Biology - structure and functions of animal and plant matters (6th lesson)

Question 1

who observed cells for the 1st time?

Answer 1

Robert Hooke
he obsevered a cork using a microscope he invented by him and saw structures like chambers ang heevies and decided to name them cells

Question 2

who invented the cell theory

Answer 2

Schleiden
Schwann
Radolf Virchow

Question 3

What is the cell theory?

Answer 3

• structural and functional unit of life is cell
• all organisms are made up of one or more cells
• new cells are formed form pre exsisting cells

Question 4

wht is the smallest structural unit in living body

Answer 4

cell

Question 5

define unicellular and multicellular organisms ?

Answer 5

unicellular - organisms made up of single cell

Multicellular - organisms made up of many cells

Question 6

wht are organelles ?

Answer 6

The smallest structures present in cell to perform different functions are known as organelles

Question 7

what is a typical cell

Answer 7

a cell prepared by including all organelles is knwn as a typical cell. ( such cells does not exist) but cells with a certain number of organelles can be found

Question 8

wht are the differences between animal cell and plant cell

Answer 8

ANIMAL CELL

Question 9

wht are the differences between animal cell and plant cell

Answer 9

ANIMAL CELL - PLANT CELL

*cell wall present - *cell wall absent
*contains a lot of cytoplasm - *cytoplasm is pushed towards
periphery
* a large vacuole is absent - * a large vacuole or a few small
vacuoles may present
*chloroplasts absent - * chloroplasts present

Question 10

cell wall?

Answer 10

*main constituent of cell wall is cellulose
*its a dead structure
*MAIN FUNCTION = maintain shape of the cell, support and
protection