A rubber band stretches and reverts back to its original position. Bubble gum stretches, but it would not return to its original position. Is there any difference between the two processes? Discuss it with respect to plant growth (hint elasticity -reversible & plasticity-irreversible).

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Solution

$\begin{matrix} E l a s t i c i t y & P l a s t i c i t y T h e e l a s t i c i t y i s s t r e t c h a b i l i t y o f t h e & D i f f e r e n t p a t h w a y s i n r e s p o n s e t o p l a n t c e l l s o r p r o d u c t s, e . g ., r u b b e r / l a t e x & e n v i r o n m e n t o r p h a s e s o f l i f e t o f o r m e t c . & d i f f e r e n t k i n d s o f s t r u c t u r e i s c a l l e d p l a s t i c i t y . T h e e l a s t i c s u b s t a n c e s c a n r e v e r t b a c k & T h e p l a s t i c s u b s t a n c e s a n d p h e n o m e n o n t o i t s o r i g i n a l f o r m i n r e l a x e d s t a t e . & o f p l a s t i c i t y a r e n o t r e v e r s i b l e, i . e ., e . g ., s t r e c h i n g o f r u b b e r . & i r r e v e r s i b l e . e . g ., d i f f e r e n c e i n s h a p e s o f l e a v e s p r o d u c e d i n a i r a n d t h o s e p r o d u c e d i n w a t e r i n b u t t e r c u p . T h i s i s a l s o k n o w n a s h e t e r o p h y l l y . \end{matrix}$

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An elastic rubber band is stretched between two points. Will it produce any sound?

The diagram shows a force – extension graph for a rubber band. Consider the following statements

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