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Yogita Ingle 7 years, 6 months ago
Meristematic cells divide frequently and give rise to new cells and hence they need dense cytoplasm and thin cell wall. Vacuoles causes hindrance in cell division as it is full of cell sap to provide turgidity and rigidity to the cell. Also vacuoles basically serve the purpose of storing of nutrients, excess salts etc. Meristematic cells do not need to store these nutrients as they have compact shape.
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Yogita Ingle 7 years, 6 months ago
Kepler’s three laws of planetary motion are:
• The law of orbits
• The law of areas and
• The law of periods
Kepler’s first law
Kepler’s first law, the law of orbits, states that the orbit of a planet is an ellipse with the sun at one of the foci. An ellipse is a closed, curved shape that is defined by two points called foci representing an elongated circle.The closest point on a planet’s orbit from the sun is called perihelion and the farthest point from the sun is called the aphelion.
Kepler’s second law
Kepler’s second law of planetary motion, also known as the law of areas, states that the line joining the planet to the sun sweeps out equal areas in equal intervals of time as the planet <a href="https://www.nextgurukul.in/wiki/concept/CBSE/VIII/Science/Solar-System.htm" target="_blank"> </a> travels in its orbit.
Kepler’s third law
Kepler’s third law, the law of periods, defines the relationship between the orbital period of a planet and the average radius of its orbit. The orbital period of a planet, denoted by T, is the time taken by the planet to make a complete revolution around the sun along its orbit.
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Yogita Ingle 7 years, 6 months ago
The International System of Units is a scientific method of expressing the magnitudes or quantities of important natural phenomena. All SI units can be expressed in terms of standard multiple or fractional quantities, as well as directly.
The meter (m) is the SI unit of displacement or length.
The kilogram (kg) is the SI unit of mass.
The second (s or sec) is the SI unit of time.
The kelvin (K), also called the degree Kelvin (abbreviation, o K), is the SI unit of temperature.
The amper (A) is the SI unit of electric current.
The candela (cd) is the SI unit of luminous intensity.
The mole (mol) is the SI unit of material quantity.
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The cells of smooth muscles are spindle shaped and each has one nucleus. Smooth muscle is found in those organs where involuntary movement is possible, e.g. alimentary canal.
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Yogita Ingle 7 years, 6 months ago
Balanced Forces: If the resultant of applied forces is equal to zero, it is called balanced forces. Example: In the tug of war if both the teams apply similar magnitude of forces in opposite directions, rope does not move in either side. This happens because of balanced forces in which resultant of applied forces become zero
Unbalanced Forces: If the resultant of applied forces are greater than zero the forces are called unbalanced forces. An object in rest can be moved because of applying balanced forces.
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Yogita Ingle 7 years, 6 months ago
Animal organs are made up of four basic types of tissues
1.epithelial tissue
2. connective tissue
3. muscle tissue
4. nerve tissue.
These tissues have distinctive features and specific functions which combine to form functioning organs.
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Yogita Ingle 7 years, 6 months ago
A proton is a subatomic particle with a positive electric charge. Protons are found in the nucleus of every atom. The mass of a proton is extremely small when put in human sized units. The mass of one proton is 1.67 x 10-27 kg.
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Anubhav Rai 7 years, 6 months ago
1Thank You