Sentence:  The staminate willow catkins , then , provide their visitors with both nectar and pollen ; a marvelous arrangement , for it provides exactly what the bee queens need to make their <WSD>beebread</WSD> , a combination of honey and pollen with which the young of all species are fed . 
Meaning of the word marked with <WSD> tags:  a mixture of nectar and pollen prepared by worker bees and fed to larvae