- A. 78%
- B. 21%
- C. 0.03%
- D. l%
(a) 78%
(a) 78%
- A. Stomata
- B. Chlorophyll
- C. Leaves
- D. Flowers
(a) Stomata
(a) Stomata
- A. Nitrogen
- B. carbon-di-oxide
- C. Oxygen
- D. water vapour
(c) Oxygen
(c) Oxygen
- A. provides colour to the food
- B. provides oxygen to the food
- C. adds proteins and minerals to the food
- D. keeps the food fresh
(d) keeps the food fresh
(d) keeps the food fresh
- A. I and II
- B. I and III
- C. II and IV
- D. I and IV
(d) I and IV
(d) I and IV
Oxygen(O 2 )
Oxygen(O 2 )
Oxygen (O 2 )
Tiny dust particles
Carbon dioxide (CO 2 )
Oxygen(O 2 )
Oxygen(O 2 )
Oxygen (O 2 )
Tiny dust particles
Carbon dioxide (CO 2 )
2. Plants require energy for their growth.
1. Plants manufacture food by a process called photosynthesis.
6. During this process, oxygen is released by plants.
3. Plants take in oxygen and release carbon-di-oxide just as animals.
5. Such oxygen is available to animals and human beings for breathing.
4. Plants take carbon-di-oxide from the atmosphere, use chlorophyll in the presence of sunlight and prepare food.
2. Plants require energy for their growth.
1. Plants manufacture food by a process called photosynthesis.
6. During this process, oxygen is released by plants.
3. Plants take in oxygen and release carbon-di-oxide just as animals.
5. Such oxygen is available to animals and human beings for breathing.
4. Plants take carbon-di-oxide from the atmosphere, use chlorophyll in the presence of sunlight and prepare food.
CO 2
CO 2
21% of air
21% of air
The production of O 2 and absorption of CO 2 and NH 3 will you reduced.
Plants provide shelter to fish, so, they feel insecure.
Algae growth will increase.
The production of O 2 and absorption of CO 2 and NH 3 will you reduced.
Plants provide shelter to fish, so, they feel insecure.
Algae growth will increase.
vMost of the fishes require both periods of light and darkness.
In a dark place, they will loose their sight and pigmentation.
Most of the fishes require both periods of light and darkness.
In a dark place, they will loose their sight and pigmentation.
Our earth is surrounded by a huge envelope of air called the atmosphere.
The atmosphere is made of five different layers – the Troposphere, the Stratosphere, the Mesosphere, the Ionosphere, and the Exosphere.
Our earth is surrounded by a huge envelope of air called the atmosphere.
The atmosphere is made of five different layers – the Troposphere, the Stratosphere, the Mesosphere, the Ionosphere, and the Exosphere.
Oxygen is present in the air spaces of soil. This O 2 is taken by root hairs through diffusion to the rest of the plant.
Oxygen is present in the air spaces of soil. This O 2 is taken by root hairs through diffusion to the rest of the plant.
Cover the person in a rug or blanket and Roll him on the floor.
This will cut off the air and put out the flames.
A suitable fire extinguisher can also be chosen.
Cover the person in a rug or blanket and Roll him on the floor.
This will cut off the air and put out the flames.
A suitable fire extinguisher can also be chosen.
Several health conditions and risk factors can lead to mouth breathing.
Snoring
dry mouth
daytime tired
Poor dental health
Several health conditions and risk factors can lead to mouth breathing.
Snoring
dry mouth
daytime tired
Poor dental health
During monsoon days, Water vapour from the atmosphere is absorbed in the biscuits. So the biscuits lose its crispness.
During monsoon days, Water vapour from the atmosphere is absorbed in the biscuits. So the biscuits lose its crispness.
Traffic assistants are continually exposed to smoke emitted out from the vehicles. Inhaling the pollutants in the smoke may cause breathing and lung problems. So they wear a mask on duty.
Traffic assistants are continually exposed to smoke emitted out from the vehicles. Inhaling the pollutants in the smoke may cause breathing and lung problems. So they wear a mask on duty.
plants in forests release oxygen through the process of photosynthesis and help in providing oxygen to animals for respiration.
Plants consume carbon dioxide released by the animals. In this way, plants help in maintaining a balance of oxygen and carbon dioxide in the atmosphere.
plants in forests release oxygen through the process of photosynthesis and help in providing oxygen to animals for respiration.
Plants consume carbon dioxide released by the animals. In this way, plants help in maintaining a balance of oxygen and carbon dioxide in the atmosphere.
The atmosphere is essential for life because it maintains an appropriate climate for the maintenance of life by carrying out the following activities:
The atmosphere keeps the average temperature of the Earth fairly constant during the day time.
It prevents a sudden increase in temperature during the day time.
It also slows down the escape of heat from the surface of the Earth into outer space during the night time.
The atmosphere is essential for life because it maintains an appropriate climate for the maintenance of life by carrying out the following activities:
The atmosphere keeps the average temperature of the Earth fairly constant during the day time.
It prevents a sudden increase in temperature during the day time.
It also slows down the escape of heat from the surface of the Earth into outer space during the night time.
It is because carbon-di-oxide (CO 2 ) does not support combustion. When sprayed on burning object it stops the supply of oxygen and controls the fire.
It is because carbon-di-oxide (CO 2 ) does not support combustion. When sprayed on burning object it stops the supply of oxygen and controls the fire.
- A. Hydrogen
- B. Oxygen
- C. Water vapour
- D. Carbon-di-oxide
(c) Water vapour
(c) Water vapour
- A. Combustion
- B. Burning
- C. Cherring
- D. Melting
(a) Combustion
(a) Combustion
- A. Lavoisier
- B. Ingenhousz
- C. Rutherford
- D. Joseph Priestley
(d) Joseph Priestley
(d) Joseph Priestley
Air is a composite mixture of many gases like N 2 , O 2 , CO 2 and others.
Air is a composite mixture of many gases like N 2 , O 2 , CO 2 and others.