Tag: plant water relation

Questions Related to plant water relation

All the following involve osmosis except.

biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

  1. Movement of water from soil to root

  2. Movement of water from root hair to endodermis and pericycle

  3. Movement of water between xylem elements

  4. Movement of water form xylem to mesophyll cell of leaves

Show answer
Correct Option: A

Consider the following events involved in stomatal opening:
1. Turgor pressure of guard cells increases
2. $K^+$ ions move into guard cells
3. pH of guard cells decreases
4. Water moves into guard cells
What is the correct sequence of these events leading to stomatal opening:

biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

  1. 2-4-3-1

  2. 3-2-4-1

  3. 2-3-4-1

  4. 3-1-2-4

Show answer
Correct Option: A

Choose the correct answers from the alternatives given :
The osmotic pressure of pure water is

biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

  1. 0

  2. 0.1

  3. 1

  4. 10

Show answer
Correct Option: A
Explanation:

Osmotic pressure is the minimum pressure applied to prevent the inward flow of solvent molecules from a dilute solution into the concentrated solution, where both solutions are separated by a semipermeable membrane. 

The osmotic pressure would be zero if pure water were on both sides of the semi-permeable membrane. 

So the correct answer is "0"

Active transport from outside to inside of molecule across a membrane requires

biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

  1. Cyclic AMP

  2. Acetyl chlorine

  3. ATP

  4. Phloroglucinol

Show answer
Correct Option: C
Explanation:

Active transport from outside to the inside of molecules across a membrane requires ATP. It is required in transferring solutes across the membrane may be through an ATPase which creates ph gradient across the membrane. Thus, the correct option is C.

ATP molecules combine with carrier molecules and allow passage of substances.

biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

  1. Along concentration gradient

  2. Against concentration gradient

  3. Both A and B

  4. ATP is not required

Show answer
Correct Option: B
Explanation:

In the active transport, there is a movement of some substance from low concentration to the high concentration i.e., against the concentration gradient wit the help of ATP combined with carrier molecules.

Thus, the correct answer is option B.

All mineral salts absorbed in cells are

biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

  1. Ions

  2. Atoms

  3. Molecule

  4. All of the above

Show answer
Correct Option: A
Explanation:

All mineral salts are present in soil as charged ions adsorbed to clay particles. The minerals are absorbed in charged forms and not in uncharged forms through the exchange process. Thus, the correct answer is option A.

Glucose and amino acids are absorbed in the intestine by

biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

  1. Active transport

  2. Passive transport

  3. Selective absorption

  4. Osmosis

Show answer
Correct Option: A

In which one of the following, expenditure of energy is required?

biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

  1. Osmosis

  2. Diffusion

  3. Active transport

  4. Passive transport

Show answer
Correct Option: C
Explanation:

Active Transport uses energy to pump molecules against a concentration gradient and is carried out by membrane proteins.

Which of the following means of transmembrane transport involves the expenditure of energy by the cell and can move materials up a concentration gradient?

biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

  1. Osmosis

  2. Facilitated diffusion

  3. Simple diffusion

  4. Active transport

Show answer
Correct Option: D
Explanation:
In one form of transport across the cell membrane, ATP is utilized. The utilization of an ATP molecule provides the cell with an energy boost which enables the transport of different molecules across the cell membrane. This is termed as active transport of molecules across the cell membrane.
So, the correct answer is 'Active transport'.

Decreasing order concentration of minerals inside cell is

biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

  1. Ca$^{+2}$$-$K$^+$$-$Na$^+$.

  2. K$^+$$-$Ca$^{+2}$$-$Na$^+$.

  3. K$^+$$-$Na$^+$$-$Ca$^{+2}$.

  4. Na$^+$$-$K$^+$$-$Ca$^{+2}$.

Show answer
Correct Option: C
Explanation:
Potassium ions are usually higher inside the cell than outside the cell, and its concentration inside the cell is about 10 to 30 fold higher than the other components, while sodium ion is higher outside the cell than inside the cell. 
So, the answer is C.