Tag: plant water relation

Questions Related to plant water relation

$Na^+ / K^+$ pump in a cell is an example of

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

  1. Osmosis

  2. Diffusion

  3. Passive transport

  4. Active transport.

Show answer
Correct Option: D

Active transport of ions by a cell requires

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

  1. High temperature

  2. Low temperature

  3. Alkaline pH

  4. ATP

Show answer
Correct Option: D
Explanation:
  • Active transport can be defined as the movement of molecules and ions across a cell membrane from a region of lower concentration (of the molecules) to the region of higher concentration i.e, movement of molecules occurs against the concentration gradient. 
  • This transport requires cellular or metabolic energy which is available in the form of ATP molecules produced within the cell.
  • So, the correct answer is 'ATP'.

Which is not true of active transport

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

  1. It is chemical process

  2. Energy is obtained from ATP

  3. Occurs through carrier molecules

  4. Not modified by enzymes.

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Correct Option: A

Active transport is characterised by

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

  1. Requires special membrane proteins

  2. Highly selective

  3. Requires ATP energy

  4. All of the above

Show answer
Correct Option: D
Explanation:
  • Active transport can be defined as the movement of molecules or ions across a plasma membrane from a region of lower concentration (of molecules or ions) to a region of higher concentration, against the concentration gradient. 
  • For this cellular energy is required which is available in the form of ATP molecule and enzymes.
  • So, the correct answer is 'All of the above'.

It is not characteristic of active transport

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

  1. Highly selective

  2. Insensitive to inhibitors

  3. Uphill transport

  4. Transporter saturates.

Show answer
Correct Option: B

The energy is required in absorption of water by

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

  1. Active absorption

  2. Passive absorption

  3. Both passive and active absorption

  4. None of the above

Show answer
Correct Option: A
Explanation:

Absorption of water takes place by both active and passive absorption.
Water, as per some theory, is absorbed against the concentration gradient. This type of absorption is termed active absorption where the movement is against the concentration gradient and requires energy in the form of ATP.

Most of the plants observe passive absorption, meaning, the movement is without utilization of metabolic energy. 
Thus, the correct answer is option (C). 

Glucose and amino acids are absorbed in intestine by

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

  1. Osmosis

  2. Passive transport

  3. Active transport

  4. Selective absorption

Show answer
Correct Option: C
Explanation:

The monosaccharides glucose and galactose are transported into the epithelial cells by common protein carriers via secondary active transport I.e  by co-transport with sodium ions. The monosaccharides leave these cells via facilitated diffusion and enter the capillaries through intercellular clefts.

Thus C is the correct option. 

Movement of materials against concentration gradient is achieved by

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

  1. Active trasnport

  2. Passive transport

  3. Diffusion

  4. Osmosis

Show answer
Correct Option: A
Explanation:

  • Active transport is the transport where the direct expenditure of energy takes place and the molecules move against the gradient which is from lower concentration to the higher concentration.
  • Passive absorption is the absorption which takes place without expenditure of energy. The water molecules move from higher concentration to the lower concentration which is towards the gradient. 
  • In diffusion, the ions or molecules randomly diffuses the semipermeable membrane along the concentration gradient.
  • Osmosis is the process of diffusion of molecules from the region of higher concentration to the lower concentration through a semipermeable membrane. 
So, the correct answer is option A.

State whether the following statements are true or false.
Carrier proteins are necessary for active transport to occur.

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

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Carrier proteins are those which facilitate diffusion of molecules across the cell membrane, they allow movement of molecules in and out of the cells against the concentration gradient. Active transport requires carrier proteins also called as pumps. They need ATP energy because the transport is uphill, against the concentration gradient.

So, the correct answer is 'True'. 

Choose the correct answer from the alternatives given.
The sodium potassium pump moves sodium and potassium ions across the plasma membrane by

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

  1. Facilitated transport

  2. Active transport

  3. Cotransport

  4. Endocytosis

Show answer
Correct Option: B
Explanation:

The sodium-potassium pump in a cell membrane works via active transport. It uses a carrier protein and utilizes ATP molecules. It transports the sodium ions to the extracellular space, increasing their concentration there and in turn moves potassium ions inside the cell. This pump moves three potassium ions inside the cell for every two sodium ions moved outside.


So, the correct answer is 'active transport'.