it the most abundant gas.

(iii) The process of taking in air containing oxygen into the body and giving out carbon dioxide is called _______.
Ans:
The process of taking in air containing oxygen into the body and giving out carbon dioxide is called respiration.
Respiration is the process by which living organisms inhale oxygen and exhale carbon dioxide.

(iv) The layer of gases surrounding the Earth is known as the ________.
Ans:
The layer of gases surrounding the Earth is known as the atmosphere.
The atmosphere is the layer of air surrounding our planet, held in place by gravity.
Air and Water - 2 Class 1 Worksheet EVS

(v) _______ is the process by which water changes into water vapor.
Ans:
Evaporation is the process by which water changes into water vapor.
Evaporation occurs when water is heated and changes from a liquid to a gaseous state, rising into the atmosphere.

Q2: Match the Column.


Match the items in Column A with their respective descriptions in Column B.
Air and Water - 2 Class 1 Worksheet EVSAns:
Oxygen - d.
Responsible for photosynthesis in plants
Oxygen is essential for the process of photosynthesis in plants, during which they produce glucose and release oxygen.
Carbon dioxide - b. Most abundant gas in the Earth's atmosphere
Carbon dioxide is present in the Earth's atmosphere and contributes to the greenhouse effect.
Gills - e. Organs for breathing in fish and amphibians
Gills are respiratory organs in fish and amphibians that allow them to extract oxygen from water.
Evaporation - c. Process of converting water into vapor
Evaporation is the process of converting liquid water into water vapor, which then rises into the atmosphere.
Chlorophyll - a. Essential for the survival of aquatic life
Chlorophyll is a green pigment found in plants that plays a vital role in photosynthesis, not directly related to aquatic life.

Q3: True or False.

(i) Air is composed of only one gas.
Ans:
False
Air is a mixture of multiple gases, including nitrogen, oxygen, carbon dioxide, and others.

(ii) All living organisms need air to survive.
Ans: 
True
All living organisms require oxygen present in the air to carry out respiration, a vital process for survival.

(iii) The ozone layer protects us from harmful ultraviolet rays of the sun.
Ans:
True
The ozone layer in the atmosphere absorbs harmful ultraviolet radiation from the sun, protecting life on Earth.

(iv) Ice is an example of water in the liquid state.
Ans: 
False
Ice is the solid state of water, not the liquid state. Water in its liquid state is found at room temperature.
Air and Water - 2 Class 1 Worksheet EVS

(v) Plants release oxygen during photosynthesis.
Ans: 
True
During photosynthesis, plants produce oxygen as a byproduct, which is released into the atmosphere.

Q4: Arrange in Correct Order.


Arrange the following steps in the correct order to explain the water cycle.
(a) Precipitation
(b) Evaporation
(c) Condensation
(d) Collection
(e) Runoff
Ans: The correct order of the water cycle is as follows:
(b) Evaporation
(c) Condensation
(a) Precipitation
(d) Collection
(e) Runoff

  • Evaporation: Water from oceans, lakes, and rivers evaporates due to heat from the sun, turning into water vapor.
  • Condensation: The water vapor rises, cools, and condenses to form tiny water droplets, creating clouds.
  • Precipitation: The water droplets in clouds combine and fall back to the Earth's surface as rain, snow, sleet, or hail.
  • Collection: The water accumulates on the Earth's surface, forming rivers, lakes, and other bodies of water.
  • Runoff: Excess water flows over the land and returns to the oceans, completing the water cycle.

Q5: Choose the Odd One Out.


(i) Nitrogen, Oxygen, Water Vapor, Carbon Dioxide
Ans:
Water Vapor
Nitrogen, oxygen, and carbon dioxide are gases present in the Earth's atmosphere, while water vapor is water in its gaseous form.
Air and Water - 2 Class 1 Worksheet EVS

(ii) Lake, River, Pond, Glacier
Ans: 
Glacier
A glacier is a large mass of ice, while the other options are bodies of water.

(iii) Respiratory System, Circulatory System, Digestive System, Solar System
Ans: 
Solar System
The first three options are human body systems, while the last option refers to our solar system.

(iv) Boiling, Freezing, Melting, Condensation
Ans:
Condensation
Boiling, freezing, and melting are processes related to changes in a substance's state, whereas condensation is the process of gas turning into liquid.
Air and Water - 2 Class 1 Worksheet EVS

(v) Atlantic, Pacific, Indian, Earth
Ans:
Earth
The first three options are names of oceans, while "Earth" is the name of our planet.

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