السؤال 104

An insect-pollinated flower has to load pollen onto a visitor and then catch it again on the next flower. Which combination of features does that?

Smooth light pollen, with a feathery stigma hanging outside the flower
Sticky pollen, with a feathery stigma hanging outside the flower
Sticky or spiky pollen, with a sticky stigma held inside the flowerالإجابة الصحيحة
Smooth light pollen, with a sticky stigma held inside the flower

الشرح

Pollen that clings to an insect and a receiving surface that grabs it back again are a matched pair, and both are placed inside the flower where a visitor cannot avoid brushing them. Feathery receiving surfaces held out in the open are built to strain pollen from moving air, so they belong to flowers that never meet a pollinator at all.

الشرح

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