plant physio Flashcards
(15 cards)
imbibition
It is the process by which the living or dead plants absorb water by surface attraction
osmotic pressure
It is the minimum pressure that must be exerted to prevent the passage of PURE solvent into the solution when the two are separated by a semi permeable membrane
precaution in ganong’s potometer(2)
- water tight
- twig should be cut under water and obliquely
limitation of ganongs potometer(3)
- Introducing bubble is not very easy
- twig may not remain fully alive for a long time
- changes in outside air temperature may affect the position of air bubble
external factors affecting transpiration(4)
- humidity
- vel. of wind
- atmos pressure(at hill more transpiration)
- intensity of sunlight
- temperature
adaptation in plants to reduce excessive transpiration (with example)
- sunken stomata (Nerium)
- Fewer stomata
- narrow leaves (nerium)
- thick cuticle
significance of transpiration
- cooling effect
- ascent of sap
- distribution of water n mineral
location of stomata
Present on the EPIDERMIS of leaf
location of cuticle
on the UPPER EPIDERMIS of leaf
location of lenticels
Preset on the SURFACE of bark of woody stems
location of hydathodes
Present on the margins of the leaf
location of chloroplast
present in the cytoplasm of mesophyll cell
location of thylakoid
present in the stroma of the chloroplast
location of chlorophyll
present in the walls of the thylakoid
location of mesophyll cells
present in between the upper and lower layer of epidermis
