21) Blue crabs, a crustacean have unique kind of developmental stages called A)

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21) Blue crabs, a crustacean have unique kind of developmental stages called A) niaid B) D) eggs E)both B and C 22) Which of the following groups of terms best describes the acoelomorpha? A) triploblastic; bilaterally symmetric; simple digestive tracts; mobile B) triploblastic; radially symmetric; simple digestive tracts; immobile C) diploblastic; bilaterally symmetric; complex digestive tracts; mobile D) triploblastic; radially symmetric; simple digestive tracts; mobile 23) What do all deuterostomes have in common? A. The pore formed during gastrulation becomes the anus. B. Adults are bilaterally symmetrical. C. Embryos have pharyngeal pouches that may or may not form gill slits. D. All have specialized head and tail regions E. All have a spinal column. 24) Which of these mollusk features substitutes for the coelom by providing a space for organ development and circulation of bodily fluids? A. mantie cavity B. mantle C.foot D. visceral mass E) both B and C 25) Currently the only predators of Galápagos marine iguanas are Galápagos hawks. Iguana body size is not correlated with risk of hawk predation, although small iguanas can sprint faster than large iguanas. IH predators (e-g, cats) that preferably catch and eat slower iguanas are introduced to the island, iguana body size is likely to in the absence of other factors; the iguanas would then be under selective outcome. A. increase; directional B. increase; disruptive C. decrease; directional D. decrease; stabilizing E stay the same; stabilizing 26) Based on how you would go about measuring biodiversity, which of the following is true? A.The easiest animals to study are the insects as they are so large. B. Bacteria are among the casiest to count regarding numbers of different species. C. Species in the tropics are much easier to study than species in other biomes. D. The most intensively studied lineages are vertebrates. 27) A cephalopod's tentacles are modified from its A. mantle B. visceral mass C. foot D. H.A.M E.radula 28) True or False My favorite familial taxon of hexapoda are the formicids (ants) A. True B. False 29) Honey bees are known as good pollinators, what group of plants do they visit? A. Angiosperms B. Gymnosperms C. Pteraphyta D. Non-vascular E) both B and C 30) True or False: Tunicates, lancelets, and mollusks are all invertebrate chordates. A) True B) False mesoderm. 3TRUE or FALSE. Nematodes are animals with a body cavity between the endoderm and the A) True B) False 32) TRUE or FALSE. The nymph stage precedes the pupa stage in complete metamorphosis A) True B) False 33) TRUE or FALSE. Most extent echinoderms have bilateral symmetry as larvae. A) True B) False throwhti h ot the tolowing classes is comprised of carnivorous predat through their mouths to feed? A) ors that are able to extend their stomachs E) Holothuroldea D) Crinoidea C) Ophluroidea B) Asteroidea 35) TRUE A) True or FALSE. All metazoa taxa are believed to have evolved from a single common ancestor. B) False

Explanation / Answer

Ans 21 : E) both B and C

The blue crabs have unique developmental stages.

The zoea is a microscopic larvae . This zoea molt into megalope , which has crab like formulae but with an extended abdomen. These crabs molt about 18 - 23 times before attaining their actual maturity.

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