Page 18 - ingilizce

Nematodes : Small (usually microscopic) roundworms with both free- living and parasitic
forms. Not all nematodes are pests.

Nitrogen : An odorless, colorless, tasteless gas which makes up nearly four fifths of the earth's

atmosphere. When it combines with oxygen through the action of nitrogen-fixing bacteria, it
can become incorporated into living tissue as a major part of protein.

Nocturnal : Coming out at night.

Nourish : To promote or sustain growth.

Oligochaeta : Name of the class of annelids to which earthworms belong, characterized by

having setae.

Optimal : Most favorable conditions, such as for growth or for reproduction.

Organic : Pertaining to or derived from living organisms.

Organic matter : Material which comes from something which was once alive.

Organism : Any individual living thing.

Oxygen : Gaseous element in the earth's atmosphere essential to life as we know it.

Pest : An organism which someone wants to get rid of.

Pesticide : A chemical, synthetic or natural, which kills pests.

pH : An expression for degree of acidity and alkalinity based upon the hydrogen ion

concentration. The pH scale ranges from 10'to 14, pH of 7 being neutral, less than 7 acid, greater

than 7, alkaline.

Posterior : Toward the rear, back, or tail.

Protein : Complex molecule containing carbon, hydrogen, oxygen, and nitrogen, a major
constituent of meat. Worms are approximately 60% protein.

Protozoa : Plural for protozoan, a one- celled organism belonging to the animal kingdom.

Most protozoa live in water and can be seen only with a microscope. Some move by means of
tiny hairs called cilia, others by a whip-like tail called a flagellum, and others by false feet

called pseudopodia like amebas have.

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