Question

differences between...
(iii) Diffusion and Active transport. (iv) Diffusion and Osmosis.
(v) Tracheids and Vessels.
(vi) Vessels and Sieve tubes.
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Answer 1

Answer:

iii) Facilitated Diffusion

Facilitated diffusion takes place down the gradient of concentration.

Facilitated diffusion is a passive method and needs no energy.

In transportation, facilitated diffusion uses both gated channel proteins and carrier proteins.

For mainly big, polar molecules, facilitated diffusion is used which cannot cross the phospholipid bilayer as they are hydrophilic (polar molecules).

Active Transport

Active transport takes place toward the gradient of concentration.

An active method is an active transport. Thus, energy is needed.

Active transport uses proteins from the carrier. In order to adjust the shape of the carrier protein, energy is used.

To transport molecules against their gradient of concentration, active transport is used.

iv) Osmosis is the movement of solvent particles from a solution that is diluted to a more concentrated one. In contrast, diffusion is the movement of particles from a higher concentration region to a region of lower concentration.

v)  

The main difference between tracheids and vesselsis that tracheids are narrow and less efficient in water conduction whereas vessels are wide and highly efficient in water conduction. Tracheids are the major conducting elements in ferns and gymnosperms.

vi) Xylem vessels are hollow tubes made up of dead cells. ... Phloem are hollow tubes made of up many connected cells (sieve tubes elements). The cell walls between each of the cells are perforated into structures called sieve plates. Each cell contains very little cytoplasm and no nucleus.

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