Which of the following diagram is correc...

Which of the following diagram is correct ? Why?

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Diagram (a) is correct, because roots show positive geotropism and stem shows negative geotropism.

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Which of the following formulae is correct ?

CaCl

`Na_(3)N`

`NaSO_(4)`

NaS

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Terylene is an addition polymer.

Buna-N is a copolymer.

Nylon-2-Nylon-6 is non-biodegradable polymer.

Nylon-6 is polyester type of polymer.