Biology, asked by krishgarg16400, 11 months ago

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Answered by zainanasrullah
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1. The cell is called the structural and functional unit of life as all living organisms are made up of cells.Furthermore, cells provide form and structure, process nutrients and convert it into useable energy. Multicellular organisms have specialized cells that perform specific functions.

2.Amoebas are characterized by their flowing movements, considered to be the most primitive form of animal locomotion, or movement. Some are well-known parasites of plants, animals, and humans. It should be noted that amoeba are not animals; however, they are classified in the protist kingdom.

Plant cells have cell walls, constructed outside the cell membrane and composed of cellulose, hemicelluloses, and pectin. Their composition contrasts with the cell walls of fungi, which are made of chitin, of bacteria, which are made of peptidoglycan and of archaea, which are made of pseudopeptidoglycan.

Like the cells of all eukaryotes, animal cells have a nucleus and other membrane-bound organelles (see Figure below). Unlike the cells of plants and fungi, animal cells lack a cell wall. This gives animal cells flexibility. It lets them take on different shapes so they can become specialized to do particular jobs.

3.Fully-grown adults are much larger in size than young children. What happens to the cells of the body during the growth of a child? The cells of a growing child divide to make more cells, and those cells are each half the size as the cells were before they divided. The cells do not grow before they divide again.

4.Bigger animals have a larger number of cells than a smaller animal. But the cells of similar nature are of similar size. People have different types of cells in different parts. ... Huge persons carry a larger number of cells than a person of smaller size.

5.(a) Mycoplasmas

(b)egg cell of ostrich

(c)sperm

(d)nerve cell

6.Examples of Unicellular Organisms

Some of the examples of unicellular organisms are:

Amoeba

Euglena

Paramecium

Plasmodium

Nostoc, Salmonella ( Prokaryotic unicellular organisms)

Protozoans, Fungi, Algae ( Eukaryotic unicellular organisms)

Multicellular Organisms Examples

Some of the examples of multicellular organisms are listed below:

All vertebrates and invertebrates

All angiosperms, gymnosperms and higher land plant

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