Carbon Cycling & Climate Change

Which category of organisms is correctly described in this table?

• A

• B

• C

• D

What limits the length of a food chain in an ecosystem?

• The size of the individual organisms

• Competition between organisms

• The loss of energy between trophic levels

• Natural selection

What are characteristics of species?

• I and II

• I and III

• II and III

• I, II and III

The statement is about the role of some bacteria in ecosystems. What mode of nutrition is described?

• They are autotrophs

• They are consumers

• They are saprotrophs

• They are detritivores

The diagram represents a pyramid of energy. What level does the letter X represent?

• Light

• Primary consumers

• Abiotic environment

• Producers

What is the classification of an organism that is able to make organic compounds from inorganic nutrients?

• Autotroph

• Consumer

• Detritivore

• Saprotroph

How is peat formed?

• From methanogenic archeans under anerobic and acidic conditions in deep sea vents

• From partially decomposed organic matter under anaerobic and acidic conditions in waterlogged soils

• From porous limestone under high pressure, aerobic and alkaline conditions in ocean beds

• From bituminous coal under high pressure, anaerobic conditions below ground

What contributes to rising atmospheric concentrations of carbon dioxide and increases average global temperatures?

• An increase in shorter wave radiation emitted by the Earth.

• An increase in longer wave radiation emitted by the Earth.

• An increase in the combustion of fossilized organic matter

• The depletion of the ozone in the stratosphere

• Nothing - it's all a hoax

Methanogens produce methane gas. What is the gas converted to in the atmosphere?

• Carbon dioxide and oxygen

• Ethanol and carbon dioxide

• Carbon monoxide and ozone.

• Carbon dioxide and water

Which characteristic of water vapour classifies it as a greenhouse gas?

• It absorbs then re-emits some of the long wave radiation emitted by the Earth's surface

• It prevents short wave radiation from reaching the Earth's surface

• It absorbs UV radiation but does not re-emit it

• It absorbs infra-red radiation but does not re-emit it