15 Questions
Who discovered the smallest functional unit of life?
Robert Hooke
Which scientist is known for his work on genetics and heredity?
Gregor Mendel
What is the basic unit of life?
Cell
What is the outermost covering of a cell called?
Plasma membrane
What are the two types of cells mentioned in the text?
Plant cell and Animal cell
Which process describes the movement of water from a region of high water concentration to a region of low water concentration through a semi-permeable membrane?
Osmosis
What is the main component of the plant cell wall that provides structural strength?
Cellulose
Which organelle plays a central role in cellular reproduction and contains visible rod-shaped structures called chromosomes?
Nucleus
What is the term for the phenomenon where there is shrinkage or contraction of the contents of a living plant cell away from the cell wall due to loss of water through osmosis?
Plasmolysis
What is the process by which the cell membrane engulfs food and other materials from its external environment, as observed in Amoeba?
Endocytosis
Which of the following substances can move across the cell membrane by a process called osmosis?
Water
In a hypotonic solution, what happens to the cell?
It gains water
What is the main component of the plant cell wall that provides structural strength to plant cells?
Cellulose
What is the term for the phenomenon where there is shrinkage or contraction of the contents of a living plant cell away from the cell wall due to loss of water through osmosis?
Plasmolysis
What are functional segments of DNA called?
Genes
Study Notes
The Fundamental Unit of Life
- The smallest functional unit of life is a cell, discovered by Robert Hooke in 1665.
- A cell can independently perform all necessary activities to sustain life, making it the basic unit of life.
Types of Cells
- There are two main types of cells: plant cells and animal cells.
Cell Organelles and Their Functions
- Plasma/Cell membrane: the outermost covering of the cell that separates the contents of the cell from its external environment.
Get complete notes for Chapter 5: The Fundamental Unit of Life from the NCERT textbook for Class 9 Science. Enhance your understanding with NCERT Solutions for the same chapter. Perfect for students looking to reinforce their knowledge.
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