Effects of using manures on soil quality: The manures enrich the soil with nutrients. They provide a lot of organic matter (humus) to the soil and thus restores water retention capacity of sandy soils and drainage in clayey soil. The addition of manures reduces soil erosion. They provide food for sRead more
Effects of using manures on soil quality:
The manures enrich the soil with nutrients.
They provide a lot of organic matter (humus) to the soil and thus restores water retention capacity of sandy soils and drainage in clayey soil.
The addition of manures reduces soil erosion.
They provide food for soil organisms, like soil friendly bacteria.
Effects of using fertilizers on soil quality:
By the continuous use of fertilizers, the soil becomes powdery, dry and rate of soil erosion increases.
By the use of fertilizers, the organic matter decreases which further decreases the porosity of soil and the plant roots do not get oxygen properly,
Plants get nutrients from air, water and soil. There are, sixteen nutrients essential for the growth of plants. Carbon and Oxygen are supplied by water. The remaining thirteen nutrients are supplied by soil.
Plants get nutrients from air, water and soil. There are, sixteen nutrients essential for the growth of plants. Carbon and Oxygen are supplied by water. The remaining thirteen nutrients are supplied by soil.
Macro-nutrients are the essential elements which are utilised by plants in large quantities. Many macro-nutrients are required by the plants for the following functions: As the constituent of protoplasm N, P, S are present in proteins Ca is present in cell wall Mg is important constituent of chloropRead more
Macro-nutrients are the essential elements which are utilised by plants in large quantities. Many macro-nutrients are required by the plants for the following functions:
Factors responsible for loss of grains, during storage and production are: (a) Biotic factors like rodents, pests, insects, etc. (b) Abiotic factors like temperature, humidity, moisture, etc. Combination of both biotic and abiotic factors causes : infestation of insects weight loss poor germinationRead more
Factors responsible for loss of grains, during storage and production are:
(a) Biotic factors like rodents, pests, insects, etc.
(b) Abiotic factors like temperature, humidity, moisture, etc.
Combination of both biotic and abiotic factors causes :
1. Take a cup of water in a container as solvent and heat it. 2. Add sugar in it which is solute. Heat it till all sugar dissolves. 3. You get a solution of water and sugar. 4. Sugar is soluble in water completely. 5. Add half a tea-spoon of tea-leaves, it is insoluble in water. 6. Boil the content,Read more
1. Take a cup of water in a container as solvent and heat it.
2. Add sugar in it which is solute. Heat it till all sugar dissolves.
3. You get a solution of water and sugar.
4. Sugar is soluble in water completely.
5. Add half a tea-spoon of tea-leaves, it is insoluble in water.
6. Boil the content, add milk which is also soluble in water, boil again.
7. Filter the tea with the help of strainer, the tea collected in cup is filtrate and the tea leaves collected on the strainer is residue.
(a) Saturated solution: In a given solvent when no more solute can dissolve further at a given temperature is called saturated solution. (b) Pure substance: A pure substance consists of a single type of particles. E.g., gold, silver. (c) Colloid: A colloid is a solution in which the size of solute pRead more
(a) Saturated solution: In a given solvent when no more solute can dissolve further at a given temperature is called saturated solution. (b) Pure substance: A pure substance consists of a single type of particles. E.g., gold, silver. (c) Colloid: A colloid is a solution in which the size of solute particles are bigger than that of true solution. These particles cannot be seen with our naked eyes, they are stable, e.g., ink, blood. (d) Suspension: It is a heterogeneous mixture in which the solute particles are big enough to settle down, e.g., chalk-water, paints, etc.
Compare the use of manure and fertilizers in maintaining soil fertility.
Effects of using manures on soil quality: The manures enrich the soil with nutrients. They provide a lot of organic matter (humus) to the soil and thus restores water retention capacity of sandy soils and drainage in clayey soil. The addition of manures reduces soil erosion. They provide food for sRead more
Effects of using manures on soil quality:
Effects of using fertilizers on soil quality:
- By the continuous use of fertilizers, the soil becomes powdery, dry and rate of soil erosion increases.
- By the use of fertilizers, the organic matter decreases which further decreases the porosity of soil and the plant roots do not get oxygen properly,
- The nature of soil changes to acidic or basic.
See lessHow do plants get nutrients?
Plants get nutrients from air, water and soil. There are, sixteen nutrients essential for the growth of plants. Carbon and Oxygen are supplied by water. The remaining thirteen nutrients are supplied by soil.
Plants get nutrients from air, water and soil. There are, sixteen nutrients essential for the growth of plants. Carbon and Oxygen are supplied by water. The remaining thirteen nutrients are supplied by soil.
See lessWhat are macro-nutrients and why are they called macronutrients?
Macro-nutrients are the essential elements which are utilised by plants in large quantities. Many macro-nutrients are required by the plants for the following functions: As the constituent of protoplasm N, P, S are present in proteins Ca is present in cell wall Mg is important constituent of chloropRead more
Macro-nutrients are the essential elements which are utilised by plants in large quantities. Many macro-nutrients are required by the plants for the following functions:
- As the constituent of protoplasm
- N, P, S are present in proteins
- Ca is present in cell wall
- Mg is important constituent of chlorophyll
See lessHow do biotic and abiotic factors affect crop production?
Factors responsible for loss of grains, during storage and production are: (a) Biotic factors like rodents, pests, insects, etc. (b) Abiotic factors like temperature, humidity, moisture, etc. Combination of both biotic and abiotic factors causes : infestation of insects weight loss poor germinationRead more
Factors responsible for loss of grains, during storage and production are:
(a) Biotic factors like rodents, pests, insects, etc.
(b) Abiotic factors like temperature, humidity, moisture, etc.
Combination of both biotic and abiotic factors causes :
- infestation of insects
- weight loss
- poor germination ability
- degradation in quality
- discolouration
- poor market price
See lessWhat do we get from cereals, pulses, fruits and vegetables?
Cereals give carbohydrates which provide energy. Pulses give proteins which build our body. Vegetables and fruits provide vitamins and minerals.
Cereals give carbohydrates which provide energy.
See lessPulses give proteins which build our body.
Vegetables and fruits provide vitamins and minerals.
Which separation techniques will you apply for the separation of Iron pins from sand.
Magnetic separation
Magnetic separation
See lessWhich separation techniques will you apply for the separation of Tea leaves from tea.
Filtration
Filtration
See lessWrite the steps you would use for making tea. Use the words solution, solvent, solute, dissolve, soluble, insoluble, filtrate and residue.
1. Take a cup of water in a container as solvent and heat it. 2. Add sugar in it which is solute. Heat it till all sugar dissolves. 3. You get a solution of water and sugar. 4. Sugar is soluble in water completely. 5. Add half a tea-spoon of tea-leaves, it is insoluble in water. 6. Boil the content,Read more
1. Take a cup of water in a container as solvent and heat it.
See less2. Add sugar in it which is solute. Heat it till all sugar dissolves.
3. You get a solution of water and sugar.
4. Sugar is soluble in water completely.
5. Add half a tea-spoon of tea-leaves, it is insoluble in water.
6. Boil the content, add milk which is also soluble in water, boil again.
7. Filter the tea with the help of strainer, the tea collected in cup is filtrate and the tea leaves collected on the strainer is residue.
Explain the following giving examples. (a) saturated solution (b) pure substance (c) colloid (d) suspension.
(a) Saturated solution: In a given solvent when no more solute can dissolve further at a given temperature is called saturated solution. (b) Pure substance: A pure substance consists of a single type of particles. E.g., gold, silver. (c) Colloid: A colloid is a solution in which the size of solute pRead more
(a) Saturated solution: In a given solvent when no more solute can dissolve further at a given temperature is called saturated solution.
See less(b) Pure substance: A pure substance consists of a single type of particles. E.g., gold, silver.
(c) Colloid: A colloid is a solution in which the size of solute particles are bigger than that of true solution. These particles cannot be seen with our naked eyes, they are stable, e.g., ink, blood.
(d) Suspension: It is a heterogeneous mixture in which the solute particles are big enough to settle down, e.g., chalk-water, paints, etc.
Classify each of the following as a homogeneous or heterogeneous mixture. soda water, wood, air, soil, vinegar, filtered tea.
Homogeneous: Soda water, vinegar, filtered tea. Heterogeneous: Wood, air, soil.
Homogeneous: Soda water, vinegar, filtered tea.
See lessHeterogeneous: Wood, air, soil.