Questions and Answers
What is the size range of Stentor?
Euglena is exclusively classified as algae.
False
Where would you commonly find Hydra?
Attached to surfaces like water plant stems and the undersides of floating leaves.
The genus of Stentor is called ______.
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What classification do Daphnia belong to?
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What distinctive shape does Stentor adopt when attached to a surface?
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Match the organisms with their size range:
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What is a characteristic feature of Actinosphaerium?
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Study Notes
Stentor (Single-Celled)
- Genus of one of the largest freshwater protozoans, measuring up to 2-3 mm long.
- Commonly found attached to plants or algae and in planktonic environments.
- Characterized by a trumpet shape when attached, utilizing cilia for feeding on smaller organisms.
- Can swim and assumes an oval shape; often green due to associated algae.
- Contains many nuclei, visible as a "string of pearls."
- Belongs to Kingdom Protoctista, Phylum Ciliophora.
Spirogyra (Single-Celled)
- Genus of filamentous algae with sizes ranging from 10 µm to over several cm long.
- Often forms floating green masses with a slimy texture.
- Composed of single cells arranged end-to-end in long threads, featuring distinctive spiral ribbon-like plastids.
- Used as a classic example of filamentous algae in biology textbooks.
- Classified under Kingdom Protoctista, Phylum Gamophyta.
Euglena (Single-Celled)
- Genus size ranges between 25-100 µm, often coloring water green due to abundance.
- Planktonic organism that exhibits characteristics of both algae (photosynthesis, green color) and protozoa (movement with flagella).
- Features a red eye spot and can be observed under a microscope, moving in and out of focus.
- Classification remains debated, currently placed in Kingdom Protoctista, Phylum Discomitochondria.
Actinosphaerium (Single-Celled)
- Size between 200-1000 µm, found in plankton and among aquatic plants.
- Known as Heliozoans or "sun-animalcules," recognized for hair-like pseudopodia called axopodia.
- Studied frequently under a microscope due to interesting morphology.
- Related smaller species found in genera such as Actinophrys and Acanthocystis.
- Classified under Kingdom Protoctista, Class Heliozoa.
Hydra (Multicellular)
- Size ranges from 4-30 mm including tentacles; typically attached to surfaces like plant stems or floating leaves.
- Recognizable for tentacles and can often be seen in jars of standing pond water.
- Utilizes asexual reproduction by budding—where smaller hydra grow off the adult before separating.
- Tentacles contain stinging cells for capturing prey, particularly small water fleas.
- Represents Phylum Cnidaria, distinguished as the most primitive animal group with various organized cell layers.
Daphnia (Multicellular)
- Size varies from 0.5-4 mm; commonly planktonic and found among plants or organic matter.
- Known as water fleas, easily observable under a microscope due to transparent shell revealing beating heart and moving limbs.
- Daphnia is often available in pet shops as food for fish; similar genera include Simocephalus (larger) and Chydorus (smaller).
- Identified by jerky movements of second antennae, contributing to common name.
- Females often carry live young, with birthing observable during examinations.
- Classified under Kingdom Animalia, Phylum Crustacea, Order Cladocera.
Paramecium (Single-Celled)
- Size ranges from 60-300 µm, frequently found in plankton or organic material.
- Notable for its distinct shape and size, making it one of the larger single-celled organisms in ponds.
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Description
Explore the fascinating world of protists with our flashcards on Stentor and other single-celled organisms. This quiz covers key definitions, characteristics, and habitats of various protists, enhancing your understanding of this diverse group. Perfect for students studying science at any level.
