micro eco

What were the first living animals to appear in the ecosystem?

• A. Ladybugs

• B. Tiny flies

• C. Nematodes

• D. Spirotrichae

What factors contribute to the continued growth of calcium carbonate crystals in the ecosystem?

• A. Decreased water temperature and reduced light.

• B. Increased evaporation and replenishment with tap water, along with photosynthesis increasing pH.

• C. The presence of large insects and ladybugs.

• D. The formation of biofilms on the glass.

What type of algae has a glass exoskeleton?

• Chlamydomonas

• Cyanobacteria

• Diatoms

• Ciliates

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What type of microbial structure was observed, resembling a "tree with bacteria as leaves"?

• A colony of tubular algae.

• A cluster of spirotrichs.

• A biofilm made of bacteria and fungal threads.

• A group of predatory ciliates.

What is a characteristic feature of a Heliozoan, also known as a sun animalcule?

• It has a tubular body made of a string of cells.

• It possesses an amoeba-like body with needle-like pseudopods.

• It is a type of ciliate with a mean-looking head.

• It is a filamentous algae that forms tree-like structures.

What was a notable observation about the diatoms found in the ecosystem?

• They were all actively swimming and reproducing.

• The majority of them were dead.

• They formed complex filamentous structures.

• They were being preyed upon by Heliozoans.

How did the ecosystem in the aquarium change over seven months?

• It remained largely unchanged, consisting mostly of water.

• It became a grave for insects and spiders, with no new life.

• It evolved from just water to a diverse habitat for various microorganisms and small animals.

• It developed into a sterile environment due to bacterial infection.