Praktikum Bimbingan Ciri-ciri Makhluk Hidup "Gerak Pada Tumbuhan" Praktikum IPA di SD

Summary

This video demonstrates an experiment on plant movements, focusing on three types: seismonasty, nyctinasty, and negative geotropism. Sari Puspita, a 7th-semester student from Universitas Terbuka Purwokerto, conducts trials with the sensitive 'mimosa pudica' plant. In seismonasty, the plant responds to touch, showing varying speeds based on the intensity of touch. In nyctinasty, the plant reacts to darkness, closing its leaves in a dark environment. Lastly, a geotropism experiment examines the growth direction of green beans. The practical experiments highlight how plants respond to environmental stimuli, providing a valuable learning experience in plant physiology.

Takeaways

• 😀 The presenter, Sari Puspita, introduces herself as a 7th-semester student from Universitas Terbuka Purwokerto, conducting a practical experiment on plant movement for a class project.
• 😀 The experiment focuses on three types of plant movements: Seismonasty, Nictinasty, and Negative Geotropism.
• 😀 Seismonasty is the plant movement caused by stimuli such as touch or vibration, demonstrated using a Mimosa pudica (sensitive plant).
• 😀 The first trial shows that when gently touched with a ruler, the leaves of the Mimosa pudica fold slightly, and it takes 3 minutes 40 seconds for them to reopen.
• 😀 A moderate touch causes more leaves to close, and it takes 4 minutes 40 seconds for the leaves to reopen, indicating a stronger response to more intense stimuli.
• 😀 A harsh touch causes all the leaves to fold rapidly, and the plant takes 8 minutes to reopen its leaves, demonstrating the plant's sensitivity to touch intensity.
• 😀 The presenter concludes that the speed and extent of leaf closure depend on the intensity of the touch, validating the concept of Seismonasty in Mimosa pudica.
• 😀 The second experiment demonstrates Nictinasty, where the Mimosa pudica leaves close in darkness, and the plant remains open in light.
• 😀 The plant is placed in a dark box (covered with black plastic), and after 30 minutes, the leaves close, proving that darkness triggers Nictinasty.
• 😀 The final experiment investigates Negative Geotropism using green bean seeds, where the seeds are planted in soil and placed under sunlight, showing how the roots grow in response to gravity.