Mounted specimen can be preserved by the use of

2% mercuric chloride

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2% formaldehyde

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2% alcohol

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2% malation

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Solution

The correct option is A 2% mercuric chloride
Herbarium is the collection of dried plant parts and arranged systematically with related data on paper. During the preparation of herbarium, there are the chances of damage to the specimen by maggots, ticks etc. So, to avoid this problem, 2% mercuric chloride is used to control insect and fungal infestations in herbarium collections. Thus, the correct answer is option A.

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