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Xylem transports water and minerals obtained from the soil.
Phloem transports products of photosynthesis from the leaves to other parts of the plant.
Vessels, tracheids of the roots, stems and leaves are connected to form a continuous system in xylem cells to transport water to all the parts of the plants.
Cells in the roots which are in contact with the soil take up ions which creates a difference of concentration between the roots and the soil and therefore water moves to the roots to eliminate the difference.
Water is moved into xylem of roots and from where it is pushed upward.
Plants use different mechanisms to pull water upwards through xylem like-
- Water which is lost through stomata is replaced by water absorbed by the roots.
- Evaporation of water from leaf creates a suction force which pulls water.
The loss of water in the form of water vapor is called
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Unlike stars that twinkle at night, planets do not. Instead they shine steadily due to the distance between these planets. Unlike stars that are so far away from earth that even in the most powerful of telescopes they look merely like dots or points and appear to twinkle due to “refraction” when they enter the earth’s atmosphere. But planets are much more closer to earth. Their appearance is that of tiny disks through telescopes. When the light from these planets enters the earth’s atmosphere they also go through refraction. But light from both the ends of the planet, travel away from each other in opposite direction, thus cancelling each other’s effects. So they appear steadily instead of twinkling like stars.
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It will be found to be equal to 6 cm. Thus, object is placed at a distance of 6 cm × 5 = 30 cm from the lens. An object 5.0 cm in length is placed at a distance of 20 cm in front of a convex mirror of radius of curvature 30 cm.
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Hormones are secreted in the body by several glands that are essential for the growth, development, reproduction, etc. They are the chemical substances which coordinate the activities of living organisms and also their growth. They are secreted by special tissues in our body through endocrine glands.
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When a solution of sodium hydrocarbonate is heated, sodium carbonate and water are formed with the evolution of carbon dioxide gas.
2NaHCO3−→−Heat Na2CO3 + H2O + CO2
Posted by Vikas Rathee123 5 years, 3 months ago
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- Features of Mendeleev’s Periodic Table:
- There are seven horizontal rows in the periodic table, numbered from 1 to 7. These seven rows are called periods.
- There are eight vertical columns numbered from I to VIII. These eight columns are called groups. Groups I to VII are further divided into sub groups A and B.
- The properties of elements in a particular period show regular gradation from left to right.
- Achievements of Mendeleev’s Periodic Table:
- Mendeleev kept some blank spaces in the periodic table for the elements which were yet to be discovered.
- He also predicted properties of some elements even before their discovery which were later found to be correct.
- Mendeleev’s periodic table could accommodate noble gases when they were discovered.
Posted by Yash Choudhary 5 years, 3 months ago
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Meghna Thapar 5 years, 3 months ago
Formic acid, systematically named methanoic acid, is the simplest carboxylic acid, and has the chemical formula HCOOH. It is an important intermediate in chemical synthesis and occurs naturally, most notably in some ants. Formic acid (HCO2H), also called methanoic acid, the simplest of the carboxylic acids, used in processing textiles and leather. The principal use of formic acid is as a preservative and antibacterial agent in livestock feed. When sprayed on fresh hay or other silage, it arrests certain decay processes and causes the feed to retain its nutritive value longer. Formic acid appears as a colorless liquid with a pungent odor.
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Meghna Thapar 5 years, 3 months ago
Electric potential, the amount of work needed to move a unit charge from a reference point to a specific point against an electric field. The potential difference (which is the same as voltage) is equal to the amount of current multiplied by the resistance. A potential difference of one Volt is equal to one Joule of energy being used by one Coulomb of charge when it flows between two points in a circuit. In any electric field there are two points of electric potential that are of significant interest to us. There's a point of high potential, where a positive charge would have the highest possible potential energy, and there's a point of low potential, where a charge would have the lowest possible potential energy.
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Yogita Ingle 5 years, 3 months ago
A soap molecule consists of two parts:
A long chain hydrocarbon tail. It is hydrophobic in nature.
Head: It is hydrophilic in nature.
When soap is added to an oily or greasy part of cloth, the hydrocarbon part of soap dissolves in oil, keeping the head away from the oil. Big molecules of oil and soap break by rubbing into small emulsified oil droplets in water, which are washed away by stream of water. The soap molecules which form micelles assist in dissolving the dirt in water, thus, we can wash our clothes.
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Meghna Thapar 5 years, 2 months ago
Ejaculation is a physiological process heavily controlled by the autonomic nervous system. It consists of two main phases: emission and expulsion. The main organs involved in ejaculation are the distal epididymis, the vas deferens, the seminal vesicle, the prostate, the prostatic urethra, and the bladder neck. Ejaculate contains fluid from the prostate, seminal vesicles, and bulbourethral glands. Though it contains a wide variety of substances, including citric acid, cholesterol, mucus, and water, its primary job is to deliver sperm.
Posted by Shivendu Raj 5 years, 3 months ago
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Yogita Ingle 5 years, 3 months ago
Resistance:
- The ratio of the potential difference between the two ends of a conductor to the current flowing through at uniform temperature is called resistance of that conductor.
- The unit of resistance is ohm (Ω).
- Resistance of conductor depends on its length, temperature, cross section area, material of the conductor.
- Resistance is related with a particular conductor.
Resistivity:
- At a fixed temperature amount of resistance offered in the flow of current by a conductor having unit length and unit cross section is called its resistivity or specific resistance.
- The unit of resistivity is ohm-meter (Ω-m).
- resistivity of conductor depends on the material of the conductor and its temperature.
- Resistivity is related with the material of the conductor.
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