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Question

Which of the following statement is not true for stomatal apparatus?


A
Guard cells are not always surrounded by subsidiary cells
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B
Stomata are involved in gaseous exchange
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C
Inner walls of guard cells are thick
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D
Guard cells invariably possess chloroplasts and mitochondria
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Solution

The correct option is A Guard cells are not always surrounded by subsidiary cells
Stomata are present on the lower surface of the leaves, these help in the gaseous exchange. Stomata are surrounded by gaurd cells which are in turn surrounded by subsidiary cells, therefore their inner wall is thicker than the outer layer. However, Guard cell do posses chloroplast but mitochondria are absent. 
So, the correct option is 'Guard cells invariably possess chloroplasts and mitochondria.'

Biology

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