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Yogita Ingle 7 years, 6 months ago
Potassium ferrocyanide is used to determine the concentration of potassium permanganate, a compound often used in titrations based on redox reactions. Potassium ferrocyanide is used in a mixture with potassium ferricyanide and phosphate buffered solution (PBS) to provide a buffer for X-Gal, which is used to cleave Beta-galactosidase, giving a bright blue visualization where an antibody (or other molecule), conjugated to Beta-gal, has bonded to its target.
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Yogita Ingle 7 years, 5 months ago
Symbiosis or mutualism : Symbiosis is the combination of two Greek words ‘Sym’ means ‘with’ and ‘biosis’ means ‘living’, which means living together. In symbiosis or mutualism two different types of organisms live and work together for their mutual benefit from each other. They share shelter and nutrients, e.g. Lichens. Lichens are composite organisms composed of fungus and alga. Fungus is a saprophyte and alga is an autotroph. The Fungus supplies water and minerals to the cells of the alga while the alga supplies food; prepared by photosynthesis.
A bird sitting on the back of a rhino is an example of symbiosis. The bird gets worms to eat, while the rhino gets rid of those worms.
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Plants make their food by the process of photosynthesis, but animals cannot make their food themselves. Animals get their food from plants. Some animals eat plants directly while some animals eat plant eating animals. Thus, animals get their food from plants either directly or indirectly.
All organisms require food for survival and growth. Requirement of nutrients, mode of intake of food and its utilization in body are collectively known as nutrition.
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Yogita Ingle 7 years, 6 months ago
Waste management is the entire process from collection of waste from source till its disposal. This includes all processes like transportation, analysis, legal procedures, along with monitoring and enforcing regulations. There are a number principles related to waste management, but a generally accepted concept is one of the ‘Hierarchy of Waste Management’.
Posted by Madasi Sathwik 7 years, 6 months ago
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Yogita Ingle 7 years, 5 months ago
These are large plants where wastewater is cleaned before being sent to the nearest water bodies or being reused. The sewage treatment involves physical, chemical and biological processes to remove impurities from the wastewater.
Physical Process:
1. Filtration: The wastewater is passed through bar screen. Large objects; like rags, sticks, plastic bags, cans, etc. are removed in this process.
2. Grit and Sand Removal: The wastewater is slowly passed through the sedimentation tank. Grit, sand and pebbles settle down at the bottom.
3. Sedimentation: Water is then sent to the sedimentation tank. Solids; like faeces settle at the bottom. Floatable impurities; like oil and grease float on the surface. A scraper removes the faeces from the water. The impurity thus collected is called sludge; which is sent to the sludge tank. The sludge can be used to produce biogas or to produce manure. A skimmer removes the floatable impurities. Now, the water is called clarified water.
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Yogita Ingle 7 years, 6 months ago
Seed dispersal is the movement or transport of seeds away from the parent plant.
The seeds are dispersed by various ways:
(i) By winds: The light and hairy seeds of some plants are dispersed by winds. or example: grasses, seeds of aak (madar) and sunflower
(ii) By water: Some seeds are dispersed by water. These seeds and fruits have floating ability in the form of spongy or fibrous outer coat as in coconut.
(iii) By animals: Some seeds are dispersed by animals. Specially spiny seeds with hooks which get attached to the body of animals and are carried to distant places. For example: xanthium and urena.
(iv) By human: Human beings also help in the dispersal of seeds. They carry fruits to the long distances and throw their seeds there.
(v) Some seeds are dispersed when the fruits burst with sudden jerks. The seeds are scattered far from parental plant. For example: balsam and castor.
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