photosynthesis

Question 1

Photosynthesis

Answer 1

photosynthesis is a process where plants make glucose from sunlight
carbon dioxide and water turn into oxygen and glucose
takes place in chloroplast and contains pigment called chlorophyll
photosynthesis is endothermic

Question 2

photosynthesis equation

Answer 2

carbon dioxide + water = glucose and oxygen

6C02 + 6H20+ C6H1206 +6O2

Question 3

Uses of glucose

Answer 3

respiration
making cellulose
combines to nitrate ion to make amino acids
stored as oil/fat in seeds
stored as starch and used when photosynthesis is less effective

Question 4

Factors affecting rate of photosynthesis

Answer 4

light intensity 
concentration of carbon dioxide 
temperature 
water 
amount of chlorophyll

Question 5

Limiting factors

Answer 5

stops photosynthesis from happening at a faster rate
depends on environmental condition
example
night time light intensity is limiting factor
winter temperature is limiting factor

Question 6

Light intensity

Answer 6

lights provides energy increase light intensity =increased photosynthesis rate
beyond a certain point light has no effect as it is not a limiting factor

Question 7

Carbon dioxide concentration

Answer 7

carbon dioxide is a reactant needed for photosynthesis
as concentration increases photosynthesis rate increases
beyond a certain point carbon dioxide concentration no longer has an effect and is not the limiting factor

Question 8

amount of chlorophyll

Answer 8

Amount of chlorophyll in the plants can be affected by disease or lack of nutrients
these cause chloroplast to be damaged
less chlorophyll and rate of photosynthesis is reduced

Question 9

temperature

Answer 9

enzymes are involved if temperature is too low enzymes do not have enough energy
photosynthesis right is slow at 45 degrees enzymes are at optimum temperature
beyond 45 degrees they are denatured
photosynthesis rate of reaction decreases

Question 10

Measuring rate of photosynthesis

Answer 10

As distance increases light intensity decreases
inverse proportion
light intensity decreases in proportion to squared distance

Question 11

Inverse square law

Answer 11

light intensity (a.u.)= 1/distance^2

Question 12

ideal conditions for photosynthesis

Answer 12

greenhouses trap Suns heat to make sure temperature is not limiting factor
winter heaters are used
summer shades/ventilation
use artificial light during night
common dioxide levels increase buy paraffin heater
plants in greenhouse prevent diseases from pests
fertilizers to provide minerals for growth

Question 13

leaf adaptation

Answer 13

broad leaves
     increased surface area 
thin leaves
     short diffusion distance
chlorophyll
    absorbs light
veins
    transport water via xylem and removes photosynthesis products 
air spaces
    allows CO2 to enter and O2 to leave
stomata 
    control opening of stomata for gaseous exchange to prevent water loss

Question 14

test for oxygen produced

Answer 14

use water plant (elodea) collect gas bubbles produced during photosynthesis
gas will relight glowing splint