Horozontal rows of parenchymal cells that tranport materials horizontally are called?
A. rays
B. tracheids
C. vessel elements
D. fibers
E. sieve tubes
A. rays
Rays are parenchyma cells produced in horizontal rows by special ray initials (meristematic cells) of the vascular cambium. They function in lateral conduction and food storage. Remember that vascular cambium is part of the secondary plant body and it produces woody tissues.
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________ reactions require an input of energy when electrons are gained, such as in the conversion CO2 ? CH4.
Fill in the blank(s) with the appropriate word(s).
Which term best describes the movement of NH4+ ions into a cell down an electrochemical gradient?
a. a symport b. passive diffusion c. facilitated diffusion d. active transport
The symmetry of echinoderms generally includes
A) radially symmetrical larvae and adults. B) bilaterally symmetrical larvae and adults. C) bilaterally symmetrical larvae and radially symmetrical adults. D) radially symmetrical larvae and bilaterally symmetrical adults.
What does most of the membrane functions?
What will be an ideal response?