Thursday, October 7, 2010
Red Questions - quiz #100
We will start to post weekly here the "red questions" of our quizzes after a suggestion of one of our top contenders - Rodolphe Boulanger.
He said: "I know nothing about the sugars that prevent water going from roots to shoots... so I'm going to have to research that. It would be helpful for all, I think, if next week when the answers are posted, there's an explanation posted too because I know that most people aren't crazy like us and are not looking everything up in their free time!!!!"
And I agree with him, so here they are...
3) How many grape varieties are listed in the International Vitis Inventory maintained at the Federal Research Institut for Grape Breeding at Geilweilerhof in Germany?
According to the posting on Wikipedia:
"The Geilweilerhof Institute for Grape Breeding (Institut für Rebenzüchtung Geilweilerhof - IRZ) in Siebeldingen, Germany specializes in breeding grape vine varieties that combine resistance to fungal diseases, frost, and drought with superior wine qualities. It is part of a federal German agricultural research and breeding institute called Bundesanstalt für Züchtungsforschung an Kulturpflanzen. It developed the successful red Regent grape. It has experimental stations in Palatinate, Rheingau and Franconia and maintains germplasm of over 15,000 varieties. It has published the journal Vitis since 1957 and administers the Vitis International Variety Catalogue, a database of grapevine species and varieties."
8) Substances which impede the flow of water from the roots to the trunk and canes for the vine's acclimation process before winter:
a) Suberin and Glycerol
b) Suberin and Callose
c) Callose and Glycerol
d) Raffinose and Callose
In the book "Northern Winework" by Tom Plocher and Bob Parke (a great reference for growing grapes and making wine in cold climates), they say:
"Suberin and callose, substances which impede the flow of water from the roots to the trunk and canes, are deposited in the vascular tissues of the vines, at first slowing, but eventually ceasing the flow of water through the vine. Periderm forms, turning the canes form green to brown."
To play our most recent quiz: http://www.thewinehub.com/learn/quiz