gas echange

Question 1

what type of organism do gas echange

Answer 1

multiceulular

Question 2

what is a multicellular organism

Question 3

diffusion

Answer 3

from high con to low conc

Question 4

respirartion in plants

Answer 4

• co2 is relased so from high conc in plant to low con out of plan
• absorbs oxygen

Question 5

photosyntheis

Answer 5

plants absorbs co2 and release oxygen

Question 6

at night

Answer 6

no photosynthesis
guard cells become flaccid close stomata so no gases diffuses out and no water lost to transpiration
net movment oxygen into plant
co2 net diffuses out of plant

Question 7

at day

Answer 7

guard cells become turgid and open stomata so gases can diffuse through it stomtal pores

net diffusion into plant
o out of it

Question 8

experiment set tup

Answer 8

test tube :
all have hydrocarbonate indicator + wool
a - nothing - control
b- leaf
c- test tube in aluminum foil so no light can enter
d- in gauze so some light can enter

30 min in sunlguht

Question 9

reaults

Answer 9

a - orange co2 at atmospheric levles
b-purple - ps occuring so co2 decrease
c - yellow - increase in c02
d - no change orange

Question 10

role of stomata in gas exhange

Answer 10

1. oxygen out + carbon dioxide in;
2. diffusion;
3. photosynthesis