Tag: transport of molecules

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Questions Related to transport of molecules

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

Transporting pull arise mainly from

  1. Roots

  2. Leaves

  3. Stems

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

As water is lost from the surface of the leaves due to transpiration a strong suction force is transmitted through the active mesophyll cells to the ends of the water column in the root. This is called transpiration pull. It caused the entire water column to be pulled upwards. When the rate of transpiration is very high and the rate of absorption is slow the water in the xylem elements of the leaf develops a state of tension.

So, the correct answer is B.

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

Which of the following does not operate in the carrier concept of active absorption of minerals?

  1. Electron transport

  2. Contractile protein

  3. Protein lecithin

  4. Ascending water stream
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Plants absorb minerals from the soil in the form of inorganic ions. The process of mineral absorption and water absorption are separate processes occur in plants. Water absorption takes place actively by root pressure whereas mineral absorption takes place actively with the help of carrier proteins.
So the correct answer is 'Ascending water stream'.
Multiple choice biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

Mineral absorption is mostly

  1. Physical process

  2. Chemical process

  3. Active process

  4. Passive process
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Mineral absorption takes place in two phases: active absorption and passive absorption. It mostly occurs using active absorption phase because it is a fast process of mineral absorption, utilise energy and unidirectional. It is a biochemical process that occurs against the concentration gradient with the help of carriers and pumps.
So the correct answer is 'Active process'.
Multiple choice biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

Which one is not connected with transport across the cell membrane?

  1. Osmosis

  2. Active transport

  3. Diffusion

  4. Surface tension
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

(A) Osmosis is the movement of the solute molecule from lower concentration to higher concentration through a semi-permeable membrane.

(B) Active transport is the transport of molecules which is energy dependent.
(C) Diffusion is the movement of molecules from a higher concentration to lower concentration.
(D) Surface Tension is the elastic tendency of a fluid surface to cover the least possible surface area.
So, the correct answer is 'Surface Tension'.