Untreated Sewage Is Released into a River

question 31

Multiple Choice

Untreated sewage is released into a river. Which of the following statements is FALSE?

• A) The untreated sewage increases the BOD.
• B) The untreated sewage is a health hazard.
• C) The untreated sewage kills bacteria.
• D) The untreated sewage decreases the dissolved oxygen.
• E) All of the statements are true.

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Definitions:

Sebaceous Gland

A small oil-producing gland present in the skin of mammals which secretes a lubricating oily matter (sebum) into the hair follicles to lubricate the skin and hair.

Adipocyte

A cell specialized in the storage of fat, found in connective tissue.

Reticular Layer

The deeper layer of the dermis in the skin, characterized by dense irregular connective tissue.

Papillary Layer

The outermost layer of the dermis, directly underneath the epidermis, characterized by its projections called papillae that contain capillaries and sensory neurons.