Seeds include all of the following EXCEPT
a. endosperm.
b. seed coats.
c. cotyledons.
d. integuments.
e. embryos.
Answer: d
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About 200 years ago, Jan Baptista van Helmont wanted to know where growing plants get the materials necessary for increases in size. He planted a tree seedling weighing 5 pounds in a barrel filled with 200 pounds of soil and then watered the tree regularly. After five years, the tree weighed 169 pounds, 3 ounces, and the soil weighed 199 pounds, 14 ounces. Because the tree had gained so much
weight and the soil had lost so little, he concluded that the tree had gained all of its additional weight by absorbing the water he had added to the barrel, but of course he was incorrect. What really happened? What will be an ideal response?
The zygomycete Pilobolus is noteworthy for its ability to ________
a. become an intracellular parasite of humans b. shoot its spores several meters c. produce truffles, a gourmet food d. infect amphibians
When a population goes through a bottleneck, ____
a. genetic drift is likely to occur b. mutation rates increase c. extinction rates decrease d. natural selection decreases in intensity e. inbreeding decreases
Classification of organisms into three domains is based on
A) the presence of a cell wall. B) the number of cells in the organism. C) cellular organization. D) nutritional requirements. E) cellular proteins.