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In a typical angiosperm, what is the sequence of structures encountered by the tip of a growing pollen tube on its way to the egg? 1. Micropyle 2. Style 3. Ovary 4. Stigma A. 4 → 2 → 3 → 1 B. 4 → 3 → 2 → 1 C. 1 →3 → 4 → 2 D. 3 → 2 → 4 → 1

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Correct option is (A)  4 → 2 → 3 → 1.

Rose pollen tube growth resembles that of other Rosaceae and, consequently, other genera. A rose pollen grain that lands on a stigma absorbs water, rehydrating the stigma. The pollen grain experiences intense metabolic activity, which causes it to begin to grow and develop into a pollen tube in response to various signals, particularly those of pollen-stigma interaction. The pollen tube enters the pistil by expanding between the stigmatic cells' walls and moving through an extracellular matrix in the style's transmitting tissue. When the pollen tube reaches the ovary, it is drawn to an ovule that has an egg cell in it.

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