Question

Robert Hooke discovered the _________ of a cell.
A. Cell membrane
B. Nucleus
C. Cell wall
D. Cytoplasm

Answer 1

Hint: Cell theory emphasizes the unity in the diversity forms. It is an organization of life forms. All living organisms have a basic unit called a cell. All organisms are composed of cells. Some are composed of a single cell and are called unicellular organisms while others are composed of multicellular organisms. Cells carry out physiological processes like digestion, excretion, memory, defense, recognition etc.

Complete answer:
Option A) cell membrane- Anton Van Leeuwenhoek first saw and described a live cell. He was the scientist who first discovered free-living algae spirogyra cells in pond water in \[1674\]. He observed the cells in an improved electron microscope which he revealed all the structural details of the cell.
Option A is not correct.
Option B) nucleus- Nucleus was discovered by Robert Brown in \[1831\] in a cell. Nucleus is enclosed in a nuclear envelope. It contains the most important material called chromosomes which contain DNA which are vital for transferring genetic information.
Option B is not correct.
Option C) cell wall- cell wall is discovered by Robert Hooke in \[1665\]. Cell wall is the outermost protective layer of a cell which protects the cell components from any damage.
Option C is correct.
Option D) cytoplasm- Cytoplasm is the gelatinous liquid that is filled inside of a cell. It is composed of salts, water and inorganic molecules. The organs are placed inside the cell separate from the cytoplasm.
Option D is not correct.

Hence, Option C) is the correct answer.

Note:
the theory of cells proposed by two well-known scientists. They have discovered many things and their contribution is major in cell theory and they got many awards for their contribution. As their publications were published, they gained recognition in the field of cell biology. It is still one of the greatest discoveries in the biological world. As, cells possess the center of life. A life can be evolved, multiplying from a tiny single cell. Hence it is the greatest discovery so far known.