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A passive hydathode comprises a group of...

A passive hydathode comprises a group of loosely arranged colourless and parechymatous cells known as

A

spongy parenchyma

B

aerenchyma

C

apithem

D

prosenchyma

Text Solution

Verified by Experts

The correct Answer is:
C
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The well known mineral fluorite is chemically calcium fluoride. It is known that in one unit cell of this mineral there are 4 Ca^(2+) ions and 8F^(-) ions and that Ca^(2+) ions are arranged in a fcc-lattice. The F^(-) ions fill all the tetrahedral holes in the face centred cubic lattice of Ca^(2+) ions. The edge of the unit cell is 5.46 xx 10^(-8) cm in length. The density of the solid is 3.18 g cm^(-3) . Use this information to calculate Avogadro's number. (Molar mass of CaF_(2) = 78.08 g mol^(-1) )