Learn Class 9 Science - Cell-The Fundamental Unit of Life

When we see any living organisms in the world, they are made of cells. Whether there is a single cell or a type of multicellular cell, they perform their functions. The term cells refer to the unit's structure present in the living organisms. These are the cells that are made with pre-existing cells.

Organisms

The organisms are classified into two parts: unicellular organisms and multicellular organisms.

1. Unicellular organisms

  • Unicellular organisms are organisms that are made of single cells.
  • Unicellular organisms are organisms that are made of single cells.

2. Multicellular organisms

  • Multicellular organisms are organisms that are made of different parts of cells.
  • These cells form the different parts and functions of the organism.
  • Example: Fungi, animals.

Cell's shape

  • The cell's shape is very different as it depends on the function type it is made of. And each shape of the cell will perform various functions.
  • Example: WBC (White Blood Cells) or Amoeba.

Elements of cell

The cell comprises three different components: the plasma membrane, nucleus, and cytoplasm. These are discussed below:

  • The plasma membrane is an envelope type that covers the whole cell parts.
  • The cell will get separated from the external environment due to the plasma membrane.

Learning Videos for 9th Grade Science - Cell-The Fundamental Unit of Life

Cell-The Fundamental Unit of Life Sample Questions for Class 9

Question 1

How do prokaryotic cells differ from eukaryotic cells?
A. Prokaryotic cells do not have a nucleus.
B. Prokaryotic cells are much larger in size and width.
C. Prokaryotic cells contain mitochondria.
D. Prokaryotic cells have a less distinct shape in comparison to eukaryotic cells.

Question 2

What is the most basic unit of life?
A. cell
B. organ
C. organelle
D. tissue

Question 3

Which cell organelle plays the role of generating proteins?
A. ribosomes
B. nucleoli
C. mitochondria
D. chloroplasts

Question 4

Which structure is made up of fats and proteins and surrounds a cell?
A. plasma membrane
B. cell wall
C. cell envelope
D. cytoplasm

Question 5

What fundamental unit makes up all living things?
A. cells
B. tissue
C. bones
D. organs