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Analogous organs have different basic structure but perform same function. Ex.wing of bat and wing of a bird.
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Yogita Ingle 6 years, 1 month ago
Coke is obtained by destructive distillation of charcoal or coal in the furnace Destructive distillation is the chemical process involving the decomposition of coal or charcoal by heating to a high temperature in the absence of air or in the presence of limited amounts of oxygen.
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Yogita Ingle 6 years, 1 month ago
Efflorescence is the loss of water (or a solvent) of crystallization from a hydrated or solvated salt to the atmosphere on exposure to air.
Efflorescence means "to flower out" in French is the migration of a salt to the surface of a porous material, where it forms a coating. The essential process comprises the dissolving of an internally held salt in water, or occasionally in another solvent. The water, with the salt now held in solution, migrates to the surface, then evaporates, leaving a coating of the salt.
Example is Gypsum (CaSO4.2H2O) is a hydrate solid that, in a sufficiently dry environment, will give up its water to the gas phase and forms anhydrite (CaSO4).
Posted by Harshdeep Singh 6 years, 1 month ago
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Yogita Ingle 6 years, 1 month ago
Root pressure is caused by active transport of mineral nutrient ions into the root xylem. Without transpiration to carry the ions up the stem, they accumulate in the root xylem and lower the water potential. Water then diffuses from the soil into the root xylem due to osmosis. Root pressure is caused by this accumulation of water in the xylem pushing on the rigid cells. Root pressure provides a force, which pushes water up the stem, but it is not enough to account for the movement of water to leaves at the top of the tallest trees.
Transpirational pull is the main phenomenon driving the flow of water in the xylem tissues of large plants.Transpirational pull results ultimately from the evaporation of water from the surfaces of cells in the interior of the leaves. This evaporation causes the surface of the water to pull back into the pores of the cell wall. Inside the pores, the water forms a concave meniscus. The high surface tension of water pulls the concavity outwards, generating enough force to lift water as high as a hundred meters from ground level to a tree's highest branches. Transpirational pull only works because the vessels transporting the water are very small in diameter, otherwise cavitation would break the water column.
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The presence of the Coliform bacteria in the water proves that there was a mixture of the feces and sewage with the water.
So the water is contaminated with the feces of humans or animals. Coliform bacteria cause diseases which are carried by the water and causes illness.
Escherichia coli is the subgroup of the Coliform bacteria. These types of bacteria can be found at the intestine of the human and the warm-blooded animals.
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Yogita Ingle 6 years, 1 month ago
- Amoeba is a unicellular , omnivore organism that does not possess specialised organ for the process of nutrition .
- The mode of nutrition in Amoeba is HOLOZOIC and takes place with the help of pseudopodia ( finger like structure ) .
- It engulfs food when it comes in contact with its cell surface by ingestion .
- Pseudopodia fuses over food particle to form food vacuole .
- Digestion in Ameoba is INTRACELLULAR in nature. Inside the food vacuole, complex food breaks into small soluble molecules , This process is called ABSORPTION .
- The absorbed food is further ASSIMILATED by Amoeba to derive energy for growth.
- The undigested food material is removed by the cell membrane, which ruptures suddenly at any place and eliminates out the undigested food.
- The process of throwing out undigested food is called EGESTION .
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When electric current flows through a solenoid, magnetic field is set up around the solenoid. The pattern of the magnetic field is same as that of magnetic field of a bar magnet. One end of the solenoid behaves as north pole and the other end of the solenoid behaves as south pole.
To determine the north and south pole of a current carrying solenoid with the help of a
bar magnet, suspend it with a strong thread. Now bring the north pole of a bar magnet towards one end of the solenoid. If the solenoid attracts towards the magnet, then that face of the solenoid is south pole. If the bar magnet moves away from the solenoid, then that face of the solenoid is the north pole.
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Apoorv Goel 6 years, 1 month ago
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