Which solution can be used to induce the germination of pollen grains and the formation of a pollen tube in plants?
- A$10 \%$ sugar solution
- B$10 \%$ protein solution
- C$10 \%$ lipid solution
- D$10 \%$ alcohol solution
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$A$: Initial growth of the pollen tube takes place at the expense of food present in the stigma and style.
$R$: The pollen tube travels intracellularly and chemotactically.
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