* not completed

. What is the main source of the carbon used by plants in photosynthesis?

Fertilizers correct incorrect

Hydrocarbons in the ground correct incorrect

Carbon dioxide in the air correct incorrect

* not completed

. Which of the following is NOT a carbohydrate?

Cellulose correct incorrect

Glucose correct incorrect

Methane correct incorrect

Starch correct incorrect

* not completed

. Sugar cane is an example of which type of primary bioenergy source?

Woody correct incorrect

Starchy/sugary correct incorrect

Cellulosic correct incorrect

* not completed

. Miscanthus, when grown as an energy crop propagates using rhizomes. Select the best description of rhizomes from the list below.

Underground stems correct incorrect

Seed heads correct incorrect

Yellow flowers correct incorrect

* not completed

. How much wood charcoal was produced globally in 2015?

7 million tonnes correct incorrect

12 million tonnes correct incorrect

52 million tonnes correct incorrect

* not completed

. Which process is used to produce biomethane from dung, sewage or food processing wastes?

Anaerobic digestion correct incorrect

Fermentation correct incorrect

Transesterification correct incorrect

* not completed

. What is the main useful component of landfill gas?

Hydrogen correct incorrect

Carbon monoxide correct incorrect

Methane correct incorrect

* not completed

. What powerful greenhouse gas is produced by the breakdown of nitrogen compounds in the soil?

Ammonia correct incorrect

Nitrous oxide correct incorrect

Hydrogen sulfide correct incorrect

* not completed

. What is the main financial mechanism used in the UK to improve the economics of landfill gas and energy from waste (EfW) plants?

gate fees for waste correct incorrect

feed-in tariff correct incorrect

carbon tax correct incorrect

* not completed

. How much bioethanol was produced in the USA in 2015?

14.8 billion US gallons correct incorrect

5.4 billion US gallons correct incorrect

900 million US gallons correct incorrect