respiration and photosynthesis

Question 1

why is carbon dioxide concentration a factor effecting photosynthesis

Answer 1

-increasing Co2 concentration increases rate of photosynthesis

although above a certain threshold increases in co2 concentration do not increase the rate o photosynthesis because light intensity is limiting the rate of reaction

Question 2

light intensity as a factor of photosynthesis

Answer 2

increases light intensity incrwsss rate of photosynthesis because more energy is provided

if light intensity is increased above a certain threshold then rate of photosynthesis will not infewsss because temp is limiting the reaction

Question 3

temp increase as a factor of photosynthesis

Answer 3

increasing temp increases rate of photosynthesis because more energy is provided if the temp is increased above 45 degrees the enzymes that catalyze the reaction begin to denature

Question 4

uses of glucose

Answer 4

proteins: needed for cell growth & repair
starch: insoluble cannot be dissolved and stored in stems, leaves or roots
cellulose: strengthen cell walls , particularly important for fast growing plants

fats and oils: stored in structures such as seeds

Question 5

what is dependent and independent variable for investigating light intensity of photosynthesis

Answer 5

independent- light intensity

number of bubbles- dependent variable

Question 6

what is the inverse square law

Answer 6

light intensity= 1 divided by distance squared

Question 7

what wohld affect the reliability of the required practical

Answer 7

measuring the rate of photosynthesis multiple times per experiment

Question 8

whag is homeostasis

Answer 8

to keep body temp of warm blooded animals relatively constant

Question 9

what happens to glucose in anaerobic respiration in plants

Answer 9

glucose is converted into ethanol and carbon dioxide

Glucose= ethanol + carbon dioxide

in yeast cells this is called fermentation.

Question 10

aerobic respiration with oxygen what happens to glucose

Answer 10

glucose reacts with oxygen in the mitochondria of cells to give carbon dioxide water and energy

Glucose+ oxygen + co2 +water + (energy )

c6H12O6 + 6O2+ 6CO2+ (energy )

Question 11

why does anaerobic respiration haooen

Answer 11

when insufficient oxygen reaches th muscles during periods of intense activity

Question 12

whag is metabolism

Answer 12

sum of all chemical reactions that happen in an organism

Question 13

metabolic reaction: making amino acids

Answer 13

combining glucose & nitrate ions to make amino acids

amino acids can be then combined to make proteins

Question 14

metabolic reaction : breaking down excess proteins

Answer 14

breaking down excess proteins to form urea which is excreted in urine

Question 15

metabolic reaction : converting glucose

Answer 15

converting glucose into starch (plants ) glycogen (animals ) and cellulose (plants )

Question 16

mestoblic reaction : making lipids

Answer 16

combining glycerol and fatty acid chains to make lipid molecules

Question 17

factors to increase respiration : increase in breath volume

Answer 17

an increase in breath volume also increases the rate of gas exchange

Question 18

increase in respiration : blood vessels dilate

Answer 18

blood vessels dilate (open wider) to ensure more blood reaches the muscles

Question 19

increase in respiration : increase in breathing rate

Answer 19

increase in breathing rate increases gas exchange in the lungs with more oxygen take in and more carbon dioxide released

Question 20

increase in respiration: increase heart rate

Answer 20

increase in heart rate delivers more blood (containing glucose and oxygen ) to the muscles

Question 21

lactic acid in anaerobic respiration

Answer 21

lactic acid is a by product of anaerobic respiration

it is toxic and can build up in muscles leading to muscular pain and fatigue

also stops muscles contracting efficiently

Question 22

oxygen debt

Answer 22

oxygen debt refers to extra oxygen required after excercise to oxidize (combine with oxygen ) lactic acid and remove it from cells

Question 23

replaying oxygen debt

Answer 23

blood transports lactic acid to the liver where it reacts with oxygen to produce carbon dioxide and water

heavy breathing after excercise helps to repay oxygen debt by taking in more oxygen into lungs

Question 24

what is anaerobic respiration

Answer 24

if muscles are not supplied with enough oxygen then muscle cells may begin to respire anaerobicallg and produce lactic acid

Question 25

what is lactic acid

Answer 25

toxic and can build up in muscles. this leads to muscular pain and fatigue. lactic acid build up results in an oxygen debt

Question 26

what is limiting factor in mineral deficient soil

Answer 26

chlorophyll concentration