This is Just one question not multipple, please help. I always rate. States to r

Question

This is Just one question not multipple, please help. I always rate. States to remember to write out your calculations and explanations for ALL problems.

13. Liquid water moves into and out of the cell by diffusion. Water vapor also moves from the inside of the plant leaf to the ambient air by diffusion, in a process known as transpiration. This transpiration causes dissolved minerals to be moved long distances in the plant. The time t in scconds for watcr to move such a long distance d in meters is given by t (d')/D where Dis the diffusion coefficient. A reasonable value for D s 2.4 x 10 s m2/sec. (Note: water vapor diffuses in air much more rapidly than in liquid water) The path of the diffusion of water vapor from a leaf into the air varies considerably, but a measured distance of 1 mm is reasonable (1 mm 10 s m) a. How long (in seconds does it take a molecule of water vapor to be lost by this leaf? Hairiness of leaves is a genetic trait. Leaf hairs may double the distance water must diffuse b. How long (in seconds) would it take to lose water from a hairy leaf?

Explanation / Answer

For A molecule of water vapor to be lost by the leaf, first it has to diffuse from the cell through the cellular fluids and reach the leaf. From the leaf it has to be transpired in form of water vapor.

Time take=. d2/D= 10-3 x 10-3/2.4 x 10-5 = 0.04166 seconds. This is time taken non hairy leaf

Time taken for hairy leaf = d2/D = 2 x 10-3 x 2 x 10-3 / 2.4 x 10-5 = 0.16666 seconds

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.