Sponges in which sperm develop before eggs are placed in which category?
Correct answer A. Protandrous
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Biology MCQs
Page 39 of Biology multiple-choice questions with answers. Tap an option to check yourself.
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Which Antarctic sponge grows more than a metre tall?
Correct answer D. Scolymastra joubini
The lifespan of red blood cells is about:
Correct answer B. 120 days
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What is the function of the coelom?
Correct answer B. To provide space for the development of organs and systems
In most triploblastic animals, how are the three germ layers represented after embryonic development?
Correct answer A. Structures formed from them
What does a lack of vitamin A lead to?
Correct answer C. Night blindness
Which phylum is NOT included in the series Protostomia?
Correct answer D. Echinodermata
What is a coelom called when it forms as outpouchings of the archenteron?
Correct answer C. Enterocoelom
Which of the following is not a protostome?
Correct answer D. Hemichordates
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What does a severe deficiency of vitamin D cause?
Correct answer C. Rickets
What makes up the inner layer of sponges?
Correct answer D. Choanocytes
Sperm cells arise from which germ layer?
Correct answer C. Mesodermal
From which germ layer is the gut of pseudocoelomates formed?
Correct answer C. Endoderm
What are the needle-like structures forming the skeleton of sponges called?
Correct answer B. Spicules
In sponges, what are the internal buds called?
Correct answer B. Gemmules
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What is the Venus flower basket also called?
Correct answer B. Euplectella
In acoelomates, from which germ layer does the gut originate?
Correct answer A. Endodermal
Which system is well developed in acoelomate animals?
Correct answer D. All of these
If the fate of each blastomere is fixed early in development, what type of cleavage is it?
Correct answer B. Spiral and determinate
All animals of the grade Radiata are what?
Correct answer A. Diploblastic