GENERAL HISTOLOGY

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INTRODUCTION

CELL STRUCTURE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Unicellular organisms include bacteria, some algae, and some animals. They live in virtually every environment on the planet. Which of the following statements BEST describes the ratio of unicellular animals to multi-cellular animals?
A
Multicellular organisms outnumber unicellular organisms only in terrestrial environments
B
Unicellular and multicellular organisms exist in about the same number in both aquatic and terrestrial environments
C
Unicellular organisms outnumber multicellular organisms in both aquatic and terrestrial environments.
D
Multicellular organisms outnumber unicellular organisms only in aquatic environments.
Explanation: 

Detailed explanation-1: -These are called unicellular organisms. Although much smaller, unicellular organisms can perform some of the same complex activities as multicellular organisms. Many unicellular organisms live in extreme environments, such as hot springs, thermal ocean vents, polar ice, and frozen tundra.

Detailed explanation-2: -Some examples of unicellular eukaryotes are – Amoeba, Euglena, Paramecium, Yeasts, and Mushrooms. These organisms have a simple body organization without the presence of any cell differentiation.

Detailed explanation-3: -The Protista is a large complex grouping of mostly unicellular eukaryotic organisms. They are morphologically diverse and can be found in most terrestrial, aquatic, and marine habitats as free-living forms and as parasites of other protists, of fungi, and of plants and animals.

Detailed explanation-4: -Escherichia coli. Diatoms. Protozoa. Protista. Streptococcus. Pneumococci. Dinoflagellates.

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