Bionenergetics

Question 1

light intensity being taken in for photosynthesis is endothermic/exothermic

Answer 1

endothermic

Question 2

Leaves adaptationd for photosynthesis

Answer 2

large SA for higher light absorption
thin for gases to diffuse easily
veins containing xylem + phloem

Question 3

Rate of photosynthesis depends on…

Answer 3

1. Light intensity
2. CO2 concentration
3. temperature
4. amount of chlorophyll

Question 5

How do farmers remove limiting factors?

Answer 5

greenhouses, heaters, ventilation, CO2 cylinders, artificial lights

Question 6

Glucose uses (FOSRAC)

Answer 6

F ats
O ils=produced for storage in plant
S tarch= for storage, easily converted back
R espiration= broken down to release energy
A mino acids= used in protein synthesis
C ellulose= strengthens cell wall

Question 7

Respiration is endothermic/exothermic?

Answer 7

exothermic

Question 8

energy from respiration is used for…

Answer 8

movement, keeping warm, carrying out chemical reactions to build larger molecules

Question 9

aerobic respiration happens where?

Answer 9

mitochondria

Question 10

anaerobic respiration happens when…

Answer 10

muscles work very hard

Question 11

anaerobic respiration equation (in muscles)

Answer 11

glucose -> lactic acid

Question 12

anaerobic respiration equation (in plants)

Answer 12

Glucose -> carbon dioxide + ethanol

Question 13

Responses to exercise

Answer 13

1. Increased heart rate = more blood to muscles
2. increased breathing rate = more oxygen
3. increased breathing volume = more oxygen

Question 14

what causes oxygen debt?

Answer 14

a build up of lactic acid

Question 15

what is oxygen debt

Answer 15

1. lactic acid transported to liver by blood
2. converted back into glucose using oxygen
3. however much oxygen used to do this is oxygen debt

Question 16

metabolism def

Answer 16

the sum of all the reactions in a cell/organism, molecules either made or broken down

Question 17

metabolism reaction examples (6)

Answer 17

1. Respiration
2. Photosynthesis
3. digestion + synthesis of Carbohydrates, Proteins and Lipids
4. glucose converted into cellulose/ starch in plants or glycogen in animals
5. glucose + nitrate ions -> aino acids -> proteins
6. excess proteins broken down to form urea for excretion