Caroline Menzies – Georgian Bay
To observe how the simplest organisms, despite consisting of only one cell, perform all the functions of a complex living being—specifically movement and response to the environment (irritability). 2. Materials and Equipment Microscope and glass slides.
A particularly interesting topic to explore is the (or similar protozoa like the Paramecium). Below is a structured report designed to be both scientifically accurate and engaging. Laboratory Report: Life in a Drop of Water laboratornaia rabota po biologii 7 klass vakhrushev
Culture of Amoeba proteus or Paramecium caudatum (hay infusion). Cotton wool fibers (to slow down the organisms). A crystal of table salt (for the irritability experiment). 3. Course of the Observation To observe how the simplest organisms, despite consisting
: While we use muscles and nerves, the amoeba uses a shifting cytoskeleton to hunt and travel. 5. Conclusion A particularly interesting topic to explore is the
Based on the 7th-grade biology curriculum by A.A. Vakhrushev (from the "School 2100" series), your laboratory work likely focuses on .
Single-celled organisms are not "primitive." They are highly efficient biological machines. The laboratory work demonstrates that the fundamental properties of life—nutrition, movement, and irritability—are present even at the microscopic level. Comparison Table: Amoeba vs. Paramecium Amoeba Proteus Paramecium (Slipper Ciliate) Pseudopodia (flowing) Cilia (rowing) Shape Constantly changing Constant (slipper-like) Speed Relatively fast Feeding Phagocytosis (engulfing) Oral groove (sweeping food in)
: Under the microscope, these organisms appear as transparent, ever-shifting shapes. In Vakhrushev's textbook, emphasis is placed on the pseudopodia (false feet) of the amoeba. It doesn't just move; it "flows" by pushing its cytoplasm forward.
