Explain various types of organisms on the basis of number of cells.
There are two types of organisms on the basis of number of cells:
(i) Unicellular : The organisms contain only single cell in the body are called unicellular organisms. For example : amoeba and paramecium.
(ii) Multicellular : The organisms made up of more than one cells, are called multicellular organisms. For example human, tree, dog, etc.
What is an organ system?
(a) Give two examples of organ systems in animals.
(b) Name the two main organ systems in plants.
In the organisation of a cell is destroyed due to some physical or chemical influence, what will happen?
Why is the plasma membrane called a selectively permeable membrane?
A, B, C and D are basic parts of all the cells. The part A contains thread like structures called E which transfer the characteristics from parents to their offsprings into the cell and out of the cell. The part B provides energy to the cell. The part C is found in plant cell but not in animal cell. The part D is a transparent, jelley–like material. What could A, B, C, D and E be?
