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BCOR Exam 2
Terms in this set (30)
The most recent common ancestor of all animals probably resembeled a choanoflagellate because:
Some cells in sponges and other animal taxa resemble choanoflagellate cells
The major loss of taxa at the end of the Cambrian period was an example of a:
Almost all of the major animal body plans seen today appeared in the fossil record over 500 million years ago at the beginning of the:
The distinction between sponges and other animal phyla is based mainly on the presence/absence of
sequence of events during a chordate animal's early development
4. infolding to form a neural tube
Which class of cnidarians has highly toxic venom and sophisticated eyes?
which characteristic is shared by both cnidarians and flatworms?
digestive systems with a single opening
The Lophotrochophora clade includes:
flatworms, mollusks, annelids
A segmented animal with a cuticle and more than a dozen very similar body segments, each with one pair of jointed legs. The animal is probably a:
Which insect order is associated with two pairs of scaly flight wings?
Which insect order has one pair of wings and a pair of wing-derived balancing structures (haltares)?
have anuses derived from the blastopore
What are features of almost all chordates?
-a dorsal, hollow nerve chord
In the most primitive chordates, such as the lancelet, pharyngeal slits function as:
suspension feeding devices
the suspected feeding mode of the long-extinct conodonts was:
predation or scavenging
gnathostome placoderms were efficient predators because they possessed:
which is a land plant that produces flagellated sperm and has a sporophyte dominated life cycle?
What trends in terresterial vegetation occured between 475 million years ago and 300 million years ago? (end of carboniferous period)
-a trend in from dominant gametophytes to dominant sporophytes
-a trend from no true leaves, to microphylls, to megaphylls
-a trend from soil-surface-hugging plants to "overtopping" plants
-a trend toward increased lignification of conducting systems
Which plants evolved most recently and appeared latest in the fossil record?
In angiosperm and gymnosperm plants, which of the following most directly produces the pollen tube?
gymnosperms differ from both extinct and extant ferns because they:
which flower part develops into a seed?
which feature of the amniotic egg made it such an important evolutionary breakthrough?
it can be incubated in environments that lack abundant moisture
angiosperm double fertilization is so called because it leads to the formation of:
one embryo and one endosperm from two sperm cells
flower parts occur in multiples of 4 or 5
which geological era or period saw the greatest diversification of angiosperms?
mammals that lay eggs
evolutionary innovations that allowed embryophytes to colonize terrestrial landscapes
-multicellular gametangia made fertilization easier
-alternation of generations
evolutionary innovations specific to angiosperms
evolutionary innovations in lizards but not lobe finned fishes
-lungs and ribcage
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