Tag: plant water relation

Quizzes (6) Questions (146)

Questions Related to plant water relation

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

State whether the following statements are true or false.
ATP is required for active transport.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Active transport is usually associated with accumulating high concentrations of molecules that the cell needs such as ions, glucose, and amino acids. The processes use chemical energy for this, it comes from the hydrolysis of the ATP molecule which maintains the electrochemical gradient. Hence ATP is required for active transport. 

So, the correct option is 'True'.

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

State whether the following statements are true or false.
In the sodium-potassium pump, sodium is transported out of the cell and potassium is trapsported into the cell as ATP is broken by a membrane protein.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

ATP acts as a solute pump, it's an enzyme that pumps out sodium and pumping potassium in the cells, exports three sodium, and two potassium ions. It is an active transport leading to the hydrolysis of ATP molecules to provide the required energy.

So correct answer is 'True'.

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

Which one of the following processes requires an input of energy?

  1. Active transport

  2. Diffusion

  3. Facilitated diffusion

  4. Osmosis
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

An input of energy is required in the process of active transport as it involves the movement of ions or molecules across a cell membrane from low to high concentration. The movement requires energy to maintain the electrochemical gradient.

So, the correct option is 'Active transport'.

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

State whether the following statements are true or false.
The movement of ions or molecules against a concentration gradient with the utilisation of energy is known as active transport.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The movement of ions or molecules against a concentration gradient (from lower to higher concentration) across a cell membrane with the utilization of energy is known as active transport. Active transport needs cellular energy which is given by ATP hydrolysis.

So, the correct option is 'True'.

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

Choose the correct answer from the alternatives given.
Which is the best definition of active transport?

  1. Movement of molecules from an area of their higher concentration to an area of their lower concentration

  2. Movement of water across a semi-permeable membrane from an area of high water concentration to an area of lower water concentration

  3. Movement of molecules from an area of their lower concentration to an area of their higher concentration

  4. Movement of a substance against its concentration through the release of energy from ATP
Reveal answer Fill a bubble to check yourself
D Correct answer
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 against their concentration gradient. This is termed as active transport of molecules across the cell membrane.

So, the correct answer is 'Movement of a substance against its concentration through the release of energy from ATP'.
Multiple choice biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

Which of the following is an energy dependent process?

  1. Facilitated diffusion

  2. Active transport

  3. Endosmosis

  4. Exosmosis
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Active transport (secretion) is an energy-dependent process that selectively moves a substance against its electrochemical gradient across a cell membrane. It is an energy dependent process, in which ATP is utilised.

Thus the correct option is B. 

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

Uphill transport i.e., movement of substances from their lower concentration to their higher concentration occurs in

  1. Simple diffusion

  2. Facilitated diffusion

  3. Active transport

  4. Both B and C
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In active transport, the movable carrier proteins are called pumps. They employ ATP energy for transport across the membrane. It is uphill transport, i.e., against concentration gradient and is faster than passive transport. The rate of active transport reaches the maximum when all the protein pumps are being used in transport(saturation effect). Carrier proteins are highly specific like enzymes. They are also sensitive to inhibitors that react with protein side chains. So, the correct answer is 'Active transport'.

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

Channel proteins allow ions that would not normally pass through the cell membrane to go through the channel. What properties of the proteins are responsible for this? 

  1. The channels are often composed of charged or polar $R$ groups.
  2. The channels are often composed of hydrophobic $R$ group.
  3. $a$ and $b$

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Facilitated diffusion, therefore, allows polar and charged molecules, such as carbohydrates, amino acids, nucleosides, and ions, to cross the plasma membrane. Two classes of proteins that mediate facilitated diffusion are generally distinguished.

So, the correct option 'The channels are often composed of charged or polar R groups'.

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

The movement of ions against the concentration gradient is

  1. Active transport

  2. Osmosis

  3. Diffusion

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Active transport is the movement of molecules across a cell membrane in the direction against their concentration gradient, i.e. moving from an area of lower concentration to an area of higher concentration.