Assertion :Druses are the crystals abundant in papaya and colocasia. Reason: These plants have high content of calcium oxalate.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
Cell inclusions are non living substances of four categories- reserve, excretory, pigment and mineral. Due to their presence, a cell may become different from other surrounding cells. It is then called as idioblast.
Mineral crystals are of several types. Calcium carbonate occurs as a mass of crystals around a cellulose core to form cystolith (leaf hypodermis of Banyan).
Cystolith is like a bunch of grapes. Calcium oxalate forms needle-like raphides (example Lemna, Eichhornia), prismatic crystals (example scales of Onion), star shaped sphaeraphide or druses (example Colocasia, Chenopodium) or powdery mass named crystal sand (example Atropa).

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