 Today we are going to study about self-shape, size, number and their body. Most important is first topic, shape. Different organisms have different shape of the cells. But even in our own body, all the cells are not same. Means if all the cells are same, they will form tissue. And that tissue will form a particular organ. But if there is another organ, then there may be some another kind of arrangement of cells. Means all the cells that is present in our body are not similar. They look little different. So in order to study different shape of the cells, first example is amoeba. The body of amoeba is irregular. But what is the shape is a regular node that it is known as irregular shape. Now if we talk about our body muscle cells. The muscle cells are wider in the middle and have the tampering ends. The shape of the muscle cells is sprinkled like this. Wider in the middle and tampering ends. The third is the love cell. This is first. Second we are just considering the example. Love cell is kind of broad to the cell. And I will make the structure a little bit larger. See this is the main body cider and this is the egg cell. It is the last right structure. This is the longest cell of our body. Fourth is RBC, that is known as red blood corpuscles. From here they are overall blue shape. And of it is bone cell. The name of the bone cell is osteoside. It is somewhat star shaped in structure. And they are slightly less of branch shape. Branch shape. This is branch shape. When we talk about the shape of the cells. I have considered five example that is given in your LCRT. Amoeba is of irregular shape. Muscle cell is of spindle shape. Muscle cell is branch shaped. Then bone cell that is known as osteoside is also branch. And the RBC is it oval shape. Or you can also branch shape. This we talked about cell shape. Now the second thing which we have to study. Cell size. The size of each and every cell is not same. Study how the size of different cells vary. From one person to another person or from one person to another or another. It is cell size. The size of the cell varies from 0.5 micrometer to 20 micrometer in diameter. The normal range of the size of the cell is 0.5 micrometer to 20 micrometer. In order to understand the size of different types of cells. We can see the cell here as well as multi-cellular. First we will talk about human body. Then we will talk about plant. And then we will generally talk about which is the longest cell. And which is the smallest cell on the basis of size. Starting with human body. Now cell is the longest cell. The smallest cell is the RBC. And form of RBC is the Red Blood Copsicle. This is the smallest cell in our body. This was the case of human. Consider of plant. There is one green alga. The green is Pandorina. This alga Pandorina is the green alga Pandorina. It is the largest cell. So this is the largest cell. Now we will consider normally which is the smallest cell and which is the largest cell. So P, P and O. Mycoplasma is the smallest cell. Its size ranges from 0.1 to 0.5 micrometer in diameter. And when we talk about largest cell. Then the largest cell is the Austrian egg. Whose size ranges from 0.5 to whose size ranges up to 15 centimeter in diameter. Let me write this so that you will understand it. I mean O. It is better that we should write it here. Generally, this is known as the smallest cell of plasma. And it is also known as PPL O. The size is 0.1 to 0.5 micrometer. And the largest is the Austrian egg. 15 centimeter in diameter. Now we will discuss about cell shape. Second we discussed about cell size. And now we will talk about cell number. As we know on the basis of the number of cells, we have done the categorization of the cell into unicellular and the second is multicellular. So if it is unicellular then obviously it is clear that the number of the cell will be 1. No confusion. But if it is the case of multicellular, multicellular means more than 1. And now more than 1 means it can be anything. So if we talk about multicellular, then let us discuss first that green alga whose name is Pandorina. It contains cells from 8 to 32 in number. Number of cells is 8 to 32. In case of human beings if we talk that is our case, human being contains 60,000 billion of cells. Remember this? Number 60,000 billion of cells. Now third human fetus. It contains, instead of fetus let us write human infant that is newly born baby. 2 into 10 to the power 12 cells. Green alga, Pandorina 8 to 32 number of cells. Human beings 60,000 billion of cells. And human infant have 2 into 10 to the power 12 number of cells. So this is the category of number of the cells.