Variation in cell number, shape and size.

Question 1

Unicellular organisms

Answer 1

Organisms, made up of a single cell. ( amoeba, euglena, paramoecium )

Question 2

Multicellular organisms

Answer 2

Organisms, made up of many cells. ( humans, animals, birds )

Question 3

Why an euglena and a bird are of different sizes

Answer 3

Because euglena is an organism, made up of a single cell, whereas a bird is made up of many cells.

Question 4

The shapes of cell differs not only in different organisms, but also in _____________________________

Answer 4

different organs of the same organism

Question 5

Different cells are different in their size

Answer 5

Because of their location and function in the tissue

Question 6

nerve cells possess a long fiber-like structure

Answer 6

Because for instance, Nerve cell has to transmit nerve impulses to different organs of the body

Question 7

Smallest cell and its size

Answer 7

Pleuro pneumonia-like organism ( PPLO ) ( also called as mycoplasma). size = 0.1µ in diameter

Question 8

Biggest cell and its size

Answer 8

Ostrich’s egg. size = 170mm in diameter ( approx. )

Question 9

1µ = ?

Answer 9

1µ = 10^-6 m