Exam 5: Ecosystems and Matter Cycling

Rhizobia refers to ________.

An underground formation of loose materials may be ________.

Water moves through the hydrological cycle fuelled by energy from ________.

Acid deposition is due mainly to human interference in the ________.

The dominant limiting factor for freshwater aquatic ecosystems and for plant growth in terrestrial systems is usually ________.

What are the two main human impacts on the carbon cycle?

When organic wastes are added to a body of water, ________.

Most nutrients have a large, slow-moving abiotic pool and a rapidly exchanged biotic pool.

The elements that make up your body have undergone millions of years of recycling.

Everything is either matter or energy.

Eutrophication tends to increase populations of ________ at the expense of ________.

Bacteria are an important component of the sulphur cycle because ________.

Seventy-five per cent of the world's fresh water is held in ________.

What is cultural eutrophication? What are the main nutrient sources contributing to it? What can we do to minimize cultural eutrophication?

________ has/have the highest buffering capacity in terms of acid deposition.

The largest atmospheric constituent is ________.

Leaf decay in the tropics takes ________, while in the boreal forest it takes ________.

Carbon dioxide gas accounts for ________ of the atmosphere.

________ is NOT a characteristic of oligotrophic ecosystems.

Phosphorus availability in soil is dependent on soil pH.