photsynthesis

Question 1

what is photosynthesis

Answer 1

the process by which plants synthesise glucose using light energy from the sun.Light energy is converted into chemical energy

Question 2

where does photosynthesis take place

Answer 2

Within chloroplasts in leaf palisade cell.They contain chlorophyll,a pigment which absorbs light energy

Question 3

State equation for photosynthesis (word+equation)

Answer 3

carbon dioxide+water~glucose+oxygen
6CO2+6H20~C6 H12 O6+ 6O2

Question 4

IS photosynthesis an exothermic or an endothermic reaction

Answer 4

Endothermic-energy is transferred from the environment to chloroplasts by light

Question 5

Give examples of leaf adaptations which maximise the rate of photosynthesis

Answer 5

broad leaves-maximise surface area
thin leaves-short diffusion distance
Chlorophyll present- trap light energy
transport water to leaves via xylem,remove photosynthesis products via phloem
guard cells-control opening of stomata for gaseous exchange

Question 6

what are 4 main factors that affect rate of photosynthesis

Answer 6

temperature,light intensity, Carbon dioxide concentration, amount of chlorophyll

Question 7

how does temperature affect rate of photosynthesis

Answer 7

Increasing temperature increases the rate of photosynthesis as the kinetic energy of particles is increased. The rate decreases past a certain temperature as enzymes become denatured

Question 8

how does light intensity affect rate of photosynthesis

Answer 8

Increasing light intensity increases the rate of photosynthesis until another factor becomes limiting

Question 9

how does carbon dioxide concentration affect rate of photosynthesis

Answer 9

Increasing the CO2 concentration increases rate of photosynthesis(until another factor become limiting) as CO2 is required to make glucose

Question 10

how does the amount of chlorophyll affect rate of photosynthesis

Answer 10

Decreasing the amount of chlorophyll (e.g) due to lack of magnesium) decreases the rate of photosynthesis as chlorophyll is required to absorb light energy

Question 11

what is a limiting factor

Answer 11

An environmental factor which can restrict the rate of photosynthesis e.g. light intensity

Question 12

how can farmers use their knowledge of limiting factors to increase their profits

Answer 12

They can control temperature , light intensity and CO2 concentration to achieve the fastest possible rate of photosynthesis,leading to a greater yield

Question 13

state 5 uses of glucose produced during photosynthesis

Answer 13

respiration,starch for storage, cellulose for strength, amino acid and protein synthesis, lipids for energy storage in seeds