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Sponge: Quiz

  
  
  

Question 1: It is generally thought that sponges' closest single-celled relatives are ________, which strongly resemble the cells that sponges use to drive their water flow systems and capture most of their food.
EukaryoteFungusAscomycotaChoanoflagellate

Question 2: Most sponges are ________ (function as both sexes simultaneously), although sponges have no gonads (reproductive organs).
SpeciesHermaphroditeSexual differentiationIntersexuality

Question 3: The amount of tissue that needs food and ________ is determined by the volume, but the pumping capacity that supplies food and oxygen depends on the area covered by choanocytes.
OxygenNitrogenHeliumHydrogen

Question 4: Sponges' cells absorb oxygen by diffusion from the water flow system, into which carbon dioxide and other soluble waste products such as ________ also diffuse.
HydrogenNitrogenChlorineAmmonia

Question 5: The syncytium's cytoplasm, the soupy fluid that fills the interiors of cells, is organised into "rivers" that transport nuclei, ________ ("organs" within cells) and other substances.
Cell nucleusOrganelleCell (biology)Mitochondrion

Question 6: [33] Well-preserved fossil sponges from about 580 million years ago in the ________ period have been found in the Doushantuo Formation.
Geologic time scaleEdiacaranCambrianEdiacara biota

Question 7: Calcareous sponges produce spicules made of ________.
Calcium oxideCalcium silicateCalcium hydroxideCalcium carbonate

Question 8: Sponges with photosynthesizing ________ produce up to three times more oxygen than they consume, as well as more organic matter than they consume.
DNABacteriaEndosymbiontOrganism

Question 9: Their spicules, which are made of silica, form a ________-like framework between whose rods the living tissue is suspended like a cobweb that contains most of the cell types.
WoodSteelScaffoldingAluminium

Question 10: ________ spicules like those of demosponges have been reported from Nevada in rocks dated around 750 million years ago.
QuartzSilicon dioxideAmethystOpal
















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