Name the scientist who coined the term "cell". How many lenses did he use in his microscope? What did he observe under his microscope?

Name the three essential parts of the cell. Briefly describe the structure of cell membrane.

The diagram given alongside represents a certain kind of cells found in humans. Study the same and answer the following questions.

1. Identify the kind of cells.
2. Label the guidelines 1 to 3.
3. Which of the above labelled part regulates and coordinates the various life processes of the cell ?
4. If we were to prepare a slide of the cells shown above, what stain will we use in order to clearly see the cells ?
5. How many chromosomes are found in the part shown as 2 ?

The diagram given alongside represents a cell. Study the same and answer the following questions :

1. Is it a plant cell or an animal cell ? Give reason in support of your answer.
2. Label the guidelines 1 to 8.
3. Name one structure shown in the figure which is found in both plant and animal cells, but with different sizes.
4. What is the protective membranous covering of the part shown as 4 called ?
5. Name any two organelles.