Photosynthesis

Question 1

Give some examples of why living organisms need energy

Answer 1

active transport, anabolic reactions (building polymers), movement

Question 2

What are anabolic reactions?

Answer 2

small molecules are assembled into large ones - energy is required

Question 3

What are catabolic reactions?

Answer 3

large molecules are broken down into small ones - energy is released

Question 4

Is energy used or released when break bonds?

Answer 4

energy is used to break bonds

Question 5

Is energy used or released when forming bonds?

Answer 5

energy is released when bonds are made

Question 6

Describe the bonds/energy in small inorganic molecules

Answer 6

joined by strong bonds and so need a lot of energy to break them apart and they release a lot of energy when they are made

Question 7

Describe the bonds/energy in organic molecules

Answer 7

organic molecules contain more but weaker bonds - this means they require less energy to be made and less energy to be broken

Question 8

Describe the importance of bonds in respiration

Answer 8

When breaking down glucose an oxygen, very little energy is released. The excess energy released is used to synthesise ATP.

Question 9

Describe the importance of bonds in photosynthesis

Answer 9

When breaking bonds in water and carbon dioxide, it requires a lot of energy. Whereas making bonds in glucose and oxygen, not very much energy is released.