KSEEB Solutions for Class 9 Science Chapter 5 The Fundamental Unit of Life

Students can Download Science Chapter 5 The Fundamental Unit of Life Questions and Answers, Notes Pdf, KSEEB Solutions for Class 9 Science helps you to revise the complete Karnataka State Board Syllabus and to clear all their doubts, score well in final exams.

Karnataka State Syllabus Class 9 Science Chapter 5 The Fundamental Unit of Life

KSEEB Class 9 Science The Fundamental Unit of Life Intext Questions and Answers

Question 1.
Who discovered cells and how?
Answer :
It is a Latin word that means “little room” discovered by Robert Hooke in 1965 by observing the bark of a tree that has a similar structure as that of honeycomb.

Question 2.
Why is the cell called the structural and functional unit of life?
Answer :
Each living cell has the capacity to perform certain functions and the cell does perform different functions in different parts.

Question 3.
How do substances like CO₂ and water move in and out of the cell? Discuss.
Answer :
The process of diffusion makes CO₂ move in and O₂ excretes by the plants and in animals, it is vice versa due to the difference in concentration the water molecules move through the selectively permeable membrane is called osmosis. It is the passage of water from a region high water concentration through a semi-permeable membrane to a region of low water concentration.

Question 4.
Why is the plasma membrane called a selectively permeable membrane?
Answer:
It allows the essential nutrients required by the cell to establish the normal activities of the cell.

Question 5.
Fill in the gaps in the following table illustrating differences between prokaryotic and eukaryotic cells.
Answer:

Prokaryotic cell	Eukaryotic cell
Size : generally small (1-10 pm)	Size : generally large (5-100gm)
Nuclear region: is bounded and known as nudged.	Nuclear region: well defined and surrounded by a nuclear membrane.
Chromosome: single	More than one chromosome
Membrane-bound cell organelles absent.	Well established.

Question 6.
Can you name the two organelles we have studied that contain their own genetic material?
Answer :
(a) Nucleus (Chromosomes)
(b) Chromatin

Question 7.
If the organization of a cell is destroyed due to some physical or chemical influence. What will happen?
Answer :
The specific function of the cell is hampered and affects the continuous chain of metabolic activities.

Question 8.
Why are lysosomes known as suicide bags?
Answer :
When the cell gets damaged lysosomes may burst and the enzymes digest their own cell.

Question 9.
Where are proteins synthesized, inside the cell?
Answer :
Endoplasmic reticulum.

KSEEB Class 9 Science The Fundamental Unit of Life Textbook Exercise Questions and Answers

Question 1.
Make a comparison and write down ways in which plant cells are different from animal cells.
Answer :

Plant cell	Animal cell
Contain chloroplast.	Do not contain chloroplast
Vacuoles are large.	Vacuoles are small.
The cell wall is composed of cellulose.	Composed of coll membrane

Question 2.
How is a prokaryotic cell different from a eukaryotic cell?
Answer :

Prokaryotic cell	Eukaryotic cell
1. Size of the cell is 1 td 10 μm (1 μm = 10-6 m)	Size generally large (5 – 100 μm)
2. A chromosome is single.	Chromosome arc more.
3. Membrane-bound cell organelles absent.	Cell organelles are present.
4. The nuclear region is not definite.	The nuclear region is well defined

Question 3.
What would happen if the plasma membrane ruptures or breaks I down?
Answer :
Selective absorption and inclusions are not taken place and organelles are effected.

Question 4.
What would happen to the life of a cell if there was no Golgi apparatus?
Answer :
Cells do not have storages modification and package products is vesicles and also do not form the Golgi apparatus.

Question 5.
Which organelle is known as the powerhouse of the cell? Why?
Answer :
Mitochondria: The energy required for various chemical activities needed for life is released by it in the form of ATP (Adenosine triphosphate)

Question 6.
Where do the lipids and proteins constituting the cell membrane get synthesized?
Answer :
The endoplasmic reticulum, Mitochondria

Question 7.
how does an Amoeba obtain its food?
Answer :
Amoeba having charging shapes and cell inclusions through which prey is in wording into the cellular inclusions.

Question 8.
What is osmosis?
Answer :
The Movement of molecules through the selectively permeable membrane is called osmosis.

Question 9.
Carry out the following osmosis experiment:
Take four peeled potato halves and scoop each one out to make potato cups. One of these potato cups should be made from a boiled potato. Put each potato cup in a trough containing water. Now,
(a) Keep cup A empty
(b) Put one teaspoon sugar in cup B
(c) Put one teaspoon salt in cup C
(d) Put one teaspoon sugar in the boiled potato cup D.

Keep these for two hours. Then observe the four potato cups and answer the following:
(i) Explain why water gathers in the hollowed portion of B and C.
(ii) Why is potato A necessary for this experiment?
(iii) Explain why water does not gather in the hollowed-out portions of A and D.
Answer :
(i) To show the increase in the level of water.
(ii) Permeable membrane
(iii) Difference in the concentration of the solution.

KSEEB Class 9 Science The Fundamental Unit of Life Additional Questions and Answers

Question 1.
Name the powerhouse of the cell?
Answer :
Mitochondria

Question 2.
What is Biogenesis?
Answer :
Some of the proteins and lipids help in building the cell membrane this process is called biogenesis.

Question 3.
Expand
(i) DNA
(ii) RNA.
Answer :
(i) DNA – Deoxyribonucleic acid
(ii) RNA – Ribonucleic acid

Question 4.
Define stroma.
Answer :
The internal organization of the plastids consists of numerous membrane layers embedded in a material called the stroma.

Question 5.
Define osmosis.
Answer :
Passage of water from a region of higher to lower concentration through a semi-permeable membrane.