Chap 5 Transpiration And Translocation

Question 1

______is t h e tr a n s po r t of food in the plant’s phloem

Answer 1

Translocation

Question 2

_____ is the livingt i s s u e t h a t c a r r i e s t h e
products (sucrose and glucose) of photosynthesis from t h e l e a v e s t o o t h e r parts of the plan

Answer 2

Phloem

Question 3

In the Phloem…..
Metabolites or assimilates are transported from the _____ to ____.

Answer 3

source to sink.

Question 4

Long distance movement in phloem is driven by a
pressure gradient by ______

Answer 4

Muench, 1930

Question 5

What are the factors that affect translocation?

Answer 5

1. Temperature
2. Light
3. Mineral deficiencies
4. Hormones

Question 6

Process wherein plants loose water in the form of vapor. Simply, the evaporation of water in plants.

Answer 6

Transpiration

Question 7

Transpiration is beneficial to the plant
because:?

Answer 7

❖ It cools the leaves
❖ Accelerates the ascent of sap
❖ Increases absorption of minerals
❖ Helps translocate mineral nutrients from
the root to the shoo

Question 8

Of all the water absorbed by plants, less than _______ is retained for growth and even less is used
biochemically . The balance is lost
by transpiration.

Answer 8

5%
Hopkins, 1999

Question 9

A single corn plant transpires_____ of water
in its lifetime

Answer 9

200 liter
Miller, 1938

Question 10

What are the Mechanisms of the Ascent of Sap?

Answer 10

1. Root pressure
2. COHESION-TENSION THEORY
   3.

Question 11

____ caused by the movement of water into roots from the soil as a result of the active absorption of nutrient mineral ions from the soil

Answer 11

root pressure

Question 12

Water movement is due to differences in
potential between soil, root, stem, leaf and
atmosphere.

Answer 12

Cohesion - tension theory

Question 13

Water follows the potential gradient from soil to
atmosphere, and is pulled together by the
cohesiveness and adhesiveness of the molecule
themselves

Answer 13

Cohesion-tension theory

Question 14

H2O stick to other H20 molecules → via H bonds

Answer 14

Cohesion

Question 15

• w a t e r sticks t o n o n w a t e r molecules → v i a H bonds

Answer 15

Adhesion

Question 16

> As plants’ leaves transpire water, a_____ is created that pulls water from roots to leaves.
This tension is maintained because water molecules display an attraction to one another called ____

Answer 16

Tension
Cohesion

Question 17

Water also adheres to the xylem elements in a process called _____

Answer 17

Adhesion

Question 18

Whatare the 2 stages process of transpiration?

Answer 18

a. Evapotranspiration of water from the
moist cell walls into the sub stomatal air
space.
b. Diffusion of water vapor from the sub
stomatal space into the atmosphere

Question 19

What are the types of transpiration?

Answer 19

•Stomatal transpiration
• Lenticular transpiration
• Cuticular transpiration

Question 20

Transpiration that occurs through stomata called_____ This type of transpiration only occurs in its presence of sunlight (in daytime).
Because stomata open in the present of sunlight and close in the darkness. In this method plants give out 90-95% water in the form of vapor.

Answer 20

Stomatal transpiration

Question 21

Sometimes transpiration occurs through lenticels, the small opening in the corky tissue covering stems and twigs, and
this type of transpiration is said to be the_______ . In this process, only 0.1% water is given off of the forms of vapor.

Answer 21

Lenticular transpiration

Question 22

Transpiration that occurs through the cuticle or cracks of
thin cuticle layer of leaves and stems is said to be cuticular
transpiration. This is a day-night process. In this process, 5-10% water is given out in the form of vapor.

Answer 22

Cuticular transpiration: