B4 Bioenergetics

Question 1

what is photosynthesis

Answer 1

when a plant takes in water through the roots of a plant to create glucose for energy and releases oxygen as waste

Question 2

what is the word equation for photosynthesis

Answer 2

carbon dioxide + water —> glucose +oxygen

Question 3

what is the symbol equation for photosynthesis

Answer 3

6CO2 + 6H2O —> C6H12O6 + 6O2

Question 4

more transpiration = ?

Answer 4

more photosynthesis

Question 5

what are the 5 main ways that plants use glucose

Answer 5

1) for respiration
2) making cellulose
3) making amino acids
4) stores as oils or fats
5) stored as starch

Question 6

limiting factors for photosynthesis

Answer 6

1) light
2) temperature
3) cholorophyll

Question 7

what is the method for the practical that measure the rate of photosynthesis

Answer 7

1) place a source of light at a specific distance from the pondweed
2) leave the pondweed to photosynthesise for a set amount of time. as it photosynthesises the oxygen released will collect in the capillary tube
3) use a syringe to draw the gas bubble in the tube up alongside a ruler and the length of the gas bubble is measured this is proportional to the volume of oxygen provided
4) repeat the experiment with the light source at the same distance and find the mean
5) then repeat the whole experiment with the light source at different distances from the pondweed

Question 8

what does the graph for the rate of photosynthesis and light intensity show

Answer 8

As the light intensity increases the rate of photosynthesis also increases
the rate of photosynthesis stops increasing or stays constant. It is being limited by the chlorophyll concentration,carbon dioxide or temperature

Question 9

What does the graph for the rate of photosynthesis and carbon dioxide concentration show

Answer 9

As the carbon dioxide concentration increases the rate of photosynthesis also increases
the rate of photosynthesis stops increasing or stays constant. It is being limited by the chlorophyll concentration, light intensity or temperature

Question 10

What does the graph for the rate of photosynthesis and temperature show

Answer 10

As the temperature increases the rate of photosynthesis also increases
the rate of photosynthesis stops increasing or stays constant. It is being limited by the chlorophyll concentration, light intensity or carbon dioxide concentration

Question 11

What is respiration

Answer 11

a chemical process where energy is released from glucose

Question 12

what is areobic respiration

Answer 12

areobic respiration is when glucose reacts with oxygen from the air in the mitochondria

Question 13

what the word equation for areobic respiration

Answer 13

glucose + oxygen –> carbon dioxide + water (+energy)

Question 14

what is the word equation for anaerobic respiration

Answer 14

glucose —> lactic acid (+energy)

Question 15

what is anaerobic respiration

Answer 15

a type of respiration that releases energy from glucose but does not use oxygen

Question 16

what is metabolism

Answer 16

all chemical reactions in an organism

Question 17

what is oxygen debt

Answer 17

the amount of extra oxygen you body needs to react with the build up of lactic acid and remove it from the cells. oxygen reacts with the lactic acid to form harmless co2 and water

Question 18

how do animals use the energy transferred by respiration

Answer 18

to build up larger molecules from smaller ones
to contract muscles
to keep body temperature steady

Question 19

what is the process of anaerobic respiration in yeast called

Answer 19

fermentation

Question 20

what happens to photosynthesis if the temperature is too high

Answer 20

the enzymes denature so the rate of photosynthesis rapidly decreases