Which of these situations regarding phloem sources and sinks is not correct?
A. The root of a carrot plant is a source.
B. Young leaves are sinks.
C. A growing pumpkin is a sink.
D. In a seedling, the cotyledons would be sources.
E. During autumn, deciduous tree roots would be a sink.
B. Young leaves are sinks.
A source is a photosynthetic tissue that produces sugars. Sinks are the parts of a plant where the sugar is utilized.
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A. It defines the boundaries of the cell. B. It is a semipermeable barrier. C. It consists mainly of a fixed, static, phospholipid bilayer. D. It uses proteins as selective gates and sensors. E. All of the choices are true.
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A. clines B. ecotypes C. castes D. species E. filial relatives
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1.bacteria. 2.retrovirus. 3.bacteriophage. 4.viroid. 5.prion.
__________ superficially resemble bivalves
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