Both animals and plants grow. Why do we say that growth and differentiation in plants are open and not so in animals?

Does this statement hold true for sponges also?

Open in App

Solution

Growth and identification in plant and animals can be explianed as follows

$\begin{matrix} Growth in plants & Growth in Animals P l a n t g r o w t h i s i n d e t e r m i n a t e, i . e ., c e l l s c a n d i v i d e & A n i m a l g r o w t h i s d e t e r m i n a t e, i . e ., t i l l a n d e n l a r g e c o n t i n u o s l y f o r l i f e t i m e . & f i n i t e p e r i o d, t h e y m a t u r e a n d s t o p g r o w i n g e x t e r n a l l y . G r o w t h i s o p e n d u e t o p r e s e n c e o f m e r i s t e m a t i c & C e l l d i v i s i o n i s d i s t r i b u t e d t h r o u g h - o u t c e l l s w h i c h k e e p d i v i d i n g, & t h e b o d y o f o r g a n i s m t o r e p l a c e o l d i . e ., g r o w i n g a n d r e p l a c i n g n e w o r g a n s . & a n d d a m a g e d c e l l s, r a t h e r l o c a l i s e d a t s p e c i f i c r e g i o n s . S t r u c t u r e i n p l a n t s a t t r i p s o r m e r i s t e m a t i c z o n e s i s & A f t e r a s p e c i f i c t i m e p e r i o d n e v e r c o m p l e t e, o w i n g t o o p e n e n d e d t i p s o r & i . e ., e m b r y o n o i c, t h e g r o w t h r a t e i s a p i c e s . & r e d u c e d i n j u v e n i l e p h a s e a n d c e a s e s P l a n t g r o w t h i s i n a m o d u l a r f a s h i o n, i . e ., g r o w s & i n m a t u r i t y . l o n g i t u d i n a l l y, l a t e r a l l y a n d i n g r i t h . \end{matrix}$

Sponges are exception to this.They show open growth as every cell of their body can give rise to an individual and their growth and differentiation is continous is their life cycle.

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Similar questions

Question 28:

1)Does the growth pattern in plants differ from that in animals? Do all the parts of plant grow indefinitely?

2)If not, name the regions of a plant, which can grow indefinitely.

'Both growth and differentiation in higher plants are open'. Comment.

‘Both growth and differentiation in higher plants are open’. Comment.

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