Test: Structural Organization Of Cell - Grade 9 MCQ

Cells are made of a variety of chemical substances - proteins, carbohydrates, fats or lipids and so on. Soil is not a component of  cell. 

Organelles like mitochondria and nucleus are important parts of the cell, while the cell wall is present in plant cells. Soil, however, is not a part of the cell and exists outside the living system.

Eukaryotic cells generally range in size from about 5 to 100 micrometres. These cells are typically larger than prokaryotic cells, which are usually smaller (ranging from 1 to 10 micrometres).

• Option A is correct as it is within the typical size range of eukaryotic cells.
• Other options refer to measurements in nanometres, which are much smaller than the size of typical eukaryotic cells.

Therefore, the correct answer is A: 5-100 micrometre.

The term used to describe the entire content of a living cell, including the cytoplasm and the nucleus, is "protoplasm." Protoplasm is often referred to as the living substance of the cell.

Animal cells do not have cell Wall because they do not need them. Cell walls , which are found in plant cells , maintain cell shape, almost as if each cell has its own exoskeleton.

Unicellular organisms are made up of only one cell that carries out all the functions needed by the organism, while multicellular organisms use many different cells to function. Multicellular organisms are composed of more than one cell, with groups of cells differentiating to take on specialized functions

A: Cell wall → Correct. Present only in plant cells. It provides rigidity and structural support. Animal cells lack a cell wall.

B: Nucleus → Incorrect. Both plant and animal cells have a nucleus that controls cell activities.

C: Cytoplasm → Incorrect. Both plant and animal cells have cytoplasm where organelles are suspended.

D: Mitochondria → Incorrect. Both plant and animal cells contain mitochondria, the powerhouse of the cell.

Most prokaryotes contain one circular chromosome. DNA communicateswith the cytoplasm- so it allows direct connection to the transcription and translation. Contain only one copy of the gene. Non essential genes are stored outside of chromosome - in Plasmids.

In order for cells to function and survive, their organelles work together to carry out specific tasks and perform specific roles. Each organelle has its own role that contributes to the survival of the cell. This is called thr Division of labour. 

Chromosomes are thread-like structures located inside the nucleus of the cell. They carry genetic information in the form of DNA. Chromosomes are not found inside mitochondria, are not made only of proteins, and are present in both plant and animal cells. Therefore, option b is the correct answer.