Water passes through the plasma membrane both inwardly as well as outwardly. Net movement. Occurs along its concentration gradient, from the side of pure water or dilute solution (high water concentration) to cell side of concentrated solution (low water concentration). A cell placed in dilute solutRead more
Water passes through the plasma membrane both inwardly as well as outwardly. Net movement. Occurs along its concentration gradient, from the side of pure water or dilute solution (high water concentration) to cell side of concentrated solution (low water concentration). A cell placed in dilute solution (hypotonic solution) will show endosmosis because the external solution has higher concentration of water’ A cell placed in hypertonic solution (i.e., concentrated solution) will show exosmosis because cell sap has higher concentration of water.
(a) At present there is about 130 million hectares of degraded land in India as mentioned below: (i) Forest' degraded area – 28% (ii) Water eroded area – 56% (iii) Wind eroded area – 10% (iv) Saline and Alkaline land – 6% (b) Following factors/human factors are responsible for land degradation in InRead more
(a) At present there is about 130 million hectares of degraded land in India as mentioned below:
(i) Forest’ degraded area – 28%
(ii) Water eroded area – 56%
(iii) Wind eroded area – 10%
(iv) Saline and Alkaline land – 6%
(b) Following factors/human factors are responsible for land degradation in India:
(l) Mining: Mining sites are abandoned after excavation work is complete leaving deep scars and traces of over burdening. In states of Jharkhand, Chhattisgarh, Madhya Pradesh and
Orissa deforestation due to mining have caused severe land degradation.
(ii) Overgrazing: In states like Gujarat, Rajasthan, Madhya Pradesh and Maharashtra overgrazing is the main reason for land degradation.
(iii) Over-irrigation: In the states of Punjab, Haryana, Western Uttar Pradesh, over irrigation is responsible for land degradation due to water logging leading to increase in salinity and alkalinity in the soil.
(iv) The mineral processing like grinding of limestone for cement industry generate dust in the atmosphere. It retards the process of infiltration of water into soil after it settles down on the land. Thus industrial effluents as waste have become a major source of land and water pollution in many parts of the country.
What is crenation?
It is a wrinkled appearance of animal cells (e.g., human erythrocytes) placed in a hypertonic solution.
It is a wrinkled appearance of animal cells (e.g., human erythrocytes) placed in a hypertonic solution.
See lessPlasma mebrane is permeable to water. How does a cell show endosmosis or exosmosis?
Water passes through the plasma membrane both inwardly as well as outwardly. Net movement. Occurs along its concentration gradient, from the side of pure water or dilute solution (high water concentration) to cell side of concentrated solution (low water concentration). A cell placed in dilute solutRead more
Water passes through the plasma membrane both inwardly as well as outwardly. Net movement. Occurs along its concentration gradient, from the side of pure water or dilute solution (high water concentration) to cell side of concentrated solution (low water concentration). A cell placed in dilute solution (hypotonic solution) will show endosmosis because the external solution has higher concentration of water’ A cell placed in hypertonic solution (i.e., concentrated solution) will show exosmosis because cell sap has higher concentration of water.
See lessA drop of ink is placed gently at the base of a beaker containing water by means of a dropper. What will happen?
The ink slowly moves in all directions and ultimately makes the water uniformly coloured. This happens due to diffusion.
The ink slowly moves in all directions and ultimately makes the water uniformly coloured. This happens due to diffusion.
See lessWhich of the following states is not rich in minerals?
(a) Haryana
(a) Haryana
See lessExplain causes for land degradation.
(a) At present there is about 130 million hectares of degraded land in India as mentioned below: (i) Forest' degraded area – 28% (ii) Water eroded area – 56% (iii) Wind eroded area – 10% (iv) Saline and Alkaline land – 6% (b) Following factors/human factors are responsible for land degradation in InRead more
(a) At present there is about 130 million hectares of degraded land in India as mentioned below:
See less(i) Forest’ degraded area – 28%
(ii) Water eroded area – 56%
(iii) Wind eroded area – 10%
(iv) Saline and Alkaline land – 6%
(b) Following factors/human factors are responsible for land degradation in India:
(l) Mining: Mining sites are abandoned after excavation work is complete leaving deep scars and traces of over burdening. In states of Jharkhand, Chhattisgarh, Madhya Pradesh and
Orissa deforestation due to mining have caused severe land degradation.
(ii) Overgrazing: In states like Gujarat, Rajasthan, Madhya Pradesh and Maharashtra overgrazing is the main reason for land degradation.
(iii) Over-irrigation: In the states of Punjab, Haryana, Western Uttar Pradesh, over irrigation is responsible for land degradation due to water logging leading to increase in salinity and alkalinity in the soil.
(iv) The mineral processing like grinding of limestone for cement industry generate dust in the atmosphere. It retards the process of infiltration of water into soil after it settles down on the land. Thus industrial effluents as waste have become a major source of land and water pollution in many parts of the country.