How are bacteria the beginning and end of the nitrogen cycle? What will be an ideal response?
Bacteria are responsible for nitrogen fixation that is converting N2 in the atmosphere to NH4+ in the
soil. This is how nitrogen enters the biological cycle. At the other end, bacteria are responsible for
denitrification: converting NO3- back to N2. This removes nitrogen from biological access.
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In a shoot, where is the apical meristem located?
a. in the terminal bud b. in the center c. in the immature leaves d. in the leaf hair e. in the ground tissue
A cuticle
a. resists water loss. b. covers epidermal cells. c. may contain waxes and cutin. d. resists attack by microorganisms. e. does all of these
Aboveground shoots that develop from adventitious buds on roots are called __________
a. corms b. crowns c. plantlets d. suckers e. culms
The bottleneck effect
A. occurs when many members of a population die, resulting in a great loss of genetic diversity. B. occurs when many members of a population reproduce, causing too much genetic diversity within the population. C. occurs when small groups of individuals leave their home population and establish new settlements, mating only among themselves. D. occurs when large groups of individuals leave their home population and establish new settlements, mating only among themselves. E. does not occur in nature.