Bio-energetics (Topic 4)

Question 1

What is the word equation for photosynthesis?

Answer 1

Carbon dioxide + water —> oxygen + glucose

Question 2

What is an independent variable?

Answer 2

The thing that you change in a experiment

Question 3

What a dependent variable?

Answer 3

The thing that you measure in a experiment

Question 4

What is a control variable?

Answer 4

The thing that you keep the same in a experiment

Question 5

Is photosynthesis exothemic or endothermic?

Answer 5

Endothermic

Question 6

What organelle in a plant does photosynthesis?

Answer 6

Chloroplasts

Question 7

Where are chlorophyll found?

Answer 7

In chloroplasts

Question 8

5 things that glucose can be used for?

Answer 8

1. For respiration
2. Converted into starch for storage
3. Used to produce fat or oil
4. Used to produce cellulose for cell walls
5. Used for protein synthesis which produces amino acids

Question 9

How does the rate of photosynthesis affect the biomass of a plant?

Answer 9

More photosynthesis means more grows, so more biomass.

Question 10

Give two reasons that they may be less chlorophyll in the leaf.

Answer 10

1. If the plant has a disease, like tobacco mosaic virus or rose black spot.
2. If the plant does not have enough minerals like magnesium.

Question 11

What happens in your muscles during exercise?

Answer 11

1. There is a build up of lactic acid which contributes to muscle fatigue.
2. Muscles stop contracting effectively.
3. An oxygen dept is created.

Question 12

What happens to lactic acid build up?

Answer 12

Sent to the liver which it is converted back into glucose.

Question 13

What is oxygen dept?

Answer 13

The amount of oxygen the body needs after exercise to get rid of the lactic acid

Question 14

How does your body clear the oxygen dept?

Answer 14

You keep a higher breath rate and deep breaths after exercise to repay the dept.

Question 15

For the effect of light intensity practical. How do you measure the rate of photosynthesis?

Answer 15

Count the number of bubbles released in a given time.

Question 16

For the effect of light intensity practical. What is the independent variable?

Answer 16

Distance of the lamp from the pondweed.

Question 17

For the effect of light intensity practical. Why would you add a heat shield?

Answer 17

To be able to control the temperature of the pond weed.

Question 18

What type of reaction in respiration?

Answer 18

Exothermic

Question 19

What does mitochondria do?

Answer 19

Respiration

Question 20

Name two cells that have lots of mitochondria in?

Answer 20

Muscle cells and sperm cells

Question 21

What does carbohydrates break down into?

Answer 21

Sugar/glucose

Question 22

What does lipids break down into?

Answer 22

3 fatty acids and glycerol

Question 23

What does protein break down into?

Answer 23

Amino acids

Question 24

What is the word equation for respiration?

Answer 24

Glucose + oxygen —> carbon dioxide + water

Question 25

What is the chemical equation for respiration?

Answer 25

C*6-H*12-O*6 + O*6 —> C-O*2 + H*2-O

Question 26

What affects photosynthesis?

Answer 26

Carbon dioxide levels, light intensity, temperature

Question 27

What is the word equation for anaerobic respiration in yeast cells?

Answer 27

Glucose —> ethanol + carbon dioxide

Question 28

What is anaerobic respiration in yeast called?

Answer 28

Fermentation

Question 29

What is yeast used in?

Answer 29

Alcohol and bread

Question 30

What happens to your heart rate during exercise?

Answer 30

Heart rate increases, more blood is carried to working muscles. (More oxygen and glucose)

Question 31

Three reasons that organisms need energy?

Answer 31

1. Chemical reactions 2. Movement 3. Warmth

Question 32

What is the word equation for anaerobic respiration in muscles?

Answer 32

Glucose —> lactic acid

Question 33

Why is anaerobic respiration not as efficient as aerobic respiration?

Answer 33

Glucose isn’t fully broken down, so much less energy is transferred.