Phloem transports products of photosynthesis from the ________ to a(n) ________
a. stomata / root
b. sieve tube / stoma
c. mesophyll / sink
d. companion cell / end plate
c
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The nitrogen-limitation hypothesis states that organisms select food in terms of the nitrogen content of the tissue. Why might this be true?
A. Animal tissue contains about 10 times as much nitrogen as plant tissue. B. Animals are able to "fix" nitrogen much more effectively than plants. C. Herbivores prefer plants with lower nitrogen content. D. High nitrogen levels are a key part of plant chemical defenses. E. Plant tissue contains about 10 times as much nitrogen as animal tissue.
Biologists think that the first photosynthetic cells
a. used water as an electron donor. b. were the first living cells to develop. c. lived more than 2.8 billion years ago. d. released hydrogen into the atmosphere. e. required oxygen rather than carbon dioxide.
Gases move freely across the walls of the bronchioles into the capillaries that surround them
____________________ Indicate whether the statement is true or false.
Red maples and other wind-pollinated plants invest relatively little in producing ________ but must invest a great deal in producing ________ to achieve good pollination rates
A) floral scents; showy petals B) showy or scented flowers; massive amounts of pollen C) pollen; showy or scented flowers D) seeds; massive amounts of pollen