Potometer works on the principle of

• amount of water absorbed equals the maount transpired

• osmotic pressure

• root pressure

• potential difference between the tip of the tube and that of the plant

Which one of the following does'nt help in molecule transport?

• Diffusion

• Osmosis

• Surface tension

• Active transport

Potometer is used to measure

• ascent of sap

• root pressure

• transpiration

• photosynthesis

The real forces responsible for the movement of water from one cell to another cell is mainly

• Osmotic Pressure (OP)

• Turgor Pressure (TP)

• Diffusion Pressure Deficit (DPD)

• imbibition

The magnitude of root pressure ranges from

• 2-5 atm

• 0.1-0.2 atm

• 1-5 atm

• 4-6 atm

Assertion: Translocation of sugar from source (leaf) to sink is defined as pressure flow hypothesis.

Reason: Translocation of the solute is facilitated through living phloem sieve tube cells.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

A plasmolysed cell can be deplasmolysed by placing it in

• isotonic solution

• saturated solution

• pure water or hypotonic solution

• hypertonic solution

48.

Which one of the following is correct for the transmembrane proteins in lipid bilayer of plasma membrane?

• They are absent in animal cells

• They act as channel proteins

• They are absent in plant cells

• They are only externally located

Na⁺/K⁺ pump is associated with

• passive transport

• active transport

• osmosis

• imbibition

What is correct about the movement of substance across the membrane in facilitated diffusion?

• It is an active transport

• It doesn't cause transport of molecules from low concentration to high concentration

• It is insensitive to inhibitors

• It is a very specific transport