Which of these situations regarding phloem sources and sinks is not correct?
A. During autumn, deciduous tree roots would be a sink.
B. Young leaves are sinks.
C. The root of a carrot plant is a source.
D. In a seedling, the cotyledons would be sources.
E. A growing pumpkin is a sink.
Answer: B
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Oak trees and many other plant species have years in which they have synchronous production of many progeny by all individuals in a population. This is known as
A. sympatry. B. crypsis. C. semelparity. D. masting.
The cell wall is a common feature to
_____ prokaryotic cells only. _____ plant cells only. _____ animal cells only. _____ prokaryotic and plant cells. _____ all cells.
What is at the center of a heme molecule in a
hemoglobin?
a. a beta globin chain b. an alpha globin chain c. iron d. nitrogen e. another heme molecule
Which of the following contains the most cells?
A) tissue B) an organ C) an organ system D) an organism