alleryStart learning →The opening in the integuments through which a pollen tube enters is called what?
AThe micropyle
BThe perforation
CThe stigma tip
DThe seed hilum
Answer & Solution
Correct answer: A. The micropyle
1. A double layered integument protects the megasporangium and later the embryo sac.
2. The integuments do not enclose it completely and leave an opening called the micropyle.
3. The micropyle allows the pollen tube to enter the female gametophyte for fertilisation.
4. The stigma is the receptive surface where pollen first lands, at the far end of the carpel.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 32 "Plant Reproduction", section 32.1 Reproductive Development and Structure_
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