Chapter 1 Cell : The Unit Of Life

Question 1

Who discovered dead cell and living cell?

Answer 1

Dead cell was discovered by Robert hooke .basically he discovered cell wall in slice of cork and living cell was discovered by anton von leeuwenhoek.he is also known as ‘father of microbiology’.

Question 2

Scheilden

Answer 2

He stated that all PLANTS are made up of small repeating units called cells in 1838.

Question 3

Schwann

Answer 3

He stated that all ANIMALS are made up of cells and their products having a thin membrane lacking cell wall in 1839.

Question 4

Cell lineage theory

Answer 4

It was given by rudolf virchow. He stated ‘omnis-cellula -e- cellula’ meant all new cells form from old existing cell.

Question 5

Cyclosis

Answer 5

It is also known as bryonium movement,cytoplasmic streaming.it occurs due to presence of cytoskeleton.that’s why it occurs in eukaryotes not in prokaryotes.

Question 6

Smallest living cell

Answer 6

PPLO (pleuro pneumonia like organisms)

i.e.mycoplasma.

Question 7

Sizes of cell

Answer 7

Virus = 0.02 um to 0.2 um
RBC= 7 um
Typical animal cell = 10-20 um
Largest cell = ostrich egg (12 -15 cm/ 15-18cm)
Mycoplasma = 0.03 um
Bacteria = 1-3 um (3-5um)