Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Q: Interconnected pathways through which carbon is recycled through the biotic and abiotic components of biosphere.

A: Interconnected pathways through which carbon is recycled through the biotic and abiotic components of what?
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Q: The mitochondria organelles are known as the "power plants" of the cell.

A: What organelles are known as the "power plants" of the cell?
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Q: After the pollen tube does the diploid zygote form.

A:
When does the diploid zygote form?
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