Bioenergetics

Question 1

How does photosynthesis produce glucose

Answer 1

By using light

Question 2

What is the word and symbol equation on photosynthesis

Answer 2

Carbon dioxide +water—>glucose+oxygen
6CO2+6H2O—>C6H12O6+6O2

Question 3

What 5 ways do plants use glucose

Answer 3

For respiration
-transfers energy from glucose
Making glucose
-glucose converted into cellulose
Making amino acids
-glucose combined with nitrate ions
Stored as fats or oils
-glucose turned into lipids
Stored as starch
Glucose turned into starch and stored in roots

Question 4

What are the limiting factors to photosynthesis

Answer 4

Combined environmental factors
-night
-winter
-the amount of co2
Chlorophyll in leaf

Question 5

What combined environmental effects limit photosynthesis

Answer 5

Night
Winter
If bright and warm enough the amount of co2 is limiting

Question 6

How does no enough light slow down photosynthesis

Answer 6

As light level is raised,rate of photosynthesis increases but only up to a certain point

Question 7

How does too little carbon dioxide slow down photosynthesis

Answer 7

As light intensity co2 will increase the rate to a point
As co2 increases,rate no longer does ,shows that co2 is not limiting

Question 8

Why does temp have to be just right for photosynthesis

Answer 8

Due to it affecting enzymes
If plant gets too hot the enzymes get damaged
This happens at 45*

Question 9

How can you measure the rate of photosynthesis

Answer 9

Source of white light placed at specific
distance from pondweed
Pondweed left to photosynthesis for set time ,oxygen will collect in capillary tube
At end the length of gas bubble is measured .this is proportional to the volume of Co2 produced
The controll variables are temp and time
Experiment is repeated to find a mean
And then repeated with light source in diff distance

Question 10

How is the inverse square law link to light and distance

Answer 10

As distance increases light intensity decreases
Inversely proportional

Question 11

How can you artificially create the ideal conditions for farming

Answer 11

Growing in greenhouse
Greenhouses trap suns heat and makes sure temp isn’t limiting ,in winter farmers use heaters to keep temp at ideal level
I’m summer it could get too hot so they might use shades or ventilations to cool

Question 12

Benefits and cost of greenhouses

Answer 12

Easier to keep pest and disease free
It costs money to keep all the conditions just right

Question 13

What is respiration

Answer 13

The process of tranfering energy from glucose which goes in every cell

Question 14

What does respiration tranfer energy for

Answer 14

Build up larger molecules from smaller ones
In animals it allows mucked to contract
In mammals and birds it’s used to keep body temp

Question 15

What is metabolism

Answer 15

Is all the chemical reactions in an organism

Question 16

In a metabolism reaction what larger molecules are made from smaller

Answer 16

Lots of small glucose molecules join together in reactions to form starch,glycogen,cellulose
Lipids made from one molecule of glycerol and three fatty acids
Glucose combined with nitrate ions to make amino acids

Question 17

In other reactions what larger moles are broken down into smaller

Answer 17

Glucose broken down in respiration
Excess proteins is broken down in a reaction to produce urea

Question 18

What’s the word equation for aerobic respiration

Answer 18

Glucose+oxygen——carbon dioxide+water

Question 19

What’s the word equation for anerobic equation and what’s the properties of it

Answer 19

Glucose——lactic acid
Used in emergencies

Question 20

What’s the word equation for anaerobic equation in plants and yeast

Answer 20

Glucose——ethanol+carbon dioxide
In yeast this is called fermentation
Used in beer and wine making

Question 21

What happens when you exersize

Answer 21

Breathing rate and volume increase to get more O2 in blood and heart rate increases (this removes co2)
When vigorously exersizing your body can’t supply oxygen to muscles quickly so they have to anerobically respire
This is not the best due to it building up lactic acid causing muscle fatigue

Question 22

How does anerobic respiration lead to oxygen derby

Answer 22

Oxygen derby is the amount of extra oxygen your body needs to react with the lactic acid and remove it
The pulse and breathing raye stay high whist there at high levels of lactic acid and co2