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Ask QuestionPosted by Sneha Pradhani 6 years, 3 months ago
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Meghna Thapar 5 years, 10 months ago
Sodium metal is extracted by the electrolytic reduction of molten sodium chloride. When electric current is passed through molten sodium chloride, it decomposes to form sodium metal and chlorine gas.
2NaCl → 2Na(s) + Cl2(g)
At Cathode: Na+ + e- → Na
At Anode: 2Cl- → Cl2 + 2e-
Posted by Alwin Sony 6 years, 3 months ago
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Yogita Ingle 6 years, 3 months ago
It is the process of cutting down the trees. It is referred to as clearing of forests on a large scale to use the land for cultivation, building houses, factories, construction of dams or to obtain wood for making furniture and using it as fuel.
Causes of deforestation:
- Forests are cleared for accommodating expanding urban areas and for fulfilling their ever-increasing requirements.
- Forests are destroyed to clear land for crops and cattle grazing.
- Trees are cut down to be used for firewood.
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Yogita Ingle 6 years, 3 months ago
The process of making of food by green plants in the presence of sunlight and chlorophyll is known as photosynthesis. Photosynthesis is the combination of two words- Photo + Synthesis. ‘Photo’ means light and ‘Synthesis’ means to make.
Posted by Prarthana Bhowmick 6 years, 3 months ago
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Yogita Ingle 6 years, 3 months ago
If wheat is sown in the kharif season (from June to October), then the whole crop might get destroyed because of many factors such as lack of optimum temperature, adaptability, availability of pests, etc. Kharif season includes the rainy season, which is not favourable for the growth of wheat crop. Therefore, wheat crop should not be sowm during this season.
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Yogita Ingle 6 years, 3 months ago
Naphthalene balls used to repel moths and other insects are obtained from coal tar.
Posted by Kgraja Kgraja 6 years, 3 months ago
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Ripanjot Kaur 6 years, 3 months ago
Yogita Ingle 6 years, 3 months ago
| Prokaryotes | Eukaryotes | |
| Type of Cell | Always unicellular | Unicellular and multi-cellular |
| Cell size | Ranges in size from 0.2 μm – 2.0 μm in diameter | Size ranges from 10 μm – 100 μm in diameter |
| Cell wall | Usually present; chemically complex in nature | When present, chemically simple in nature |
| Nucleus | Absent | Present |
| Ribosomes | Present. Smaller in size and spherical in shape | Present. Comparatively larger in size and linear in shape |
| DNA arrangement | Circular | Linear |
| Mitochondria | Absent | Present |
| Cytoplasm | Present, but cell organelles absent | Present, cell organelles present |
| Endoplasmic reticulum | Absent | Present |
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Sanjukta Jena 6 years, 3 months ago
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Meghna Thapar 5 years, 10 months ago
Flame is a region where combustion or burning of a gaseous substance takes place. Only the solid or liquids which form gases when heated burn with a flame. Some of the substances which burn by producing flames are LPG, biogas, candle wax, camphor, magnesium and mustard oil.
Posted by Sahil Beck 6 years, 3 months ago
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Meghna Thapar 5 years, 6 months ago
1. Soil, topographic, and climatic requirements of the crop. Consistent with the rule know your crop first then select the farm, the first part in the planning stage before site selection is to learn everything about the crop to be grown. This involves a thorough identification of the environmental adaptation of the crop, particularly its soil, topographic, and climatic requirements.
2. Biotic factors and the prevalence of pests and diseases. Site selection may consider the natural population of certain organisms like bees and other pollinators. Where the agriculture venture involves the production of civet coffee or kape alamid, farmlands adjacent to forested areas may be preferred. But places with a long history of the presence of serious pests and diseases may be avoided. Likewise, caution should be exercised in choosing farm sites dominated by weeds which are difficult to eradicate.
3. Cost of acquisition or lease and in preparing the land. Where financial feasibility or affordability is a consideration, the cost of procuring or leasing the farmland is a limiting factor. This may take into consideration also the cost of modifying the physical features of the land such as in flattenning or modifying the landscape if so desired, the removal of barriers like unwanted trees, clumps, stumps and boulders, diversion of floodways, construction of drainage, roads and fire lanes; and in preparing the land for crop growing including the eradication of major weeds and disease-causing organisms, soil amendment, and provision of irrigation water.
4. Frequency of typhoon and other calamities. The frequency of typhoon and the possible occurence of other calamities like flood, drought and volcanic eruption are always considered in both location and site selection because they can cause severe loss in investment or total crop failure. In particular, some crops like banana are prone to injury due to strong winds.
5. Accessibility. A farm that is managed as a business must have access to supplies, equipment, and the market. It must be provided with infrastructures (e.g. roads) and, if the product is intended to be marketed elsewhere, shipping facilities or airports. Moreover, there is a general preference for farms in familiar locations and which are easily accessible to owner-managers.
6. Labor supply and cost. Skilled labor must be available at reasonable cost. Otherwise, laborers from other parts of the country may have to be imported.
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Meghna Thapar 5 years, 10 months ago
Genes are the functional units of chromosomes which transmit the heredity information from parents to offsprings. These are located on chromosomes.
The nucleus contains chromosomes, which are visible as rod-shaped structures only when the cell is about to divide. Chromosomes contain information for inheritance of features from parents to next generation in the form of DNA (Deoxyribo Nucleic Acid) molecules. Chromosomes are composed of DNA and protein. DNA molecules contain the information necessary for constructing and organising cells. Functional segments of DNA are called genes.
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Posted by Akash Deep 6 years, 3 months ago
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Meghna Thapar 5 years, 6 months ago
The friction force depends on two factors: a) The materials that are in contact. The two materials and the nature of their surfaces. Pushing the surfaces together causes the more of the asperities to come together and increases the surface area in contact with each other. When there is relative motion between two surfaces, there is a resistance to the motion. The frictional force is equal to the frictional coefficient times the normal force. Friction is caused due to attractive forces between the molecules near the surfaces of the objects.
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Diya Joshi 6 years, 3 months ago
3Thank You