B8 - photosynthesis fact test

Question 1

is photosynthesis an exothermic reaction or an endothermic reaction

Answer 1

endothermic as energy is taken in from the environment

Question 2

why is photosynthesis carried out

Answer 2

to make food in the form of glucose

Question 3

what is the word equation for photosynthesis

Answer 3

carbon dioxide + water –> glucose and oxygen

(light energy written above the arrow)

Question 4

what is the symbol equation for photosynthesis

Answer 4

6CO2 + 6H2O –> C6H12O6 + 6O2

(light energy written above the arrow)

Question 5

what is glucose used for

Answer 5

C - used to make Cellulose for strong cell walls
R - Respiration to release energy from glucose, occurs in mitochondria
O - used to produce lipids (Oils and fats) for storing in seeds
P - combined with nitrates to make amino acids (then make Proteins) to help the plant grow
S - stored as Starch in roots, stems and leaves, it is insoluble therefore good for storing

Question 6

how do you get carbon dioxide for photosynthesis

Answer 6

from the air enters the leaf via the stomata

Question 7

how do you get water for photosynthesis

Answer 7

absorbed by roots via osmosis, drawn up through xylem due to transpiration

Question 8

how do you get light for photosynthesis

Answer 8

trapped by chlorophyll in the chloroplasts

Question 9

what are the limiting factors of photosynthesis

Answer 9

• concentration of carbon dioxide
• temperature
• light intensity
• amount of chlorophyll

Question 10

what is the inverse square law

Answer 10

links light intensity and distance. As distance increases, light intensity decreases. Light intensity is quartered as distance from the light source is doubled)

Question 11

what is the equation for light intensity

Answer 11

1 divided by distance squared

Question 12

what does the use of paraffin lamps produce

Answer 12

carbon dioxide and heat