BIO 121 LAB 1 QUESTION BANK 2026
EXPERIMENTAL METHODS REVIEW
UPDATED A+
◉ Miracidium.
Answer: ciliated larval stage of Fasciola
penetrate the first intermediate host; nearly always a snail
◉ Sporocysts.
Answer: germ sacs
produced by asexual reproduction
◉ Rediae.
Answer: maggot-like structures
◉ Cercariae.
Answer: shed off snail into water
◉ Metacercariae.
Answer: resting stage in a second intermediate host
, ◉ Predator-prey pathways.
Answer: parasitic Trematoda chooses intermediate hosts that are
prey to its final destination host
◉ Class Cestoda.
Answer: includes tapeworms
parasitic and mature in intestines of vertebrates
diagnostic features - scolex (attaches parasite to intestinal wall of
host), proglottids (special reproductive segments)
require at least 2 hosts
◉ Phylum Rotifera.
Answer: triploblastic
bilateral symmetry
pseudocoelomate - body cavity develops from blastocoel, between
endoderm and mesoderm
important ecologically as zooplankton
use cilia for movement, located centrally on the corona
definitive diagnostic feature - mastax - a grinding structure
◉ Metazoan.
Answer: multicellular
EXPERIMENTAL METHODS REVIEW
UPDATED A+
◉ Miracidium.
Answer: ciliated larval stage of Fasciola
penetrate the first intermediate host; nearly always a snail
◉ Sporocysts.
Answer: germ sacs
produced by asexual reproduction
◉ Rediae.
Answer: maggot-like structures
◉ Cercariae.
Answer: shed off snail into water
◉ Metacercariae.
Answer: resting stage in a second intermediate host
, ◉ Predator-prey pathways.
Answer: parasitic Trematoda chooses intermediate hosts that are
prey to its final destination host
◉ Class Cestoda.
Answer: includes tapeworms
parasitic and mature in intestines of vertebrates
diagnostic features - scolex (attaches parasite to intestinal wall of
host), proglottids (special reproductive segments)
require at least 2 hosts
◉ Phylum Rotifera.
Answer: triploblastic
bilateral symmetry
pseudocoelomate - body cavity develops from blastocoel, between
endoderm and mesoderm
important ecologically as zooplankton
use cilia for movement, located centrally on the corona
definitive diagnostic feature - mastax - a grinding structure
◉ Metazoan.
Answer: multicellular
