Life cycle of protists

Question 1

: motile feeding stage requiring ample food and moisture to stay active
(active phase)

Answer 1

Trophozoite:

Question 2

Name the 2 structures of a protsist life cycle

Answer 2

1)Trophozoite(motile feeding stage requiring ample food and moisture to stay active)

2)Cyst- Dormant, resting stage when conditions in the environment become unfavorable
Resistant to heat, drying, and chemicals
Can be dispersed by air currents
Important factor in the spread of disease

Question 3

Explain cysts and why they are so important

Answer 3

Dormant, resting stage when conditions in the environment become unfavorable
Resistant to heat, drying, and chemicals
Can be dispersed by air currents
Important factor in the spread of disease

Question 4

Some protozoan groups exist only in the trophozoite phase. An example of this that can cause disease is the
Non-cysts protist that can cause disease

Answer 4

Trichomonas Vaginalis or T. Vaginalis

Trichomonas vaginalis, a common STD, does not form cysts and must be transmitted by intimate contact

Question 5

Many alternate between trophozoite and cyst stage, depending on the

Answer 5

habitat

Question 6

What are some protists that form cysts and can cause disease to humans?

Answer 6

Entamoeba histolytica and Giardia lamblia form cysts and are readily transmitted in contaminated water and food

Question 7

How do protists reproduce?

Answer 7

asexual mitotic cell division or multiple fission.
or sexual reproduction by conjugation(ciliates)