Chapter 37 Quiz 1

Which of the following components of a sewage treatment works removes large solids from the sewage?

• screen

• grit chamber

• sedimentation tank

• aeration tank

Which of the following components of a sewage treatment works removes grit from the sewage?

• screen

• grit chamber

• sedimentation tank

• aeration tank

Which of the following components of a sewage treatment works removes suspended solids from the sewage?

• screen

• grit chamber

• sedimentation tank

• aeration tank

Which of the following components of a sewage treatment works breaks down organic matter in the sewage?

• grit chamber

• sedimentation tank

• aeration tank

• sludge digester

Which of the following components of a sewage treatment works breaks down organic matter in the sludge?

• grit chamber

• sedimentation tank

• aeration tank

• sludge digester

A ____________ is a species that plays a crucial role in maintaining the balance and functioning of an ecosystem.

• pioneer species

• dominant species

• keystone species

• endangered species

Interbreeding (a) _____________ the genetic variation within a species. This may make the species (b) ___________ to adapt to environmental changes.

• (a) increases；(b) more able

• (a) increases；(b) less able

• (a) reduces；(b) more able

• (a) reduces；(b) less able