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Uphill transport I.e. movement of substa...

Uphill transport `I.e.` movement of substances from their lower concentation to their higher concentration occurs in

A

simple diffusion

B

facilitated diffusion

C

active transport

D

both `(b)`and `(c)`.

Text Solution

Verified by Experts

The correct Answer is:
C
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 then 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.
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Movement of a substance from the area of low concentration to an area of high concentration is called diffusion.

Imbibition/diffusion is the movement of substances from the region of their higher concentration to the region of lower concentration.

Knowledge Check

  • The movement of free atoms from higher concentration to lower concentration is called

    A
    Osmosis
    B
    Diffusion
    C
    Endosmosis
    D
    Exosmosis

  • With reference to the movement of molecules of fluid in plant, consider the following statements - 1. Diffusion is the movement of molecules of a substance from the region of their higher concentration to the region of their lower concentration. 2. Osmosis is a process in which the water molecules move through a semipermeable membrane from the region of their lower concentration to the region of their higher concentration. Which of the above statements is/are correct ?

    A
    1 only
    B
    2 only
    C
    Both 1 and 2
    D
    Neither 1 nor 2

  • Each question contains STATEMENT-I(Assertion) and STATEMENT-2(Reason).the statement carefully and mark the correct answer accoring to the instrution given below: STATEMENT - 1 : Osmotic involves movement of solvent molecules from lower concentration to higher concentration. STATEMENT - 2 : Solutions having the same osmotic pressure are called isotonic solutions.

    A
    If both the statements are TURE and STATEMENT-2 is the correct explanation STATEMENT-1
    B
    If both the statements are TURE but STATEMENT-2 is NOT the correct explanation STATEMENT-1
    C
    If STATEMENT-1 is TURE and STATEMENT-2 is FALSE
    D
    If STATEMENT-1 is FA,SE and STATEMENT-2 is TRUE

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    Transporting substances across a membrane from an area of lower concentration to an area of higher concentration requires -

    Assertion (A): Oxygen enters the cells in the tissues through the thin walls of the blood cap- illaries by the process of diffusion. Reason (R): Diffusion occurs from the region oflower concentration to the region of higher concentration.

    Assertion :If a bottle filled with volatile substance (such as perfume ) is opened at a corner of the room the odour of substance can be smelled from another corner Reason:Volatile substance diffuses from the region of higher concentration to the region of lower concentration

    Molecules which are transported across the membrane against their concentration gradient, i.e., from the lower to higher concentration . Such a transport is called

    The movement of solvent molecules from higher concentration to lower concentration through semipermeable membrane under pressure is termed :

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