1. With the help of a neat and well-labelled diagram, differentiate between plant and
animal cells.
2. Who proposed the cell theory?
What are its postulates?
3. How did Robert Hooke discover cells?
4. Explain the process of cell division
5. List all the cell organelles and describe their functions.
6. Why are lysosomes called the suicidal bags of the cell?
Answers
Answer:
What is this incredible object? Would it surprise you to learn that it is a human cell? The cell is actually too small to see with the unaided eye. It is visible here in such detail because it is being viewed with a very powerful microscope. Cells may be small in size, but they are extremely important for life. Like all other living things, you are made of cells. Cells are the basis of life, and without cells, life as we know it would not exist. You will learn more about these amazing building blocks of life when you read this section.
Discovery of Cells
The first time the word cell was used to refer to these tiny units of life was in 1665 by a British scientist named Robert Hooke. Hooke was one of the earliest scientists to study living things under a microscope. The microscopes of his day were not very strong, but Hooke was still able to make an important discovery. When he looked at a thin slice of cork under his microscope, he was surprised to see what looked like a honeycomb. Hooke made the drawing in the figure below to show what he saw. As you can see, the cork was made up of many tiny units, which Hooke called cells.
Soon after Robert Hooke discovered cells in cork, Anton van Leeuwenhoek in Holland made other important discoveries using a microscope. Leeuwenhoek made his own microscope lenses, and he was so good at it that his microscope was more powerful than other microscopes of his day. In fact, Leeuwenhoek’s microscope was almost as strong as modern light microscopes. Using his microscope, Leeuwenhoek was the first person to observe human cells and bacteria
a microscope when he happened to see them dividing and forming new cells. He realized that living cells produce new cells through division. Based on this realization, Virchow proposed that living cells arise only from other living cells.
The ideas of all three scientists — Schwann, Schleiden, and Virchow — led to cell theory, which is one of the fundamental theories unifying all of biology. Cell theory states that:
All organisms are made of one or more cells.
All the life functions of organisms occur within cells.
All cells come from already existing
Explanation:
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Explanation:
the cell theory was proposed by botanist Matthias Schleiden and zoologist Theodor Schwann....
by observing them through simple microscope
2 phases
i.e interphase and mitotic phase...in interphase the cell synthesis of RNA proteins and duplication of DNA takes place....in mitotic phase the cell divides...2steps again ie karyokines (division of nucleus) and cytokinesis (division of cytoplasm)
the lysozomes r suicide bags of the cell those swallow up any foreign material and and kills the infected cells and digests it off...