bioenergetics test

Question 1

what reaction is photosynthesis and what energy does it use

Answer 1

photosynthesis is a chemical reaction which uses light energy

Question 2

where does photosynthesis take place

Answer 2

photosynthesis takes place inside chloroplasts

Question 3

what absorbs the light for photosynthesis

Answer 3

the green pigment inside chloroplasts called chlorophyll absorbs the light

Question 4

begins w e

what reaction is photosynthesis

Answer 4

photosynthesis is a endothermic reaction

Question 5

word equation for photosynthesis

Answer 5

water + carbon dioxide -> glucose + oxygen

Question 6

whats the symbol equation for photosynthesis

Answer 6

6H20 + 6CO2 -> C6H12O6+602

Question 7

where do plants get water from

Answer 7

water is obtained from the roots by osmosis -> root hair cells have a large surface area to support osmosis happening faster

Question 8

where do plants get CO2 from

Answer 8

diffuses into the leaves via open pores called stomata

Question 9

what are the 5 uses of glucose

Answer 9

respiration - releases energy from glucose
stored as starch - can be used when plant is not photosynthesising as much e.g. in the dark. starch is insoluble
making cellulose for the cell wall
making amino acids - glucose combines w nitrate ions to make amino acids which then go to make proteins
stored as fats and oils

Question 10

whats the test to detect for the presence of starch

Answer 10

use iodine positive result for starch - iodine would turn blue/black

Question 11

test to detect for the proteins of starch

Answer 11

use iodine negative results would be if iodine would remain orange/brown

Question 12

why would green plants exposed to light will test positive for iodine whereas green plants exposed to no light wont

Answer 12

the chlorophyll is green and absorbs light needed for photosynthesis. photosynthesis can occur and glucose produces excess glucose is stored as starch. green plants exposed to no light for the chloroplasts to absorb. no photosynthesis will occur no glucose will be produced so no excess glucose to be stored as starch

Question 13

what are the 3 main limiting factors of photosynthesis are

Answer 13

light intensity, CO2 concentration and temp

Question 14

why could chlorophyll also be a limiting factor

Answer 14

chlorophyll can also be a limiting factor of photosynthesis as it absorbs the light needed

Question 15

why would a plant have a reduced number of chlorophyll give 3 examples

Answer 15

rose black spot, tobacco mosaic virus and lack of magnesium ions f

Question 16

what was the independent variable in the investigation

Answer 16

power of the bulb

Question 17

calculate x in the table

Answer 17

1.1 = 20 min then times it by 3
3.3 = 60 min

Question 18

write a balanced symbol equation for the process of respiration when oxygen is available

Answer 18

602 + C6H12O6 –> 6CO2 + 6H20

Question 19

oxygen is absorbed through the alveoli in the lungs how r they adapted for this function

Answer 19

permeable walls - allow gases to pass through and it has very large surface area

Question 20

name the gas excreted through the alveoli

Answer 20

carbon dioxide

Question 21

describe the respiration which takes place in human beings when oxygen is not available and give an effect

Answer 21

glucose anaerobically respires to make lactic acid since not enough oxygen is delivered to the cells to aerobically respire. a build up of lactic acid can cause muscle fatigue additionally less energy is produced due to incomplete oxidation of glucose

Question 22

what is the purpose of respiration

Answer 22

to release energy for metabollic reactions in cells

Question 23

give one other metabollic reaction in cells

Answer 23

conversion of glucose to starch, glycogen and cellulose

Question 24

what 2 conclusions can be made

Answer 24

tickbox 1 and 2 males have higher metabolic rate and as age increases mean metabolic rate of males…

Question 25

calculate the percentage decrease in the mean metabollic rate of males between 5 and 45 years of age

Answer 25

(36-53)/53 = 0.3207 then x 100 = 32.07 = 32.1%

Question 26

describe the 2 differences of person r and person s

Answer 26

person r has a lower increase in heart rate
person s’s heart rate had the highest peak at 132 while person r’s peaked at 99 minute before person s

Question 27

calculate how much time it would take the heart rate of person s

Answer 27

132-78 = 54 then 54/12 = 4.5

Question 28

how can oxygen production be used to show the rate of phtosynthesis

Answer 28

more energy is produced in given time

Question 29

name the factor that is limiting the rate of photosynthesis at point x

Answer 29

light intensity

Question 30

explain the results when the light intensity was 0 lux

Answer 30

oxygen production is less than 0 so its taking place ,respiration is taking place + overall production is negative