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Yogita Ingle 6 years, 5 months ago
The main function of flowers is to produce fruits and seeds.
Talha Ali 6 years, 5 months ago
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Heterogeneous Mixtures: A Heterogeneous mixtures does not have a uniform composition throughout its mass also it has visible boundaries of separation between various components. For example mixture of sand and water.
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- It has a uniform composition
- It can’t be separated out physically
- ‘homo’ means the same
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Nectar: Sweet juices found in flowers are known as nectar.
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The oxygen in the atmosphere is replaced by the plants. During the process of photosynthesis, plants take in CO2 and release oxygen.
Oxygen is replaced in the atmosphere by the plants as they prepare food (photosynthesis).
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Meghna Thapar 6 years ago
A fertilizer is a salt or an organic compound containing the necessary plant nutrients like nitrogen, phosphorous or potassium, to make the soil more fertile. These have plant nutrients in concentrated form so they provide quick replenishment of plant nutrients in the soil and restore its fertility. The use of fertilisers has helped the farmers to get better yield of crops such as wheat, paddy, rice, etc.
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Vitamin B1
The deficiency of Vitamin B1 in food causes a disease called as beri-beri.
The muscles of the person become very weak and he has very little energy to do work.
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Earth's magnetic field is a magnetic dipole, similar to that of a bar magnet tilted 11° from the earth's axis of rotation. The magnetic south pole is near the geographic south pole, and the magnetic north pole is near the geographic north pole. The earth's magnetic field, extending tens of thousands of kilometers into space, is called the magnetosphere (actually, like all magnetic fields, the earth's field extends infinitely into space, but is much weaker farther away). The magnetosphere protects the earth from solar wind, which is a stream of charged particles ejected from the sun. Although not fully understood, the earth's magnetic field is caused by the dynamo effect. The direction of the earth's magnetic field can also reverse direction.
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Salt is soluble in water whereas sand is insoluble in water. This difference in solubilities of salt and sand in water is used to separate them.
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Natural fibers: The fibers which are obtained from plants and animals are called natural fibers. Examples: cotton, jute, silk, wool.
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Yogita Ingle 6 years, 5 months ago
A change which cannot happen backward, that is, it cannot be reversed is called an irreversible change. When you burn a piece of paper, it turns to ash. It cannot become paper again. Your height cannot decrease. These are irreversible changes. They cannot be reversed at all.
All complex natural processes are irreversible. The phenomenon of irreversibility results from the fact that if a thermodynamic system, which is any system of sufficient complexity, of interacting molecules is brought from one thermodynamic state to another, the configuration or arrangement of the atoms and molecules in the system will change in a way that is not easily predictable. Some "transformation energy" will be used as the molecules of the "working body" do work on each other when they change from one state to another. During this transformation, there will be some heat energy loss or dissipation due to intermolecular friction and collisions. This energy will not be recoverable if the process is reversed.
The following is a list of spontaneous events which contribute to the irreversibility of processes.
• Heat transfer through a finite temperature difference
• Friction
• Plastic deformation
• Flow of electric current through a resistance
• Magnetization or polarization with a hysteresis
• Unrestrained expansion of fluids
• Spontaneous chemical reactions
• Spontaneous mixing of matter of varying composition/states
Examples of the irreversible reactions that take place in nature:
1) Photosynthesis
12H2O + 6CO2→ C6H12O6 + 6O2 + 6H2O
2) Biodegradation of matter
3) Cellular respiration
C6H12O6 + 6O2 → 6CO2 + 6H2O + energy
4) Germination of seeds.
5) Flowering of bud.
6) Bio gas production from cow dung.
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