During embryogenesis of diploblastic and triploblastic animals, the embryo becom
ID: 252614 • Letter: D
Question
During embryogenesis of diploblastic and triploblastic animals, the embryo becomes multilayered (i.e., the germ layers are differentiated) through the process of:
blastulation
enterocoely
coelom formation
gastrulation
cleavage
You turn over a rock in your garden and dozens of little animals may be seen squirming, crawling, or running around on top of or just underneath the soil. Which of the following groups are you LEAST likely to find represented there?
nematode
arthropod
annelid
gastropod
echinoderm
Which of the following statements is NOT true of animal development?
development progresses from zygote to blastula to gastrula
all eumetazoans undergo cleavage during development
all deuterostomes are coelomate
gastrulation in diploblastic animals produces two germ layers
acoelomate organisms are characterized by a lack of mesodermal tissue
Many adult plants get by without any flagellated cells. However, adult sponges could not survive without flagellated cells because they depend upon them for
creating water currents for feeding.
moving around in their environment.
getting rid of undigested wastes.
defense against predators.
sweeping pathogens out of the body.
blastulation
enterocoely
coelom formation
gastrulation
cleavage
You turn over a rock in your garden and dozens of little animals may be seen squirming, crawling, or running around on top of or just underneath the soil. Which of the following groups are you LEAST likely to find represented there?
nematode
arthropod
annelid
gastropod
echinoderm
Which of the following statements is NOT true of animal development?
development progresses from zygote to blastula to gastrula
all eumetazoans undergo cleavage during development
all deuterostomes are coelomate
gastrulation in diploblastic animals produces two germ layers
acoelomate organisms are characterized by a lack of mesodermal tissue
Many adult plants get by without any flagellated cells. However, adult sponges could not survive without flagellated cells because they depend upon them for
creating water currents for feeding.
moving around in their environment.
getting rid of undigested wastes.
defense against predators.
sweeping pathogens out of the body.
Explanation / Answer
1. Option 4 is correct.
Gastrulation is responsible for the multilayer structures of embryos in diploblastic and triploblastic animals.
2. Option 5 is correct.
Echinoderms are most aquatic (Oceanic). It is very unlikely to find them in the backyard.
3. Option 5 is correct.
Acoelomates also contain mesoderm tissues.
4. Option 1 is correct.
Sponges are dependent on water for their feeding and reproduction.
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