Question

Hello need help with some practice questions. thanks!

7. What is the advantage of repelling water from a leaf surface? 8. What is the saturated water vapor versus temperature curve and how can it be used to compute transpiration when air relative humidity and leaf/air temperature are known? 9. How is transpiration be computed according to the Ohm's Law analogy for electrical circuits?

Answer 1

e) enൾ മhാം , Transpiration is a process loss siration is a proces that involver tha of coater Caroun through the stomater of plants. 2) fannsson through to be o necessary cort or evil 'to suroo the piany to aboorb water from the soil رو 7 9 دج و و زر سے) eہم ماهان andrasbo Portant sients in three major "CaIONS . Cooling of the plant: the loss of conter veroon from the erant coals dooo pant cools down the bront Dhen the weather is very hot the ston 2) Franspirational sul when the plant loves water through transpiration from the leaves, water and minerals salts from and sten anal roots moves, oris pulled, osword in to the leaves. Water and therefore taken wo won the Gol 67 osmosis and finally exists the plants through the sto- mata. - 3 plant Gructure: young plants on plants without wo gody stenu are require water for structura Quaport. # Temperature Jemp. offees the freinsairation rate two ways firstly at wormer temp. water morecule move fouten, and the rate of evaxoration from stomato is there t fre much faster. - 2 the water holding capacity of warmiar is areater than that of cold air. Assuming that cold aux canot may be gatrrowed and therefore have a shallow water concentration gradient while the warm aus may will be able to hold more water vapour, and will therefore have a steeoer wat en cone. Gradient rate #dronico

Relative hamidry. Po reffered to as the humidity. Deuter e y moved to o Concert action recient. therefore when the humidity to high Clots of water pre vanour the art the water potential gradient beat the poside of the beat stomata and the atmosphere is shamol and the rote of transpiration will be low - 3 blowerch it the atmon bere esday there will be a stees water concentration gradient sets the hamid Paride the of the stomats and the out side of the Stomato and the outside air and the Eate of transpiraton will therefore be fast. - rects of prensies humidity 6. for ohn's law analogy & skleaf3 Ek leate electrical circuits. ve u teat- Sen -0.4 mpa Sheat over k stena stem K moot Proot v.2 mpat up soil = -0.05 mpa Absorption

water in xylem conditions is said to be metaboeic Condition when px is below wapoun pressure of water (a) because the continuity of waten column. once broken will not rejoin until px sires to cances cegove that of pl. - van den Honeet (1948) quan Lied the C-T theor 7 on a classic papen in which he viewed the fron of waten en the plants gis a catenary process Van den Floocet propored the ohms law analogue for water frow in prenys. - the driving force of san frow 2 euaporative flex density from leaves E is proportional to negative of the precure gradient C-del ala) out any point chrow- section) along the drone piration stream, - - dp xl dx - AElkht (fg da/dx) - 26) cohere A = leaf area supplied water by a stem segment with teamaulic conductivity of th and 2 chlox is the gravitational potential gradient where po density of coaten 9 = accelaration due to gravity and dhl dx = height gained oth perunit elrtance dx traveled by water for the stem seqmento. In the context of stem segmentts of length cl) with finite presure drops across the end of the segment.