A ____ restricts productivity
a. primary producer
b. secondary producer
c. photosynthesizer
d. detritivore
e. limiting nutrient
ANSWER: e
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The pressure-flow hypothesis describes
A. how hormones move through the phloem. B. how carbohydrates enter the sieve tubes. C. how carbohydrates in solution move through the phloem. D. how water and minerals move through the xylem. E. how carbohydrates and minerals move through the xylem.
The Mesozoic era is often called the age of:
a. amphibians. b. fish. c. mammals. d. conifers. e. reptiles
Energy has discrete pockets called
A) wavelengths B) photons C) electro-magnetic spectrum D) pigments
Neurotransmitters act by binding to receptors that are
a. ligand-gated ion channels. b. located in the cytoplasm. c. tyrosine-kinase receptors. d. not coupled to G proteins.