The alga, Chara is called as stone wort because its body has

CaCO

_{3}

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CaC

_{2}

_{4}

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CaHCO

_{3}

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CaCl

_{2}

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Solution

The correct option is A CaCO $_{3}$
Chara plants are also known as stoneworts - stone plants. The 'stony' part of the plant is composed of calcium carbonate in the form of hard crystalline calcite that impregnates cell walls. Calcite is produced by diverse groups of organisms, from the unicellular algae to shelly invertebrates. The calcite protects these organisms from herbivores and predators. The calcite-impregnated walls of Chara make this plant less appealing to grazers.
Thus, the correct answer is option A.

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