PS AND CR S/A

Question 1

why are you sore during strenous physical activity?

Answer 1

The soreness is due to build-up of lactic acid in the muscle tissues which causes the muscle fatigueness.

Question 2

contrast autotrophs and heterotrophs

Answer 2

autotrophs are organisms that make their own food.
heterotrophs are organisms that need to ingest food to obtain energy.

Question 3

describe the photosynthesis lab with spinach.

Answer 3

when the jar with spinach inside is covered with tin foil, there is no oxygen present that causes the increase release of CO2, while, when the jar with spinach inside is exposed to the light, the release of carbon dioxide decreases.

Question 4

chemical equation for photosynthesis.

Answer 4

6 CO2 + 6 H2O —-> C6H12O6 + 6O2
(six carbon dioxide molecules combined with six water molecules are converted into light energy captured by chloropyll into a sugar molecule and six oxygen molecules.

Question 5

equation for cellular respiration

Answer 5

C6H12O6 + 6O2 —-> 6CO2 + 6 H20 + energy
(glucose + six oxygen molecules broken down into six carbon dioxide molecules + six water molecules + energy)

Question 6

contrast anaerobic and aerobic respiration.

Answer 6

aerobic respiration is the breakdown of pyruvate in the presence of oxygen.
anaerobic respiration is the chemical reaction that release energy from food molecules in the absence of oxygen.

Question 7

CAM plants

Answer 7

cactus, orchids, pineapple

Question 8

C4 plants

Answer 8

sugarcane,corn