Plant Water R/S Flashcards
Vascular tissue in plants develop from sporo or gametophyte body
Sporophytic body
What is seed
Embryo with nutrients
From direct Elongation of radical gives rise to
Primary root
Types of root in monocot and dicot
Mono- fibrous
Di- tap root
Characteristics of water
High dielectric constant
High heat of vaporization
High specific heat
Electrically neutral polar solvents
Cohesion (due to high hydrogen bonding)
Diffusion depends on
Conc
Size of molecules
Temp
Conc for diffusion given by
Ficks formula
J=-D(∆C÷∆x)
D diffusion constant
C diff in conc
J flux per unit area
- sign= moves to lower conc
Osmotic pressure
Pressure req to stop entry of water from semipermeable membrane on osmatically active environment
Proportional to diff in conc
Tonicity and types
Measure osmotic pressure gradient of 2 solution
Hypo. Turgid
Hyper flaccid
Iso. Normal
Turgor pressure
When cell becomes turgid the pressure it applies on wall is turgor pressure
Wall applies equal oppo pressure - wall pressure
Plasmolysis
Shrinking of protoplast away from cell wall
Turgor pressue 0
What is water potential and water potential of pure and impure sample
Water potential is potential energy of water
Pure water- more pure- 0 water potential
Impure water- solutes - -ve water potential
Use of water potential
Used to describe movement of water
Water moves from higher to lower water potential
Components of water potential
Water potential=
gravitation potential+ pressure potential+ solute potential+ matric potential
Solute potential/osmotic potential (like water potential)
Pressure potential/hydrostatic pressure(proportional to water potential)
High pressure (than atm) water potential high
+ Pressure high water potential
+= Turgid
- when xylem under tension
Gravitation and Matrix usually omitted
Mass flow
- Method of long distance transportation
- It is pressure driven (difd in pressure)
- Pressure can be + or -
