1.1. Figure 1 shows a typical greenhouse used to generate heat for growing small batches of fruit and vegetables. 

Figure 1 

The frame can be made either from wood or aluminium.

The table below provides some relevant information about both wood and aluminium.

Use the information to evaluate the use of wood and aluminium for making greenhouse frames.

1.2. Making greenhouse frames from recycled aluminium is more sustainable than from aluminium extracted from aluminium ore.

Give two reasons why this is the case. 

1.3. The windows used in greenhouses can be made from either glass or polymers.

The table below provides some relevant information about both these materials.

Use the information from the table to suggest and explain one advantage of using polymer windows rather than glass windows.