Question

Organisms belonging to class: Cyclostomata are all ______.

A.Ectoparasite
B.Endoparasite
C.Autotroph
D.Holozoic

Answer 1

Hint: Parasitism is a mutual association between organisms in which one species, the parasite, resides on or within another species, the host, causes some damage, and is structurally adjusted to this lifestyle.

Complete answer:
First we should know about animal nutrition to answer this question. In animals, nutrition is as essential as it is for plants. Via the photosynthesis process, plants prepare their entire food, but animals do not produce their own food, so they need to rely on plants and other animals for their nutrition.

Now, let us find the solution from the options-
- Cyclostomes are jawless, and they are like creatures belonging to the Agnatha division. They possess a sucking or circular mouth that makes ectoparasites for them.
- Endoparasites are considered parasites that reside within the host. Endoparasites are classified into two types: intra - cellular and inter-cellular parasites. Intercellular parasites are those which occupy the spaces of the host's body. Endoparasites are intercellular parasites that reside inside the host cell. Thus, option B is not the correct option.
- An autotroph is an animal that absorbs carbon from basic substances like carbon dioxide to create complex organic compounds, usually using energy through light and inorganic chemical reactions. Thus, option C is not the correct option.
- Holozoic nutrition is a form of heterotrophic nutrition characterised by the internalisation of gaseous, solid or liquid food particles and their internal processing. Thus, option C is not the correct option.

Hence, the correct answer is option (A)

Note: Parasites decrease host fitness, from parasitic castration to alteration of host behaviour, through general or specific pathology. By manipulating hosts for resources required for their existence, in general by feeding on them and using secondary hosts to aid in their propagation from one primary host to the next, parasites improve their own fitness.