1. Give 5 examples of single celled organisms. 2. What are multicellular organisms? Give an example. 3. What would happen if the plasma membrane ruptures or breaks down? 4. What is a semi permeable membrane? What are the differences between semi permeable membrane and selectively permeable membrane? 5. State the primary functions of plasma membranes.
Answers
Answer:
1. Who discovered cells and how?
Answer- Cell was discovered by an English Botanist, Robert Hooke in 1665. He used self-designed microscope to observe cells in a cork slice back then.
2. Why the cell is called the structural and functional unit of life?
Answer- Cells are called the structural and functional unit of life because all the living organisms are made up of cells and all the functions that take place inside the organisms are performed by cells.
Answer:
1. Five examples of single celled organisms are:
prokaryotes.
protists.
fungi.
bacteria.
archaea.
2.Multicellular organisms are organisms that consist of more than one cell, in contrast to unicellular organisms.
Few examples of multicellular organisms are:
human beings, plants, animals, birds, etc
3.If the plasma membrane ruptures or breaks down then the cell will not be able to exchange material from its surrounding by diffusion or osmosis. Thereafter the protoplasmic material will disappear and the cell will die.
4.The diffusion of water through a
permeable membrane is called osmosis.
5.The plasma membrane, or the cell membrane, provides protection for a cell. It also provides a fixed environment inside the cell. And that membrane has several different functions. One is to transport nutrients into the cell and also to transport toxic substances out of the cell.