EVERYDAY SCIENCE

Detailed explanation-1: -A parasite is an organism that lives on or in a host organism and gets its food from or at the expense of its host. There are three main classes of parasites that can cause disease in humans: protozoa, helminths, and ectoparasites.

Detailed explanation-2: -Parasitism is a nonmutual relationship between two organisms in which one benefits at the expense of the other. There are two types of parasites affecting living organisms: ectoparasites (living on the surface of host) and endoparasites (living in the body of host).

Detailed explanation-3: -A parasite is an organism that lives in or on another living body known as the host. The parasite that lives inside the body of the host is called an endoparasite and the parasite that lives on the body surface of the host is called an ectoparasite.

Detailed explanation-4: -Answer and Explanation: The correct answer is (b) One species uses another species as food or shelter causing harm. (b) One species uses another species as food or shelter causing harm. Parasitism or parasitic creation is a type of relationship where one organism depends on another organism for food and shelter.

Detailed explanation-5: -Among the endoparasites, some can live inside the host cells and are called intracellular parasites. Plasmodium falciparum is one such parasite, because it lives and grows inside the red blood cells of people who have malaria. Figure 2-Ectoparasites vs. endoparasites.