"That’s the ," Mr. Petrov replied, showing a diagram where the cells looked like they were being stretched like taffy. "They don't divide anymore; they just grow longer, physically shoving the root tip into the earth."
As the presentation ended, Mr. Petrov handed out small magnifying glasses and sprouted beans. "The slides are over," he said with a wink. "Now, go find the 'helmets' and the 'hairs' yourselves." urok-prezentcija zony kornja 6 klass po biologii
"Everyone thinks roots are just brown sticks in the dirt," Mr. Petrov began, clicking his remote. "But they are actually highly organized machines." "That’s the ," Mr
"But how does it get so long?" asked Masha from the front row. Petrov handed out small magnifying glasses and sprouted
The bell rang, and Mr. Petrov’s 6th-grade biology class scrambled to their seats. On the whiteboard, the title of the day’s presentation flickered:
Finally, he showed the top part of the root, where it met the stem. "The . This is the highway. Once the root hairs grab the water, this zone pumps it all the way up to the leaves so the tree can grow."