B3 Movement into and out of cells

Question 1

Describe diffusion

Answer 1

movement of particles from a region of their higher concentration to a region of their lower concentration (i.e. down a concentration gradient), as a result of their random
movement

Question 2

gas exchange

Answer 2

State that some substances move into and
out of cells by diffusion through the cell
membraneex

Question 3

Describe the importance of diffusion of gases
and solutes in living organisms

Answer 3

Diffusion is vital in living organisms for gas exchange, nutrient uptake, and waste removal, maintaining cellular function

Question 4

state the influence surface area, temperature,
concentration gradient and distance have on diffusion

Question 5

What is Osmosis

Answer 5

net movement
of water molecules from a region of higher
water potential (dilute solution) to a region of
lower water potential (concentrated solution),
through a partially permeable membrane

Question 6

State how water moves into and out of cells

Answer 6

water moves into and out of cells by osmosis through the cell membrane

Question 7

describe the effects on plant tissues of immersing them in solutions of different concentrations

Answer 7

Immersing plant tissues in solutions of different concentrations induces osmotic effects, leading to water loss or gain and subsequent changes in turgor pressure

Question 8

Explain the effects on plant cells of immersing
them in solutions of different concentrations
by using the terms: turgid, turgor pressure,
plasmolysis, flaccid

Answer 8

Immersing plant cells in a hypertonic solution leads to water loss, causing the cells to lose turgor pressure, become flaccid, and undergo plasmolysis; in a hypotonic solution, cells absorb water, become turgid, and exert turgor pressure against the cell wall.

Question 9

Explain the importance of water potential and
osmosis in the uptake and loss of water by
organisms

Answer 9

Water potential and osmosis control how organisms absorb and release water, keeping them hydrated and functioning properly.

Question 10

Describe active transport

Answer 10

the movement of particles through a cell membrane from a region of lower concentration to a region
of higher concentration using energy from respiration

Question 11

Explain the importance of active transport

Answer 11

a process for movement of molecules or ions across membranes, including ion uptake by root hairs