Tag: bio-chemistry
Questions Related to bio-chemistry
The cell becomes turgid in solution which is
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Hypertonic
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Isotonic
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Hypotonic
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None of the above
Water will enter a cell, if it is placed in solution less concentrated than cell sap due to
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Endosmosis
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Diffusion
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Imbibition
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Plasmolysis
(A) Endosmosis is the movement of solution from outside of the cell to inside the cell.
Glucose is not stored in plants due to its ability to
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Decrease osmotic pressure
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Increase osmotic pressure
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Increase turgor pressure
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Decrease turgor pressure
- Osmosis occurs only through the semi-permeable membrane. Osmosis is a gradient dependent process, osmosis is different from diffusion as it is characterized by a semi-permeable membrane.
- Net direction and rate of osmosis depend on both pressure gradient and concentration gradient.
The space between plasma membrane and cell wall of a plasmolysed cell surrounded by a hypertonic solution is occupied by
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Isotonic solution
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Hypotonic solution
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Hypertonic solution
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Water
The hypertonic solution involves the movement of a solute particle from low concentration to high concentration. The water will move from a higher concentration to a lower concentration. The cell will swell up.
2% NaCl as compared to 18% glucose solution is
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Isoosmotic
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Hypoosmotic
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Hyperosmotic
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None of the above
Osmotic pressure of pure water is
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0
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1
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10
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100
Osmotic pressure is generated when solutes are added to water. It depends on the concentration of a solution.
Choose the wrong statement.
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Cells swell in hypertonic solutions and shrink in hypotonic solutions.
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Water potential is the kinetic energy of water which helps in movement of water.
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Absorption of water by seeds and dry wood takes place by special type of diffusion called imbibition.
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$ \Psi _s $ is always negative.
The solute potential is always negative as it reduces osmotic pressure.
Osmotic pressure of a cell kept in water is chiefly regulated by
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Vacuoles
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Plastids
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Ribosomes
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Mitochondria
Vacuoles are the organelles that store all the extra water and salts that are the basis of creating osmotic pressure in the cell. The vacuole takes up a huge central place in the cell. The solution outside the cell is hypertonic, hypotonic or isotonic with respect to the contents inside the vacuole. Plastids are the centres for photosynthesis, Ribosomes are small granule-like structures that help in protein synthesis whereas mitochondria generate energy for the cell by utilising sugars.
RBC placed in distilled water will
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Burst
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Shrink
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Stick to one another
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Divide
RBCs placed in distilled water will burst because distilled water is extremely hypotonic to the cytoplasm of the cell. This will involve the intake of enormous amounts of water and the cells will burst.
Flaccid cell means
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Cell with turgidity
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Plasmolysed cell
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The cell in which water flows in and out of cell are in equilibrium
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The cell kept in hypotonic solution
When a cell is placed in an hypertonic solution water is transported out of the cell and the cell shrinks or shrivels or plasmolysed. On contrary when the cell is placed in hypotonic solution the water flows into the cell causing the cells to swell and finally leading to their lysis. However, when the cells are placed in isotonic solutions there will be continuous flow of water in and out of the cell and the cell is said to be in flaccid condition. Thus, the correct option of C.