NCERT Solutions For Class 9 Science Chapter 5: The Fundamental Unit of Life

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The NCERT Solutions for Class 9 Science Chapter 5 : The Fundamental Unit Of Life are included in this article. Some of the important concepts of Class 9 Chapter 5 The Fundamental Unit of Life are:

Difference Between Cytosol and Cytoplasm
Osmosis
Diffusion

Download: NCERT Solutions for Class 9 Science Chapter 5 pdf

NCERT Solutions for Class 9 Science Chapter 5

NCERT Solutions class 9 science chapter 5

Important Topics for Class 9 Science Chapter 5 The Fundamental Unit of Life

Fundamental unit of life (cells) are the basic fundamental unit of life. Cells are a basic unit of structure and function in life. Cells are broadly classified into plant and animal cells. Each cell has organelles that help them to perform certain functions. Several cells can work together to form tissues and organs.

Difference Between Cytosol and Cytoplasm

Cytosol can be defined as the cellular component present within the cytoplasm and often known as the matrix of the cytoplasm. While, Cytoplasm refers to the intracellular fluid surrouded by the cell membrane in the cell. Cytosol is basically a component of the Cytoplasm.

Example: Cytoplasm and cytosol are biologically the same. Comment yes or no. Justify the statement if no.

Solution: No, Cytoplasm and Cytosol are not the same biologically. Cytoplasm refers to the thick, viscous solution surrouded by the cell membrane, holding all the cell organelles except the nucleus. While, Cytosol is the cellular component usually found within the cytoplasm. It is responsible for performing various metabolic activities. They are often used interchangeably but are not the same biologically.

Osmosis

Osmosis can be defined as a spontaneous movement solvent particles through a semipermeable membrane usually to the low concentration of the given solution from the high concentration of the given solution.

The two types of Osmosis are:

Endosmosis: Endosmosis usually comprises the usage of hypotonic solution.
Exosmosis: Exosmosis comprises the usage of hypertonic solution.

Diffusion

Diffusion refers to the movement of molecular level particles from a given higher concentration to a particular region of lower concentration. Diffusion is otherwise also called the mode of passive transportation.

Example: List two important points of Diffusion.

Solution: Two important points of Diffusion include:

Diffusion is responsible to keep the inside of plant tissues' cell walls consistently moist.
Diffusion is a go-to for ions and various other chemicals to spread throughout the protoplast.

Also Check:

Chapter Related Links
Multicellular Organisms	Unicellular Organisms	Plasma Membrane
Difference Between Cytoplasm and Protoplasm	Mitochondria	Difference Between Mitochondria and Chloroplast
Nuclear Membrane	Endoplasmic Reticulum	Prokaryotic and Eukaryotic Cells
Cell Biology	Discovery of Cells	Difference between Cell and Tissue

Also Read:

Important Science Study Guides
Periodic Table	Physics Constants	Difference between in biology
Difference between in chemistry	Difference between in physics	Named Reactions

CBSE X Related Questions

1.
Assertion (A): Reflex actions do not involve thinking.
Reason (R): Most reflex actions are controlled by the spinal cord.
- Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
- Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
- Assertion (A) is true, but Reason (R) is false.
- Assertion (A) is false, but Reason (R) is true.
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2.
(a) Study the given electric circuit in which 2 A electric current is flowing between points X and Y.

(i) Using the battery, key, voltmeter and ammeter in this given electric circuit, redraw a circuit diagram in which 2 \(\Omega\) and 4 \(\Omega\) resistors are connected between X and Y in parallel combination.
(ii) Circuit drawn by you, in which resistors are connected in parallel combination, calculate the electric current flowing through 4 \(\Omega\) resistor.
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3.
Sex is determined by different factors in various species. However, in human beings, it is determined genetically. Which amongst the following option(s) is/are correct for human beings ?
Gamete carrying X chromosome from female parent.
Gamete carrying X chromosome from male parent.
Gamete carrying Y chromosome from male parent.
- (ii) and (iii)
- (i) only
- (i) and (iii)
- (iii) only
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4.
How many bulbs of resistance \( 8 \ \Omega \) each should be connected in parallel combination to draw a current of \( 2 \text{ A} \) from a battery of \( 4 \text{ V} \) ?
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5.
Which of the plant hormones are responsible for the following processes? Promote cell division Inhibition of growth Detection of light Wilting of leaves
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6.
When an element 'X' reacts with water, it starts floating. Identify the element 'X':
- Potassium
- Calcium
- Sodium
- Iron
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