photosynthesis

Question 1

where does photosynthesis take place and why

Answer 1

choroplasts in green plant cells as they contain pigments e.g chlorophyll, which absorb light

Question 2

is photosynthesis endo or exo

Answer 2

endothermic, light is taken from environment

Question 3

photosynthesis WORD EQUATION

Answer 3

carbon dioxide + water —> glucose + oxygen

Question 4

photosynthesis SYMBOL EQUATION

Answer 4

6CO2 + 6H2O → C6H12O6 + 6O2

Question 5

5 ways plants use glucose

Answer 5

respiration
making cellulose
making amino acids
stored as oils or fats
stored as starch

Question 6

how do plants use glucose for respiration

Answer 6

transfers energy from glucose.
now plant can convert the rest of the glucose into other substances

Question 7

how/why do plants use glucose for making cellulose

Answer 7

glucose converted to cellulose
makes strong plant cell walls

Question 8

how do plants use glucose for making amino acids

Answer 8

glucose combined with nitrate ions from soil.
makes amino acids which are then made into proteins

Question 9

how do plants use glucose to store as oils or fats

Answer 9

glucose turns into lipids (fats and
oils).
for storing in seeds

Question 10

how do plants use glucose to store as starch

Answer 10

glucose turned into starch
gets stored in roots, steams and leaves. ready for when photosynthesis isnt happening e.g winter

Question 11

why foes starch being insoluble make it better for storing than glucose

Answer 11

glucose isnt insoluble so it would draw in lots of water and swell

Question 12

4 example of limiting factors of photosynthesis and example

Answer 12

light eg night
temperature eg winter
CO2 concentration eg if its warm and bright
chlorophyll eg diseased or environmental stress

Question 13

why is chlorophyll a limiting factor of photosynthesis

Answer 13

affected by disease or environmental stress. damages chloroplasts or restricts chlorophyll production. less light absorbed

Question 14

what energy in used in photosynthesis

Answer 14

light

Question 15

what happened to the rate of photosynthesis as light level rises

Answer 15

increases steadily
up to certain point
any further, temp or co2 is now limiting factor

Question 16

describe rate of photosynthesis as co2 increases

Answer 16

increase up to a point
any further, temp becomes limiting factor

Question 17

what happens to the rate of photosynthesis as temperature changes

Answer 17

too low - enzymes work slowly
too hot - enzymes denature

Question 18

explain rate of photosynthesis as light changes practical

Answer 18

light places distance from pondweed for certain time
oxygen released during phsyths collects in capillary tube
at the end, syringe to draw gas bubble next to ruler and measure gas

Question 19

what is the inverse square law

Answer 19

light intensity

(is proportional to)

1/distance^2

Question 20

how can you artificially create ideal farming conditions in a greenhouse FOR HEAT

Answer 20

greenhouse traps heat so temp doesnt become limiting.
in winter, use a heater.
in summer, use shades and ventilation

Question 21

how can you artificially create ideal farming connections in a green house
FOR LIGHT

Answer 21

artificial light

Question 22

how can you artificially create ideal farming conditions in a greenhouse FOR CARBON DIOXIDE

Answer 22

use a paraffin heater. as it burns, it makes co2 as a by-product

Question 23

5 ways to artificially create ideal farming environment

Answer 23

greenhouse
heater or shades for temo control
artificial light
paraffin heater
enclosed from pests/disease