Wave-like movement in the food pipe is caused by coordinated contraction and relaxation of muscle cells. This peristaltic motion pushes food steadily toward the stomach. Class 8 Science Curiosity Chapter 2 The Invisible Living World: Beyond Our Naked Eye NCERT solutions Class ...
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Yes organisms like amoeba, paramecium and mold may sometimes be seen as tiny spots or colonies. Ants or lice are the smallest creatures commonly visible without using any instruments. Class 8 Science Curiosity Grade 8 Chapter 2 The Invisible Living World ...
The word “lens” comes from the Latin word for lentil. This is because the first lenses were shaped like lentil seeds—small, curved and rounded—ideal for bending light to magnify objects. Class 8 Science Curiosity Chapter 2 The Invisible Living World: Beyond ...
Cheek cells are round or irregular, while onion cells are rectangular. Cheek cells lack a cell wall and chloroplasts, but onion cells have both, showing key plant vs. animal cell differences. Class 8 Science Curiosity Chapter 2 The Invisible Living World: ...