Question

Which cell structure controls all the activities in the cell?
A. Chloroplast
B. Cytoplasm
C. Nucleus
D. Vacuole

Answer 1

Hint: A cell consists of some sub-cellular components called cell-organelles. Besides all other such organelles, the nucleus is the most important. It contains the genetic material. Cell organelles, a specialized entity which is present inside a particular type of cell performs a specific function.

Complete answer:
In a cell, there are different cell organelles. Some of these are present in all cell types, such as cell membranes, nuclei, and cytoplasm, while some organelles are unique in plant cells like plastids and cell walls. The nucleus is the cell's largest and most substantial living organelle. The nucleus regulates all cell activities of the cell. It is also called the cell's brain or control centre. Karyokinesis is known as the division of the nucleus during cell division. Using the DNA's genetic information, the nucleus regulates all the cell's functions, such as growth and metabolism. A smaller structure called the nucleolus is present within the nucleus. The cell membrane also called the plasma membrane is composed of lipids and proteins, where the composition might fluctuate based on external environment, fluidity and several other stages of cell development.

So, the correct answer is option C.

Note: The cell is of two types: prokaryotic and eukaryotic. Prokaryotic cells are primitive cells, whereas eukaryotic cells are modern cells. Both of the types differ in size, i.e. prokaryotes are smaller than eukaryotes. The cell was first discovered by Robert Hooke in 1665.