Exam (elaborations)
Test (elaborations) Maths trigonometry rd Sharma practice class 10
- Course
- Institution
Practice class maths chapter and sciences and science class maths trigonometry question
[Show more]
Seller
Follow
jitenderkumarjitender
Content preview
CLASS 9th NOTESSCIENCE
FUNDAMENTAL UNIT OF LIFE:CELL
PRASHANT KIRAD
, PRASHANT KIRAD
FUNDAMENTAL UNIT OF LIFE: CELL
Cell:
It is known as the structural and fundamental unit of life because it
is the basic building unit of an organism and is capable to perform
basic functions of all living organisms.
Cytology is the scientific study dedicated to understanding the
structure and composition of cells.
In 1665, Robert Hooke first observed cells in a thin slice of cork,
marking the beginning of our understanding of cellular existence.
A. V. Leeuwenhoek, in 1674, made the groundbreaking discovery of
the first free-living cell.
Protoplasm, the essential substance within cells, comprises water,
ions, salts, organic molecules, cell organelles, and a nucleus, existing
in sol-gel states. 10
Discovery of Living Cell Anton Van Leeuwenhock (1674)
&
Discovery of Nucleus Robert Brown (1831)
9
Discovery of Protoplasm J. E. Purkinje (1839)
B
U
Cell Theory:
PH
The cell theory was given by Schleiden and Schwann, in 1838 which
EX
states that:
1. All living things are made up of cells.
2. The cell is the basic unit of structure and function in living
organisms.
3. Cells come from pre-existing cells through the process of cell
division.
onion peel cell
, PRASHANT KIRAD
Types of Cells and Organisms
On basis of number of cells:
On the basis of number of cells, organisms are divided into two
categories: 10
&
9
B
U
PH
EX
On the basis of type of organizational cells:
1. Prokaryotic Cells
2. Eukaryotic Cells
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through EFT, credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying this summary from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller jitenderkumarjitender. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy this summary for R190,93. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
82388 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy summaries for 14 years now