Two biologically important compounds that contain both oxygen and nitrogen are: (i) Amino acids (ii) Deoxyribonucleic acid (DNA) and Ribonucleic acid (RNA) For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-14/
Two biologically important compounds that contain both oxygen and nitrogen are:
(i) Amino acids
(ii) Deoxyribonucleic acid (DNA) and Ribonucleic acid (RNA)
During the water cycle, water is found in solid state (snow, ice, etc.), liquid state (ground water, river water, etc.), and gaseous state (water vapours). For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-14/
During the water cycle, water is found in solid state (snow, ice, etc.), liquid state (ground water,
river water, etc.), and gaseous state (water vapours).
The methods of preventing or reducing soil erosion are: (i) Prevention of deforestation (ii) Plantation of trees For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-14/
The methods of preventing or reducing soil erosion are:
(i) Prevention of deforestation
(ii) Plantation of trees
The blowing away or washing away of land surface by wind or water is known as soil erosion. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-14/
The blowing away or washing away of land surface by wind or water is known as soil erosion.
Soil is formed by breaking down of rocks at or near the surface of the Earth through various physical, chemical, and biological processes by various factors such as the sun, water, wind and living organisms. (i) Sun: During day time, the rocks are heated. This causes the rocks to expand. During nighRead more
Soil is formed by breaking down of rocks at or near the surface of the Earth through various
physical, chemical, and biological processes by various factors such as the sun, water, wind and
living organisms.
(i) Sun: During day time, the rocks are heated. This causes the rocks to expand. During night time,
these rocks cool down and contract. Since all parts of the rock do not undergo expansion and
contraction at the same rate, this causes the formation of cracks in these rocks. These cracks lead
to the breaking up of huge rocks into smaller pieces.
(ii) Water: Water catalyses the process of formation of soil in two ways.
(a) Water goes into the cracks and crevices formed in the rocks. When this water freezes,
its volume increases. As a result, the size of the cracks also increases. This helps in the weathering
of rocks.
(b) Running water wears away hard rocks over long periods of time. Water moving in fast
speed carries big and small particles of rock downstream. These rocks rub against each other,
resulting in breaking down of rocks. These smaller particles are carried away by running water
and deposited down its path.
(iii) Wind: Strong winds carry away rocks, which causes rubbing of rocks. This results in the
breaking down of rocks into smaller and smaller particles.
(iv) Living organisms: Some living organisms like lichens help in the formation of soil. Lichens
also grow on rocks. During their growth, lichens release certain substances, which cause the rock
surface to powder down forming a thin layer of soil. On this thin layer of soil, some small plants
like moss also grow. They further cause the breaking down of the rock particles.
The discharge of waste water from homes, industries, hospitals, etc. into the river pollutes this fresh water source. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-14/
The discharge of waste water from homes, industries, hospitals, etc. into the river pollutes this
fresh water source.
Organisms need water for the following reasons: (i) All cellular processes need water as a medium. Usually, the reactions that take place in our body or within the cells occur between substances that are dissolved in water. (ii) Since most of the substances are transported in a dissolved form, waterRead more
Organisms need water for the following reasons:
(i) All cellular processes need water as a medium. Usually, the reactions that take
place in our body or within the cells occur between substances that are dissolved in water.
(ii) Since most of the substances are transported in a dissolved form, water is necessary.
The following three human activities would lead to air pollution: (i) Burning of fossil fuels such as coal and petroleum (ii) Industrialization (iii) Deforestation For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-14/
The following three human activities would lead to air pollution:
(i) Burning of fossil fuels such as coal and petroleum
(ii) Industrialization
(iii) Deforestation
During day time, on being heated, a large amount of water evaporates from various water bodies and goes into the air. A part of this water vapour also reaches the atmosphere through biological activities such as transpiration and respiration. This causes the air in the atmosphere to heat up. When thRead more
During day time, on being heated, a large amount of water evaporates from various water bodies and goes into the air. A part of this water vapour also reaches the atmosphere through biological activities such as transpiration and respiration. This causes the air in the atmosphere to heat up.
When this heated air rises, it expands and cools, which results in the condensation of water vapour forming water droplets. The presence of dust and other suspended particles in air also facilitates the process of condensation. The formation of water droplets leads to the formation of clouds.
Name two biologically important compounds that contain both oxygen and nitrogen.
Two biologically important compounds that contain both oxygen and nitrogen are: (i) Amino acids (ii) Deoxyribonucleic acid (DNA) and Ribonucleic acid (RNA) For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-14/
Two biologically important compounds that contain both oxygen and nitrogen are:
(i) Amino acids
(ii) Deoxyribonucleic acid (DNA) and Ribonucleic acid (RNA)
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-14/
What are the different states in which water is found during the water cycle?
During the water cycle, water is found in solid state (snow, ice, etc.), liquid state (ground water, river water, etc.), and gaseous state (water vapours). For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-14/
During the water cycle, water is found in solid state (snow, ice, etc.), liquid state (ground water,
river water, etc.), and gaseous state (water vapours).
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-14/
What are the methods of preventing or reducing soil erosion?
The methods of preventing or reducing soil erosion are: (i) Prevention of deforestation (ii) Plantation of trees For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-14/
The methods of preventing or reducing soil erosion are:
(i) Prevention of deforestation
(ii) Plantation of trees
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-14/
What is soil erosion?
The blowing away or washing away of land surface by wind or water is known as soil erosion. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-14/
The blowing away or washing away of land surface by wind or water is known as soil erosion.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-14/
How is soil formed?
Soil is formed by breaking down of rocks at or near the surface of the Earth through various physical, chemical, and biological processes by various factors such as the sun, water, wind and living organisms. (i) Sun: During day time, the rocks are heated. This causes the rocks to expand. During nighRead more
Soil is formed by breaking down of rocks at or near the surface of the Earth through various
physical, chemical, and biological processes by various factors such as the sun, water, wind and
living organisms.
(i) Sun: During day time, the rocks are heated. This causes the rocks to expand. During night time,
these rocks cool down and contract. Since all parts of the rock do not undergo expansion and
contraction at the same rate, this causes the formation of cracks in these rocks. These cracks lead
to the breaking up of huge rocks into smaller pieces.
(ii) Water: Water catalyses the process of formation of soil in two ways.
(a) Water goes into the cracks and crevices formed in the rocks. When this water freezes,
its volume increases. As a result, the size of the cracks also increases. This helps in the weathering
of rocks.
(b) Running water wears away hard rocks over long periods of time. Water moving in fast
speed carries big and small particles of rock downstream. These rocks rub against each other,
resulting in breaking down of rocks. These smaller particles are carried away by running water
and deposited down its path.
(iii) Wind: Strong winds carry away rocks, which causes rubbing of rocks. This results in the
breaking down of rocks into smaller and smaller particles.
(iv) Living organisms: Some living organisms like lichens help in the formation of soil. Lichens
also grow on rocks. During their growth, lichens release certain substances, which cause the rock
surface to powder down forming a thin layer of soil. On this thin layer of soil, some small plants
like moss also grow. They further cause the breaking down of the rock particles.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-14/
Do you know of any activity which may be polluting this water source?
The discharge of waste water from homes, industries, hospitals, etc. into the river pollutes this fresh water source. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-14/
The discharge of waste water from homes, industries, hospitals, etc. into the river pollutes this
fresh water source.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-14/
What is the major source of fresh water in the city/town/village where you live?
River is a major source of fresh water. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-14/
River is a major source of fresh water.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-14/
Why do organisms need water?
Organisms need water for the following reasons: (i) All cellular processes need water as a medium. Usually, the reactions that take place in our body or within the cells occur between substances that are dissolved in water. (ii) Since most of the substances are transported in a dissolved form, waterRead more
Organisms need water for the following reasons:
(i) All cellular processes need water as a medium. Usually, the reactions that take
place in our body or within the cells occur between substances that are dissolved in water.
(ii) Since most of the substances are transported in a dissolved form, water is necessary.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-14/
List any three human activities that you think would lead to air pollution.
The following three human activities would lead to air pollution: (i) Burning of fossil fuels such as coal and petroleum (ii) Industrialization (iii) Deforestation For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-14/
The following three human activities would lead to air pollution:
(i) Burning of fossil fuels such as coal and petroleum
(ii) Industrialization
(iii) Deforestation
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-14/
How are clouds formed?
During day time, on being heated, a large amount of water evaporates from various water bodies and goes into the air. A part of this water vapour also reaches the atmosphere through biological activities such as transpiration and respiration. This causes the air in the atmosphere to heat up. When thRead more
During day time, on being heated, a large amount of water evaporates from various water bodies and goes into the air. A part of this water vapour also reaches the atmosphere through biological activities such as transpiration and respiration. This causes the air in the atmosphere to heat up.
When this heated air rises, it expands and cools, which results in the condensation of water vapour forming water droplets. The presence of dust and other suspended particles in air also facilitates the process of condensation. The formation of water droplets leads to the formation of clouds.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-14/