Question

Which of the following processes could result in the net movement of a substance into a cell, if the substance is more concentrated in the cell than in the surroundings?
a. Osmosis
b. Active transport
c. Diffusion
d. Facilitated diffusion

Answer 1

Answer:

B.

Explanation:

The movement of substances(ions and molecules) against their concentration gradient is called Active transport.Since these substances are moving against whew they are already in abundance,extra energy is needed for them to move against this gradient.Therefore,ATP.,oxygen is needed by the cells undergoing this transport process to transfer substances into the cells.

It is useful for entry of substances in plants e.g glucose,and for transport of materials in intestine in man

Na-K pumps, exocytosis,endocytosis are examples of this transport process.

It is inhibited by lack of oxygen,cyanide etc.