: By placing a tiny grain of salt near the organism, you can observe chemotaxis . The organism will actively move away from the salt, proving that even a single cell can "sense" and react to danger. 4. Fascinating Facts for Your Report
Based on the 7th-grade biology curriculum by A.A. Vakhrushev (from the "School 2100" series), your laboratory work likely focuses on .
: 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. laboratornaia rabota po biologii 7 klass vakhrushev
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.
Investigation of the behavior and structure of Single-Celled Organisms. 1. Purpose of the Work : By placing a tiny grain of salt
: Amoebas reproduce by simple division. Technically, the "mother" cell doesn't die; it becomes two "daughters," making their lineage potentially ancient.
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 Fascinating Facts for Your Report Based on the
: While we use muscles and nerves, the amoeba uses a shifting cytoskeleton to hunt and travel. 5. Conclusion