Free The Fundamental Unit of Life 01 Practice Test - 9th Grade 

Question 1

Why is cell membrane called a selectively permeable membrane?

A. It is permeable only during certain stage of the cell division.
B. It allows only selective molecules to pass through it.
C. It allows only water to pass.
D. It is made up of lipids.

SOLUTION

Solution : B

Plasma membrane is an external covering of the cell. It separates the contents of the cell from the external surroundings. Since, it allows the entry and exit of only certain substances (e.g., molecules, ions, etc.) it is known as a selectively permeable membrane. 

Question 2

Robert Hooke was the first person who saw cells using a microscope. Which among the following options is/are true about his observation?

A.

He observed the cork cells dividing.

B.

He observed organelles like chloroplasts and mitochondria in cork cells.

C.

He observed the dead cells of cork.

D. He discovered the nucleus in the cell.

SOLUTION

Solution : C

In the year 1665, Robert Hooke observed cork cells under the microscope.​ Hooke saw cell walls in cork tissue and coined the term 'cells' for them, as the box-like compartments of cork reminded him of the cells of a monastery. Cell is a Latin word for ‘a little room’.

Question 3

Unlike the division of labour seen in the multicellular organisms, there is no division of labour within a single cell.

A.

True

B.

False

SOLUTION

Solution : B

The fundamental unit of life - cell, exhibits a fine division of labour within itself. Cellular organelles are designated to perform specific functions responsible for the normal metabolism of the cell, such as making new material in the cell, clearing up the waste material from the cell and so on.

Question 4



Identify the cell organelle.

A.

Plastid

B. Golgi apparatus
C.

Mitochondrion

D.

Lysosome

SOLUTION

Solution : C

The organelle depicted in the given image is a mitochondrion. It is a double-membraned organelle with its own genetic material. Since it is involved in the production of energy-rich ATP (Adenosine triphopshate), it is also known as the "powerhouse of the cell".

Question 5

Which among the following cell organelles are double membraned?

A. Lysosomes
B. Chloroplasts
C. Mitochondria 
D. Golgi apparatus

SOLUTION

Solution : B and C

  ∙ Mitochondria consists of an outer membrane and an inner membrane. The inner membrane shows many infoldings, known as cristae.
  ∙ Chloroplasts also have a double membrane like mitochondria, but no cristae.
  ∙ Lysosomes and golgi apparatus on the other hand, are single membrane bound cell organelles.

Question 6

Which among the following statements are correct regarding vacuoles?

A. Vacuoles are not membrane bound.
B. Vacuoles are present only in plant cells.
C. Vacuoles occupy 50-90% of the cell volume in plant cells.
D. In amoeba, food vacuoles digests food.

SOLUTION

Solution : C and D

  • Vacuoles are single-membrane bound, fluid filled spaces. They are present in the cytoplasm of the cell. 
  • Vacuoles are present in both plant and animal cell. In animal cells they are smaller in size and lesser in number.
  • Plant cells on the other hand have one large vacuole which may occupy 50-90% of the cell volume. 
  • In amoeba, the food vacuole contains the food items which the organism consumes. In some unicellular organisms, specialised vacuoles also play important role in expelling excess water and some wastes from the cell. 

Question 7

The primary function of leucoplasts is ___ .

SOLUTION

Solution :

Leucoplasts are the white or colourless plastids. They are the primary organelles for storage of materials such as starch, oils, protein granules, etc.
Example: Leucoplasts are found in root cells, pulses, groundnut, etc.

Question 8

Mitochondria are able to make their own proteins.

A. True
B. False

SOLUTION

Solution : A

Mitochondria are specialised cell organelles which serve as batteries, powering various functions of the cell and an organism as a whole.
They have their own genetic material and ribosomes which helps in synthesising proteins. 

Question 9

RER is rough due to the presence of _______ .

A. ribosomes
B. lysosomes
C. DNA
D. lipids

SOLUTION

Solution : A

Ribosomes, which are responsible for protein synthesis, are attached to the surface of rough endoplasmic reticulum (RER). Hence, RER appears to have a rough surface and is associated with protein synthesis.

Question 10

What are the cellular flattened sacs, discovered by Camillo Golgi?

A. Plastid
B. Mitochondria
C. Golgi apparatus
D. Endoplasmic reticulum 

SOLUTION

Solution : C

The Golgi apparatus was first described by Camillo Golgi, who is renowned for his work on the nervous system.
He described the golgi apparatus as an organelle consisting of a system of membrane-bound vesicles arranged approximately parallel to each other in stacks called cisternae.
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