Question

Which of the following is an example of multicellular organisms?

A)Chlamydomonas

B)Bacteria

C)Snake

D)Amoeba

Answer 1

Hint: As we all know, a cell is the structural and functional unit of life. Tissues are groups of similar cells that have a common function. An organ is a structure that is composed of at least two or more tissue types and performs a specific set of functions for the body. Many organs working together to accomplish a common purpose is called an organ system. Animals, plants and fungi are multicellular organisms, and for various purposes, different cells are also specialised.

Complete answer:

Tissues are groups of similar cells that have a common function. Examples are epithelial, muscle, connective, and nervous tissue. An organ is a structure that is composed of at least two or more tissue types and performs a specific set of functions for the body. Many organs working together to accomplish a common purpose create an organ system. An organism is made up of interconnected organ systems.

Unicellular, or single-celled species, on the other hand, are much smaller in size and less complex since they consist of only one cell that senses its environment, absorbs nutrients and reproduces asexually.

Tissues and Organs

Multicellular organisms assign biological roles to particular organ systems such as the skin, heart, stomach, lungs, and sex organs, such as barrier function, circulation, digestion, respiration and sexual reproduction. Many different cells and cell types are composed in these organs that work together to perform specific tasks.

As multicellular species, organisms made up of more than one cell are classified. Multicellular species, however, have not always existed. It took one billion years for a unicellular organism to emerge on the planet after the creation of the Universe. 

In fact, for approximately two billion years before the manifestation of multicellular organisms, which occurred approximately 600 million years ago, unicellular organisms existed alone on Earth.While many unicellular organisms tend to reproduce asexually, sexual reproduction is favoured by many multicellular organisms.

Following are the important examples of multicellular organisms:

a.Humans

b.Dogs

c.Cows

d.Cats

e.Chicken

f.Trees

g.Horse

h.Snakes

The essential traits of multicellular organisms are as follows:

1.Multicellular species are made up of more than one cell and are organisms that are complex.

2.To the naked eye, they are visible.

3.They possess various organs and systems of organs.They are eukaryotes, that is, they contain structures that are membrane-bound.

4.Their cells show labour differentiation.

5.With the number of cells in an organism, their size increases.

Hence, the correct answer is option (C).

Note: By cellular specialisation and division of labour, multicellular organisms are formed. In a single process, cells become productive and become dependent on other cells to conduct different processes. For the proper functioning of an organism, all the cells operate in synchronisation.