Raphides are needle shaped crystals of

Calcium carbonate

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Calcium oxalate

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Calcium pectinate

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Magnesium sulphate

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Solution

The correct options are
A Calcium carbonate
B Calcium oxalate
The extra calcium is deposited in the plant in form of crystal. The needle-shaped crystals of calcium oxalate as the monohydrate or calcium carbonate as aragonite, are known as raphides. These can be traced in more than 200 families of plants. One of the ends of raphides is sharp while the other is blunt.
Thus, the correct answer is option A and B.

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__ is the common name for calcium sulphate with water of crystallization.

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