\ biology -transport system in living thin

Question 1

All cells need to
take in
-
-
-

AND
give out
-
-
-

Answer 1

Take in
-water
-food
-oxygen
AND

give out
-carbon dioxide

Question 2

example of diffusion

Answer 2

• tea particles spreading out of a tea bag without stirring

- a drop of ink spreading in still water

Question 3

how do substances move in and out of the cell?

Answer 3

• osmosis

- diffusion

Question 4

what is diffusion?

Answer 4

diffusion is the net movement of particles from a region of higher concentration to a region of lower concentration.

Question 5

what is membrane?

Answer 5

• usually a thin layer or barrier made of something

- that is PARTIALLY-PERMEABLE

Question 6

what is partially-permeable

Answer 6

has small hole(called pores)that let small molecules through but not large molecules

Question 7

what is osmosis

Answer 7

• a special type of diffusion
• refers only to:
  1. the diffusion of water molecules
  2. must past through partially permeable membrane

Question 8

definition of osmosis

Answer 8

• osmosis is the movement of water molecules
• from a region of higher water POTENTIAL to a region of lower water potential
• across a partially permeable membrane

Question 9

what is the sciencific term for water carrying tube

Answer 9

xylem

Question 10

is the location of xylem inner or outer

Answer 10

inner

Question 11

what is the sciencific term for food carrying tube

Answer 11

phloem

Question 12

features and function of xylem

Answer 12

features

• make out of dead cell and have thick wall
• run from stem to the leaves

function 
-carries dissolved mineral and water from the roots to all the parts of the plant

Question 13

features and function of phloem

Answer 13

feature
-made of living cells and thin wall
-fun from the leaves to all part of the plants
functions
-carries dissolved food in the form of sugar ,from the leaf of every leaf to every part of the plant

Question 14

how does water enter a plant

Answer 14

• water moves into roots by osmosis into the root hair cell
• root hair is LONG AND NARROW:
  
  • to increase surface area for the efficient absorption of water and mineral salts

Question 15

how does mineral salts move into the roots

Answer 15

• mainly by diffusion
• root hair cell has a long and narrow projection called root hair
• increase surface area to volume ratio for efficient absorption of water and mineral salts

Question 16

what is transpiration

Answer 16

transpiration is the loss of water vapour through the leaves of a plant