Respiration

Question 1

What is respiration?

Answer 1

An exothermic reaction that is continuously occuring inside living cells

Question 2

Name three uses of the energy released in respiration

Answer 2

To provide energy for
1. Muscle contraction for movement
2. For keeping warm
3. For the chemical reactions to build larger molecules

Question 3

What is aerobic respiration?

Answer 3

Respiration that occurs when there is a sufficient supply of oxygen so glucose is completely oxidised

Question 4

Where does aerobic respiration take place?

Answer 4

In the mitochondria

Question 5

What is the word equation for respiration?

Answer 5

Glucose+ Oxygen→ Carbon dioxide + Water

Question 6

What is the symbol equation for respiration?

Answer 6

C₆H₁₂O₆ + O₂ → CO₂ + H₂O

Question 7

Does aerobic respiration release a lot or a little energy?

Answer 7

A lot of energy

Question 8

Why does aerobic respiration release a lot of energy?

Answer 8

There is a sufficient supply of oxygen
So glucose is completely oxidised

Question 9

Where does anaerobic respiration take place?

Answer 9

In muscle cells
In plants
In yeast

Question 10

Why does anaerobic respiration take place?

Answer 10

Whne there is an insufficient supply of oxygen
So glucose is incompletely oxidised

Question 11

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

Answer 11

Glucose → Lactic acid

Question 12

Does anaerobic respiration release a lot or a little energy?

Answer 12

A little energy

Question 13

Why does anaerobic respiration only release a little energy?

Answer 13

The oxidation of glucose is incomplete as there is an insufficient supply of oxygen

Question 14

What is the word equation for anaerobic respiration in plants and yeast?

Answer 14

Glucose → Ethanol + Carbon Dioxide

Question 15

What is anaerobic respiration in yeast called?

Answer 15

Fermentation

Question 16

What is fermentation used for in industry?

Answer 16

1. Making alcohols
2. Making bread

Question 17

How does the fermentation of yeast produce alcohols?

Answer 17

The ethanol produced in the anaerobic respiration (fermentation) is used to make beer or wine

Question 18

How does the fermentation of yeast help to produce bread?

Answer 18

The carbon dioxide produced in the anaerobic respiratoin (fermentation) makes bubbles which causes the bread to rise

Question 19

In respiration, glucose is oxidised and energy is [blank]

fill in the blank

Answer 19

In respiration, glucose is oxidised and energy is RELEASED

Energy is NOT PRODUCED, it is RELEASED

Question 20

Compare aerobic respiration with anaerobic respiration

Answer 20

In aerobic respiration, glucose is completely oxidised as there is a sufficient supply of oxygen, this a lot of energy is released- in anaerobic respiration, glucose is incompletely oxidised as there is an insufficient supply of oxygen and so less energy is released than aerobic respiration

In aerobic respiration th products are carbon dioxde and water, in anaerobic respiration in muscle cells, lactic acid is produced

1. need for oxygen, 2. differing products 3. amount of energy used