Question

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Answer 1

• number of cells in uni cellular organisms is just one, but in multi cellular organisms there are many
• in uni cellular organisms, most of the work is done in the cytoplasm whereas the multi cellular organisms have organelles
• uni cellular organisms divide by binary fission and multicellular organisms reproduce when the gametes fuse
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Answer 2

1. unlike a multicellular organism that consists of more than one cell. Unicellular organisms fall into two general categories: prokaryotic organisms and eukaryotic organisms.

2.As in higher organisms division of labour takes place among different organs, in unicellular organisms several cell organelles like mitochondria, ribosome etc perform different function. Division of labour takes place among cell organelles in unicellular organism. For example, mitochondria are responsible for respiration, contractile vacuoles act as digestive system, lysosome as excretory system etc.

All these cells perform specific functions. ... Hence, a particular function is carried out by a group of cells at a definite place in the body. Similarly, different functions are carried out by different groups of cells in an organism and this is known as division of labour in multicellular organisms.

3.Single-celled organisms which use asexual reproduction can do so very rapidly simply by dividing into two equal halves. This is called binary fission. In yeasts the cell does not divide equally in two halves; instead, there is a large mother cell and a smaller daughter cell. This is called budding.

Multicellular Organisms Development. While all consist of more than one cell, they start out as a single cell. The cell proliferates to produce many more cells that result in the multicellular organism. The process starts with a single fertilized cell that increasingly divides to form many more cells.