Question

Sheet: 1
Differentiate the following:
a) Protozoans and Metazoans (Give Example)
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Answer 1

Answer:(a) Protozoa are unicellular microscopic organisms whereas metazoa is multicellular organisms and can be seen through naked eyes.

(b) A vertebrate is an animal with a backbone and invertebrates are those animals with do not have the backbone or notochord.

(c) In Insecta, the body segment is divided into three parts: head, thorax and abdomen whereas in Arachnida the body segment is divided into two parts: cephalothorax and abdomen.  

(d) Flatworm consists of the dorso-ventrally flattened body whereas roundworm consists of a cylindrical body.

Explanation:okay?

Answer 2

Here is your answer

Metazoa is a group of multicellular animals including fish, amphibians, reptiles, birds, and mammals. However, sponges are not considered as metazoans. They are a primitive form of metazoans evolved from choanozoans that are unicellular aquatic protists sometimes forming colonies. Sponges show a single cell-level of organization and do not develop nerves or muscles as found in a regular metazoan. Also, metazoans are monophyletic as they are developed from a single ancestor.

Protozoa is a group of unicellular eukaryotes belonging to the kingdom Protista. Generally, they are single-celled organisms. As they are eukaryotes, they have a nucleus in their cytoplasm. However, some protozoans have multiple nuclei in their cytoplasm. Also, their cytoplasm consists of two regions known as ectoplasm and endoplasm. Furthermore, some protozoans are free-living in the environment while others are endoparasitic, which means they live inside organisms. Parasitic protozoans can live either inside body tissues or in the blood.

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