chapter 26 section 1

Question 1

protozoans are members of the kingdom

Answer 1

protista

Question 2

3 characteristics that are found in protozoans are

Answer 2

heterotrophy, motility, parasitism

Question 3

all protozoa are capable of

Answer 3

asexual reproduction

Question 4

many protozoa survive under extreme environmental conditions by

Answer 4

becoming dormant inside a hardened external covering

Question 5

protozoa are though to have evolved from

Answer 5

early eukaryotes

Question 6

in what type of ecosystem are zooplankton found? what role do they play in such ecosystems

Answer 6

aquatic ecosystems

one of the primary sources of energy (food)

Question 7

name two human diseases caused by protozoa

Answer 7

malaria, amebic dysentery, giardiasis

Question 8

list three factors that can trigger cyst formation in protozoa

Answer 8

nutrient deficiency, changes in temperature or pH, drought

Question 9

bacteria and protozoa both undergo conjugation. why is this process more complex in protozoa than in bacteria.

Answer 9

since protists are eukaryotes, their chromosomes are contained inside a nucleus, which must break down and then reform for conjugation to occur. Bacteria lack a nucleus, so division and exchange of genetic information is easier

Question 10

why are there no free living protozoa in environments that are dry year round

Answer 10

protozoa live in only aquatic environments

environments without water lack protozoa

Question 11

short hairlike projections

Answer 11

cilium

Question 12

contains digestive enzymes where food is broken down

Answer 12

food vacuole

Question 13

long hairlike structures used for moving

Answer 13

flagellum

Question 14

detects changes in quantity and quality of light

Answer 14

eyespot

Question 15

large, rounded cytoplasmic extensions. moves sarcodina

Answer 15

pseudopodium