NEET Biology question
Not in NEET syllabus
Choose the true and false statements from the following and select the correct option from the set given below.
I. Diffusion is an important process of transport in plants since it is the only means for gaseous movement within the plant body. II. In active transport, pumps are proteins that use energy to carry substances across the cell membrane against the concentration gradient. III. In facilitated diffusion, special proteins help hydrophilic substances to be transported across the membrane. IV. In diffusion, molecules move against the concentration gradient in a random manner. V. Facilitated diffusion is faster than active transport.
Solution
I, II and III are correct descriptions of diffusion of gases, active transport pumps, and carrier proteins in facilitated diffusion respectively. IV is false — diffusion moves molecules *along*, not against, the concentration
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