Bio Chapter 4

Front 1

Imbibition

Back 1

The phenomenon by which the living or dead plant cells absorb water by surface attraction.

Front 2

Diffusion

Back 2

The free movement of molecules of a substance from the region of higher concentration to the region of lower concentration when the two are in direct contact.

Front 3

Osmosis

Back 3

The movement of water molecules from their region of higher concentration to the region of their lower concentration through a semi permeable membrane.

Front 4

Endomosis

Back 4

The inward diffusion of water through a semi permeable membrane when the surrounding solution is less concentrated .This tends to swell up the cell.

Front 5

Exomosis

Back 5

The outward diffusion of water through a semi permeable membrane when the surrounding solution is more concentrated.This tends to shrink the cell.

Front 6

Osmotic Pressure

Back 6

Osmotic Pressure of a solution is its tendency to take in water by osmosis.

Front 7

Tonocity

Back 7

The relative concentration of a solution that determines the direction and extent of diffusion.

Front 8

Isotonic

Back 8

The relative concentration of water molecules on either side of the cell membrane is same.

Front 9

Hypotonic

Back 9

The solution outside the cell has a lower concentration than the fluids inside the cell.

Front 10

Hypertonic

Back 10

The solution outside the cell has a higher concentration than the fluids inside the cell.

Front 11

Active Transport

Back 11

The passage of a substance from its lower to higher concentration through a living cell membrane using energy from the cell

Front 12

Turgidity

Back 12

A condition in which the cell cannot accommodate any more water.

Front 13

Turgor Pressure

Back 13

The pressure of the cell contents on the cell wall.

Front 14

Plasmolsis

Back 14

The contraction of cytoplasm from the cell wall caused due to the withdrawal of water when placed in a strong hipertonic solution.

Front 15

Flaccidity

Back 15

The condition in which the cell content is shrunken and the cell is no more tight.

Front 16

Guttation

Back 16

Loss of excessive water.