Protazoa

Question 1

Protozoa are _____ _______ organisms

Answer 1

Protozoa are eukaryotic uniceullular organisms

Question 2

Name the 3 different vacuoles found within a prozoan cell

Answer 2

Food vacuoles, secretory vacuoles and contraction vacuoles.

Question 3

Name and describe the functions of protzoan nuclei

Answer 3

Micronucleus - The smaller nucleus is diploid and involved in genetic recombination during reproduction and regeneration of the macronucleus.

Macronucleus - The larger nucleus controls everyday functions of the cell. It is concerned with trophic activities i.e it reacts to stimuli and regeneration

Question 4

Explain cysts in relation to protazoa

Answer 4

Cysts can be distinguished by the presence of a cell wall and low metabolic activity. They are a dormant form of the protazoa, formed in reaction to adverse enviromental conditions. They are sights of cell divison and nucelar reorganization and can transfer between hosts in parasitic species

Question 5

Explain the term pellicle

Answer 5

Pellicle refers to the cell membrane and the thin layer of material beneath the cell membrane which provide the form and shape of the protazoa

Question 6

Explain the difference between protazoan endoplasm and protazoan ectoplasm

Answer 6

The endoplasm is the central part of the protazoan whilst the ectoplasm is a semi-fliud superficial layer around the protazoan granting rigidity to the cell.

Question 7

Describe 3 organelles which can grant locomotion to a protazoa.

Answer 7

Flagella - are long filamentous whip like strucutre composed of microtubules
Cilia - Short, hair like structures which are numerous and arranged in rows
Pseudopodia - Temporary extensions of the cell membrane and cytoplasm formed by the streaming of ectoplsm and endoplasm. They can attach and dettach from surfaces to allow the cell to move

Question 8

By which process to ameboza reproduce

Answer 8

Binary fission

Question 9

By which process do euglenazoa reproduce

Answer 9

Longitudinal binary fission

Question 10

By which process do cilliates reproduce

Answer 10

Asexually by transverse binary fission and sexually by conjugation

Question 11

Which organisms have complex life cycles with alternating asexual and sexual stages.

Answer 11

Sporozoa

Question 12

A protazoa that can inhabit the human body

Answer 12

Toxoplasma gondii is a protazoa which can inhabit he human body via parasitic infection. Toxoplasma causes causes the disease toxoplasmosis in human hosts and is transmitted through cat faeces.

Question 13

Describe a detrimental protazoa

Answer 13

Toxoplasma gondii is a protazoa which can inhabit he human body via parasitic infection. Toxoplasma causes causes the disease toxoplasmosis in human hosts and is transmitted through cat faeces.

Question 14

A protazoa found in soil

Answer 14

Dictyostelium discoideum is a ameoba like slime mould found in soil where it grazes on bacteria found there. It has benefited the scientific community as it has been used to study cell movement.

Question 15

A protazoa found in water

Answer 15

Paramecium are found in freshwater where the use there cilia for locomotion.

Question 16

A beneficial protazoa

Answer 16

Dictyostelium discoideum is a ameoba like slime mould found in soil where it grazes on bacteria found there. It has benefited the scientific community as it has been used to study cell movement.