Most cycads are pollinated by insects
A. true
B. false
A
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Why are osprey and bald eagles more likely to have a higher level of DDT in their tissues than other species in the community? a. They are more likely to be sprayed with DDT
b. They directly eat the plants that have the DDT in them. c. They are migratory so they are more likely to encounter DDT in some environment. d. They live for a long time. e. None of these choices.
PTH (parathyroid hormone) does all of the following
EXCEPT a. stimulates calcium release from bones. b. suppresses calcium reabsorption by the kidneys. c. enhances osteoclast action. d. activates vitamin D in the gut. e. indirectly stimulates calcium absorption by the gut.
What is the function of the generative cell in conifers?
A. Maturation of the female cone B. Dispersal of the pollen C. Formation of the sperm D. Growth of the megaspore E. Production of the archegonium
All of the following infections can result from drinking contaminated water EXCEPT
A) Cyclospora infection. B) giardiasis. C) trichinellosis. D) cholera. E) cryptosporidiosis.