The undesirable plants may grow naturally along with the crop are called weeds. There are many ways to remove weeds and control their growth. Weeds can be removed by uprooting or cutting them close to the ground, from time to time. This is done with the help of a khurpi. Weeds are also controlled byRead more
The undesirable plants may grow naturally along with the crop are called weeds. There are many ways to remove weeds and control their growth. Weeds can be removed by uprooting or cutting them close to the ground, from time to time. This is done with the help of a khurpi.
Weeds are also controlled by using certain chemicals, called weedicides, like 2, 4–D. These are sprayed in the fields to kill the weeds.
Soil supplies mineral nutrients to the crop. These nutrients are essential for the growth of plants. Continuous growing of crops in the same field makes the soil poorer in certain nutrients. This makes the soil infertile. And then, to replenish the soil with nutrients farmers need to add manures toRead more
Soil supplies mineral nutrients to the crop. These nutrients are essential for the growth of plants. Continuous growing of crops in the same field makes the soil poorer in certain nutrients. This makes the soil infertile. And then, to replenish the soil with nutrients farmers need to add manures to the soil.
Wheat is a rabi crop, hence it requires cold climatic conditions to be grown properly. If it is sown in the kharif season, it will not grow or may get destroyed due to excessive rains in the kharif season. https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-1/
Wheat is a rabi crop, hence it requires cold climatic conditions to be grown properly. If it is sown in the kharif season, it will not grow or may get destroyed due to excessive rains in the kharif season.
The supply of water to crops at different intervals is called irrigation. The two methods of irrigation which conserve water are as follows: (i) Sprinkler System: Under this method, the perpendicular pipes, having rotating nozzles on top, are joined to the main pipeline at regular intervals. When waRead more
The supply of water to crops at different intervals is called irrigation. The two methods of irrigation which conserve water are as follows:
(i) Sprinkler System:
Under this method, the perpendicular pipes, having rotating nozzles on top, are joined to the main pipeline at regular intervals. When water is allowed to flow through the main pipe under pressure with the help of a pump, it escapes from the rotating nozzles. It gets sprinkled on the crop as if it is raining.
(ii) Drip system:
In this system, the water falls drop by drop just at the position of the roots. It is the best technique for watering fruit plants, gardens and trees. Water is not wasted at all. It is a boon in regions where availability of water is poor.
The main Differences between Fertiliser and Manure are as follows: Fetilisers: 1. A fertiliser is an inorganic salt. 2. A fertiliser is prepared in factories. 3. A fertiliser does not provide any humus to the soil. 4. Fertilisers are very rich in plant nutrients like nitrogen, phosphorus and potassiRead more
The main Differences between Fertiliser and Manure are as follows:
Fetilisers:
1. A fertiliser is an inorganic salt.
2. A fertiliser is prepared in factories.
3. A fertiliser does not provide any humus to the soil.
4. Fertilisers are very rich in plant nutrients like nitrogen, phosphorus and potassium.
Manures:
1.Manure is a natural substance obtained by the decomposition of cattle dung, human waste and plant residues.
2.Manure can be prepared in the fields.
3.Manure provides a lot of humus to the soil.
4.Manure is relatively less rich in plant nutrients.
(a) Preparation of soil The preparation of soil is the first step before growing a crop. One of the most important tasks in agriculture is to turn the soil and loosen it. This allows the roots to penetrate deep into the soil. The loosened soil helps in the growth of earthworms and microbes which areRead more
(a) Preparation of soil
The preparation of soil is the first step before growing a crop. One of the most important tasks in agriculture is to turn the soil and loosen it. This allows the roots to penetrate deep into the soil. The loosened soil helps in the growth of earthworms and microbes which are friends of the farmer and add humus to it. Also, turning and loosening of soil brings the nutrient-rich soil to the top so that plants can use these nutrients.
(b) Sowing
Sowing is the most important part of crop production. Before sowing, good quality seeds are selected. Good quality seeds are clean and healthy seeds of a good variety. Seeds can be sown by seed drill or manually.
(c) Weeding
Weeds are unwanted plants that grown along with crops and removal of weeds is known as weeding. Weeds can be removed either manually by using tools like khurpi or by using weedicides like 2, 4 – D. These are sprayed in the fields to kill the weeds.
(d) Threshing
The process of separation of the grains from the chaff is called threshing. This is carried out with the help of a machine called ‘combine’ which is in fact a combined harvester and thresher.
For growing a crop, sufficient sunlight and water and nutrients from the soil are essential. https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-1/
For growing a crop, sufficient sunlight and water and nutrients from the soil are essential.
The same kind of plants grown and cultivated on a large scale at a place is called crop. https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-1/
The same kind of plants grown and cultivated on a large scale at a place is called crop.
What are weeds? How can we control them?
The undesirable plants may grow naturally along with the crop are called weeds. There are many ways to remove weeds and control their growth. Weeds can be removed by uprooting or cutting them close to the ground, from time to time. This is done with the help of a khurpi. Weeds are also controlled byRead more
The undesirable plants may grow naturally along with the crop are called weeds. There are many ways to remove weeds and control their growth. Weeds can be removed by uprooting or cutting them close to the ground, from time to time. This is done with the help of a khurpi.
Weeds are also controlled by using certain chemicals, called weedicides, like 2, 4–D. These are sprayed in the fields to kill the weeds.
https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-1/
See lessExplain how soil gets affected by the continuous plantation of crops in a field.
Soil supplies mineral nutrients to the crop. These nutrients are essential for the growth of plants. Continuous growing of crops in the same field makes the soil poorer in certain nutrients. This makes the soil infertile. And then, to replenish the soil with nutrients farmers need to add manures toRead more
Soil supplies mineral nutrients to the crop. These nutrients are essential for the growth of plants. Continuous growing of crops in the same field makes the soil poorer in certain nutrients. This makes the soil infertile. And then, to replenish the soil with nutrients farmers need to add manures to the soil.
https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-1/
See lessIf wheat is sown in the kharif season, what would happen? Discuss.
Wheat is a rabi crop, hence it requires cold climatic conditions to be grown properly. If it is sown in the kharif season, it will not grow or may get destroyed due to excessive rains in the kharif season. https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-1/
Wheat is a rabi crop, hence it requires cold climatic conditions to be grown properly. If it is sown in the kharif season, it will not grow or may get destroyed due to excessive rains in the kharif season.
https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-1/
See lessWhat is irrigation? Describe two methods of irrigation which conserve water.
The supply of water to crops at different intervals is called irrigation. The two methods of irrigation which conserve water are as follows: (i) Sprinkler System: Under this method, the perpendicular pipes, having rotating nozzles on top, are joined to the main pipeline at regular intervals. When waRead more
The supply of water to crops at different intervals is called irrigation. The two methods of irrigation which conserve water are as follows:
(i) Sprinkler System:
Under this method, the perpendicular pipes, having rotating nozzles on top, are joined to the main pipeline at regular intervals. When water is allowed to flow through the main pipe under pressure with the help of a pump, it escapes from the rotating nozzles. It gets sprinkled on the crop as if it is raining.
(ii) Drip system:
In this system, the water falls drop by drop just at the position of the roots. It is the best technique for watering fruit plants, gardens and trees. Water is not wasted at all. It is a boon in regions where availability of water is poor.
https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-1/
See lessExplain how fertilisers are different from manure.
The main Differences between Fertiliser and Manure are as follows: Fetilisers: 1. A fertiliser is an inorganic salt. 2. A fertiliser is prepared in factories. 3. A fertiliser does not provide any humus to the soil. 4. Fertilisers are very rich in plant nutrients like nitrogen, phosphorus and potassiRead more
The main Differences between Fertiliser and Manure are as follows:
Fetilisers:
1. A fertiliser is an inorganic salt.
2. A fertiliser is prepared in factories.
3. A fertiliser does not provide any humus to the soil.
4. Fertilisers are very rich in plant nutrients like nitrogen, phosphorus and potassium.
Manures:
1.Manure is a natural substance obtained by the decomposition of cattle dung, human waste and plant residues.
2.Manure can be prepared in the fields.
3.Manure provides a lot of humus to the soil.
4.Manure is relatively less rich in plant nutrients.
https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-1/
See lessWrite a paragraph in your own words on each of the following: Preparation of soil, Sowing , Weeding , Threshing
(a) Preparation of soil The preparation of soil is the first step before growing a crop. One of the most important tasks in agriculture is to turn the soil and loosen it. This allows the roots to penetrate deep into the soil. The loosened soil helps in the growth of earthworms and microbes which areRead more
(a) Preparation of soil
The preparation of soil is the first step before growing a crop. One of the most important tasks in agriculture is to turn the soil and loosen it. This allows the roots to penetrate deep into the soil. The loosened soil helps in the growth of earthworms and microbes which are friends of the farmer and add humus to it. Also, turning and loosening of soil brings the nutrient-rich soil to the top so that plants can use these nutrients.
(b) Sowing
Sowing is the most important part of crop production. Before sowing, good quality seeds are selected. Good quality seeds are clean and healthy seeds of a good variety. Seeds can be sown by seed drill or manually.
(c) Weeding
Weeds are unwanted plants that grown along with crops and removal of weeds is known as weeding. Weeds can be removed either manually by using tools like khurpi or by using weedicides like 2, 4 – D. These are sprayed in the fields to kill the weeds.
(d) Threshing
The process of separation of the grains from the chaff is called threshing. This is carried out with the help of a machine called ‘combine’ which is in fact a combined harvester and thresher.
https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-1/
See lessFill in the blanks: For growing a crop, sufficient sunlight and _____________ and _____________ from the soil are essential.
For growing a crop, sufficient sunlight and water and nutrients from the soil are essential. https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-1/
For growing a crop, sufficient sunlight and water and nutrients from the soil are essential.
https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-1/
See lessFill in the blanks: Damaged seeds would _____________ on top of water.
Damaged seeds would float on top of water. https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-1/
Damaged seeds would float on top of water.
https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-1/
See lessFill in the blanks: The first step before growing crops is _____________ of the soil.
The first step before growing crops is preparation of the soil. https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-1/
The first step before growing crops is preparation of the soil.
https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-1/
See lessThe blanks: The same kind of plants grown and cultivated on a large scale at a place is called _____________.
The same kind of plants grown and cultivated on a large scale at a place is called crop. https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-1/
The same kind of plants grown and cultivated on a large scale at a place is called crop.
https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-1/
See less