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Yogita Ingle 7 years, 4 months ago
The important nitrogen fixing bacteria are those belonging to the group known as rhizobium. ... Stands of such plants may be incorporated into the soil to enrich it with nitrogen for the purpose of supplying the needs of subsequent non-leguminous crops, a practice known as green manuring.
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Yogita Ingle 7 years, 4 months ago
Potatoes are healthy. It’s the additional salt, sauces and oil that makes them unhealthy. Plain oven baked potato is one of the healthiest foods you can eat. Boiled potatoes are good too but oven baked are better. Potatoes are rich in carbs, but they are way better and nutritious than rice. Boiled potatoes are also low in fat. 300 gm potatoes contain approximately 0.3 gm of fat and 5.6 gm of protein. Boiled potatoes are low in calories. They help you to lose those extra pounds if eaten properly.
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Meghna Thapar 5 years, 7 months ago
The visual symptoms of nitrogen deficiency mean that it can be relatively easy to detect in some plant species. Symptoms include poor plant growth, and leaves become pale green or yellow because they are unable to make sufficient chlorophyll. Leaves in this state are said to be chlorotic. About 78 per cent of the air is nitrogen gas. However, nitrogen is too unreactive to be used directly by plants to make protein. It must be converted into soluble ions, such as nitrates. Nitrogen-fixing bacteria in root nodules are able to do this.
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Yogita Ingle 7 years, 4 months ago
It is a small region with low mitotic activity in the centre of the root apex. The quiescent centre in the root meristem serves as a reserve for replenishment of damaged cells of the meristem.
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Taxonomy he branch of biology concerned with the classification of organisms into groups based on similarities of structure, origin, etc
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Yogita Ingle 7 years, 4 months ago
Quiescent Stage (Go): Cells which do not divide further, exit G1 phase to enter an inactive stage. This stage is called quiescent stage (Go) of the cell cycle. The cells in this stage remain metabolically active but do not undergo division. But these cells can resume division as and when required.
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Meghna Thapar 5 years, 7 months ago
The heart is roughly triangular in shape. It has four compartments called chambers inside it. The upper two chambers of the heart are called atria and the lower two chambers are called ventricles. The atria receive blood from the two main veins. The left atrium is connected to the left ventricle through a valve V1 and the right atrium is connected to the right ventricle through another valve V2. These valves prevent the backflow of blood into atria when the ventricles contract to pump blood out of the heart to the rest of the body because when the ventricles contract, the valves V1 and V2 close automatically so that the blood may not go back into the atria. The job of heart is to pump blood around our body. All the atria and ventricles of the heart contract and relax at appropriate times and make the heart behave like a pump. A sheath of tissue called pericardium protects the muscular heart.
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Meghna Thapar 5 years, 7 months ago
Polarization is the existence of opposite electrical charges on either side of a cell membrane (difference in inside a cell versus the outside of the cell).
Depolarization is the state which the cell membrane change from positive to negative charged outside the cell and from negative to positive charge inside the cell.
Repolarization is the state which the cell membrane change back to ist resting stage i.e from negative to positive charge outside the cell and from positive to negative charge inside the cell.
Posted by Nithish Nithi 7 years, 4 months ago
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Meghna Thapar 5 years, 7 months ago
- At the start of prophase I, the chromosomes have already duplicated. During prophase I, they coil and become shorter and thicker and visible under the light microscope.
- The duplicated homologous chromosomes pair, and crossing-over (the physical exchange of chromosome parts) occurs. Crossing-over is the process that can give rise to genetic recombination. At this point, each homologous chromosome pair is visible as a bivalent (tetrad), a tight grouping of two chromosomes, each consisting of two sister chromatids. The sites of crossing-over are seen as crisscrossed nonsister chromatids and are called chiasmata (singular: chiasma).
- The nucleolus disappears during prophase I.
- In the cytoplasm, the meiotic spindle, consisting of microtubules and other proteins, forms between the two pairs of centrioles as they migrate to opposite poles of the cell.
- The nuclear envelope disappears at the end of prophase I, allowing the spindle to enter the nucleus.
- Prophase I is the longest phase of meiosis, typically consuming 90% of the time for the two divisions.
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Yogita Ingle 7 years, 4 months ago
The diffusion of the content over a cell membrane by means of transport proteins. It is a passive movement of molecules across the cell membrane from the region of higher concentration to the region of lower concentration by means of a carrier molecule.
Dialysis: It is the diffusion of solutes across a selected permeable membrane. A selected permeable membrane is the one that allows specific content to pass through and other substances to pass slowly.
Osmosis: The movement of water molecules from the region of higher water concentration to the region of lower water concentration through a semipermeable membrane. It is the diffusion of the solvent across a selected permeable membrane. Since water is solvent in every living being, biologists define osmosis as the diffusion of water across a selected permeable membrane. For example, Plants take water and mineral from roots with the help of osmosis.
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