Tag: plant water relation

Questions Related to plant water relation

Active transport

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

  1. Releases energy

  2. Requires energy

  3. Produces ATP

  4. Produces a toxic substance

Show answer
Correct Option: B
Explanation:

There are two types of absorption mechanisms i.e., active and passive transport. Active transport is the movement of solute or solvent molecules against the concentration gradient. It requires the expenditure of energy in the form of ATP. Thus, the correct answer is option B.

Carrier protein helps in

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

  1. Transport of ions across the membrane

  2. Passive ions absorption

  3. Water absorption

  4. Vaporization

Show answer
Correct Option: B
Explanation:
Carrier proteins help in passive movement of molecules across the plasma membrane
Example GLUT, aquaporin etc
So, the correct answer is 'Passive ions absorption'

Active transport across cell membrane requires

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

  1. Glucose

  2. Steroids

  3. Energy in the form ATP

  4. Proteins and glucose

Show answer
Correct Option: C
Explanation:

In active transport, substances move against a concentration gradient across a cell membrane. Hence energy is required. The energy available in the body in the form of ATP is used to move this substance across the cell membrane. Thus the correct answer is option C.

Movement of ions r molecules against electrochemical gradient is called ______________.

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

  1. Pinocytosis

  2. Diffusion

  3. Active transport

  4. Brownian movement

Show answer
Correct Option: C

Active absorption is affected by:

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

  1. Osmotic concentration

  2. Associate tissue structures

  3. Transpiration

  4. Sucking capacity of root hair

Show answer
Correct Option: A
Explanation:

Active absorption refers to absorption against the concentration gradient. Absorption of a solute from a region of low concentration to a region of higher concentration by the help of energy, is called active absorption. Hence, active absorption depends on osmotic concentration.

Active transport involves the transport of molecules across a cell membrane.
In order to establish and maintain a concentration gradient, which of the following condition is suitable?

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

  1. Free energy is used to drive molecules back-and-forth across the transmembrane protein.

  2. Free energy is used to drive molecules and across a transmembrane protein against the concentration gradient.

  3. No free energy is required.

  4. There must be an equal quantity of molecules on both sides of the membrane.

Show answer
Correct Option: B
Explanation:

Free energy obtained from hydrolysis of ATP is used for the movement of solutes against their concentration gradient across the plasma membrane using a transport transmembrane protein also called pump

So, the correct answer is 'Free energy is used to drive molecules and across a transmembrane protein against the concentration gradient'

In the light of carrier concept, the transport of ion across the membrane against concentration gradient is

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

  1. Passive process

  2. Non-osmotic process

  3. Osmotic process

  4. Active process

Show answer
Correct Option: D
Explanation:

According to carrier concept for transport of ion in plants, transport is mediated by specific carriers. When the ion is transported against the concentration gradient, the ion carrier is activated in presence of ATP and a kinase enzyme. The activated carrier forms a complex with an ion at the outer surface and transported in. Because this process involves ATP, hence, it is called active process.

Carrier proteins are involved in the

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

  1. Active transport of ions

  2. Passive transport of ions

  3. Water transport

  4. Both A and B

Show answer
Correct Option: D
Explanation:

Active transport is the movement of a substance across a membrane against its concentration gradient. Unlike channel proteins which only transport substances through membranes passively, carrier proteins can transport ions and molecules either passively through facilitated diffusion, or via secondary active transport.

Therefore D is the correct option. 

Active transport across biomembrane involves

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

  1. Production of ATP

  2. Requirement of energy

  3. Production of toxin

  4. Release of energy

Show answer
Correct Option: B
Explanation:
  • Active transport is a process by which molecules move across the cell membrane from a region of low concentration to a region of high concentration against the concentration gradient using energy.
  • This energy requirement is fulfilled by the ATP molecules (metabolic energy).
  • The substances which are transported across the cell membrane by active transport are- Na+, K+, Mg2+, and Ca2+.
  • So, the correct answer is 'Requirement of energy'.

Minerals are absorbed by the plants, through

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

  1. Pressure flow

  2. Diffusion

  3. Active transport

  4. Osmosis

Show answer
Correct Option: C
Explanation:

Minerals are absorbed by plants through active transport as minerals are present in the soil mostly in the form of charged particles which fail to move across cell membrane and concentration of minerals in the cell is usually greater than that present in the soil solution. Therefore, most of the minerals are absorbed by active mechanism involving expenditure of energy in the form of ATP.

Hence, C is the correct answer.