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Yogita Ingle 5 years, 6 months ago
If the medium surrounding the cell has a higher water concentration than the cell, i.e., if the solution is very dilute solution, then the cell will gain water by osmosis. Such dilute solution is called Hypotonic solution.
Posted by Kundan Kumar 5 years, 6 months ago
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Yogita Ingle 5 years, 6 months ago
km/hr = 1 km/1 hr = 1 × 1000 m/60 × 60 sec = 1000/3600 m/sec = 5/18 m/sec
So, we say that to convert km/hr into m/sec, we multiply by 5/18.
40× 5/18 = 11.11 m/s
Posted by Surekha Anchan 5 years, 6 months ago
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Yogita Ingle 5 years, 6 months ago
|
Cell Membrane |
Plasma Membrane |
|
It surrounds the entire components of the cell. |
It surrounds only the cell organelles. |
|
It regulates the tonicity of the cell. |
It does not regulate the tonicity of the cell. |
| Cell membrane can be transformed to stimulate movement and feeding in organisms such as Paramaecium. |
Plasma membrane cannot be modified. |
|
It contains initial receptors for signal transduction and is the first step in cell signalling. |
It is not the first step in cell signalling. However, it is involved in the process. |
| Always protects the cell from bacteria and viruses. |
Does not always protect the cell from outside invaders. |
|
Plays an important role in cytokinesis during cell division. |
Do not play a key role in cytokinesis during cell division. |
| Cilia are present and are involved in feeding and movement. |
Cilia are absent. |
|
Is a target for antimicrobials. |
Is not a target for antimicrobials. |
Posted by Lakshya Gupta 5 years, 6 months ago
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Yogita Ingle 5 years, 6 months ago
The primary function of the plasma membrane is to protect the cell from its surrounding. composed of a phospholipid bilayer with embedded proteins, the plasma membrane is selectively permeable to ions and organic molecules and regulates the movement of substances in and out of cells.
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Aniket Raj 5 years, 6 months ago
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Yogita Ingle 5 years, 6 months ago
Endoplasmic reticulum
- The large network of membranous sheets and tubes is called endoplasmic reticulum.
- They are filled with fluids and carries materials throughout the cell due to which it is also called transport system of the cell.
- It transports materials between the regions of cytoplasm or between the cytoplasm and nucleus.
- It also provides a surface for some biochemical activities of cell.
- It can be classified into two types:
- RER (Rough Endoplasmic Reticulum)
- SER (Smooth Endoplasmic Reticulum)
Posted by Harsh Kumar 5 years, 6 months ago
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Meghna Thapar 5 years, 6 months ago
Brownian motion is caused by the random buffeting of small particles by atoms and molecules which are constantly moving. The particles must be small enough to move by brownian motion. Brownian motion, also called Brownian movement, any of various physical phenomena in which some quantity is constantly undergoing small, random fluctuations. It was named for the Scottish botanist Robert Brown, the first to study such fluctuations (1827).
Meghna Thapar 5 years, 6 months ago
Brownian motion, also called Brownian movement, any of various physical phenomena in which some quantity is constantly undergoing small, random fluctuations. It was named for the Scottish botanist Robert Brown, the first to study such fluctuations (1827). Brownian motion is caused by the random buffeting of small particles by atoms and molecules which are constantly moving. The particles must be small enough to move by brownian motion.
Meghna Thapar 5 years, 6 months ago
Brownian motion, also called Brownian movement, any of various physical phenomena in which some quantity is constantly undergoing small, random fluctuations. It was named for the Scottish botanist Robert Brown, the first to study such fluctuations (1827).
Posted by Hanshika Rawat 5 years, 6 months ago
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Posted by Sidh Kataria 5 years, 6 months ago
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Meghna Thapar 5 years, 6 months ago
The smallest cell is the sperm cell and the largest cell is ovum in the human body. The sperm is a male reproductive cell and they are small in size. The sperm cell head measures about 4 mm in length, just slightly smaller than a red blood cell. The ovum also called egg cell is the reproductive cell in the female body.
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Yogita Ingle 5 years, 6 months ago
When you apply brakes on a car the velocity is in forward direction but acceleration is in backward direction, so acceleration will be negative. It is also called deceleration.
Jayati Thukral 5 years, 6 months ago
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Meghna Thapar 5 years, 5 months ago
Root is a part of a plant which is in the soil. The roots of a plant perform many functions. They are as follows:
- It anchors the plant to the soil.
- It absorbs water and minerals from the soil.
- It helps in holding the soil together.
Types of root:
- Tap roots: They are straight tapering roots which grow vertically down into the soil and gives branches on all the sides. Tap root is the thick main root having thin and small, side roots called lateral roots. Examples – pea plant, neem tree, mango tree, carrot, radish, tulsi, etc.
- Fibrous roots: The bunches of smaller roots are called fibrous roots. They are fibre-like roots of similar size. They spread out in the soil to give a firm support.
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Ritik Varshney 5 years, 6 months ago
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