Which of the structures in Figure 50-3 is responsible for the production of hormones?
a. 1
b. 3
c. 4
d. 6
e. 7
D
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Gymnosperms can be both monoecious and dioecious. What does dioecious mean?
a. a sister group to the angiosperms b. diploid egg and sperm join at fertilization to form a tetraploid seed c. male and female sporangia produced by different plants d. having two ovules per scale in the cone
Which one of these is not a gymnosperm?
1.Cycadophytes 2.Ginkgophyta 3.Gnetophytes 4.Chloranthales
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.
Type I diabetes is a(n)
A) autoimmune disease. B) immunodeficiency disease. C) immune complex-mediated hypersensitivity disorder. D) delayed hypersensitivity disorder. E) immediate hypersensitivity disorder.