NURSING ANM AND GNM

NURSING EXAM QUESTIONS

BIOCHEMISTRY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which of the following properties of water enables it to move from the roots to the leaves of plants?
A
Water expands as it freezes.
B
Water is an excellent solvent.
C
Water exhibits cohesive behavior.
D
Water moderates temperature.
Explanation: 

Detailed explanation-1: -Since water is attracted to other molecules, adhesive forces pull the water toward other molecules. Water is transported in plants through both cohesive and adhesive forces; these forces pull water and the dissolved minerals from the roots to the leaves and other parts of the plant.

Detailed explanation-2: -Capillary action helps bring water up into the roots. With the help of adhesion and cohesion, water can work it’s way all the way up to the branches and leaves.

Detailed explanation-3: -The cohesive properties of water (hydrogen bonding between adjacent water molecules) allow the column of water to be ‘pulled’ up through the plant as water molecules are evaporating at the surfaces of leaf cells. This process has been termed the Cohesion Theory of Sap Ascent in plants.

Detailed explanation-4: -Hydrogen bonds cause water to be exceptionally attracted to each other. Therefore, water is very cohesive.

Detailed explanation-5: -Which property of water allows it to move upward from the roots of a tree to its leaves? As water evaporates from the leaves of trees, the property of cohesion (attraction to another water molecule) allows the water molecules leaving the plant to pull molecules upward because they are attracted though hydrogen bonds.

There is 1 question to complete.