Answer the following :
1.) Define diffusion and osmosis?
2.) Define isotonic, Hypotonic and Hypertonic solutions?
3.)Define cell wall and write it's functions?
4.)Define nucleus and write it's structure? (need full explanation)
claas-9th
ch-2
Cell-The basic unit of life
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Answers
1: Osmosis: Osmosis is the movement of solvent particles across a semipermeable membrane from a dilute solution into a concentrated solution. ...
Osmosis: Osmosis is the movement of solvent particles across a semipermeable membrane from a dilute solution into a concentrated solution. ... Diffusion: Diffusion is the movement of particles from an area of higher concentration to lower concentration. The overall effect is to equalize concentration throughout the medium.
2: hypotonic: Having a lower osmotic pressure than another; a cell in this environment causes water to enter the cell, causing it to swell
hypotonic: Having a lower osmotic pressure than another; a cell in this environment causes water to enter the cell, causing it to swell hypertonic: having a greater osmotic pressure than another.
hypotonic: Having a lower osmotic pressure than another; a cell in this environment causes water to enter the cell, causing it to swell hypertonic: having a greater osmotic pressure than another. isotonic: having the same osmotic pressure.
3: A cell wall is an outer layer surrounding certain cells that is outside of the cell membrane. ... The cell wall provides strength and structural support to the cell, and can control to some extent what types and concentrations of molecules enter and leave the cell
4: The cell nucleus is a membrane-bound structure that contains the cell's hereditary information and controls the cell's growth and reproduction. It is the command center of a eukaryotic cell and is commonly the most prominent organelle in a cell accounting for about 10 percent of the cell's volume.
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1)Osmosis: Osmosis is the movement of solvent particles across a semipermeable membrane from a dilute solution into a concentrated solution.
Diffusion: Diffusion is the movement of particles from an area of higher concentration to lower concentration. The overall effect is to equalize concentration throughout the medium
2)hypotonic: Having a lower osmotic pressure than another; a cell in this environment causes water to enter the cell, causing it to swell.
hypertonic: having a greater osmotic pressure than another. isotonic: having the same osmotic pressure.
3)A cell wall is an outer layer surrounding certain cells that is outside of the cell membrane. All cells have cell membranes, but generally only plants, fungi, algae, most bacteria, and archaea have cells with cell walls. The cell wall provides strength and structural support to the cell, and can control to some extent what types and concentrations of molecules enter and leave the cell. The materials that make up the cell wall differ depending on the type of organism. The cell wall has evolved many different times among different groups of organisms.
4)The cell nucleus is a membrane-bound structure that contains the cell’s hereditary information and controls the cell’s growth and reproduction.
It is the command center of a eukaryotic cell and is commonly the most prominent organelle in a cell accounting for about 10 percent of the cell’s volume.
In general, a eukaryotic cell has only one nucleus. However, some eukaryotic cells are enucleated cells (without a nucleus), for example, red blood cells (RBCs); whereas, some are multinucleate (consists of two or more nuclei), for example, slime molds.
The nucleus is separated from the rest of the cell or the cytoplasm by a nuclear membrane.
As the nucleus regulates the integrity of genes and gene expression, it is also referred to as the control center of a cell.