Identify four external features of a woody twig and briefly explain the function and/or origin of each. What will be an ideal response?
terminal bud at the tip: embryonic shoots
axillary buds in leaf axils: embryonic shoots
bud scale scars along side of twig: indicate where bud scales were located previously
leaf scars along side of twig: indicate where each leaf was previously attached to the stem
bundle scars at leaf scars: indicate where vascular tissues are located within the leaf scar
lenticels along the sides of twig: regions of gas exchange on the stem
bud scales covering the terminal bud: modified leaves
node: area of leaf attachment to stem
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A student observes a wormlike organism crawling about on dead organic matter. Later, the organism sheds its outer covering. One possibility is that the organism is a larval insect (like a maggot)
However, it might be a member of the phylum ________, and one way to distinguish between the two possibilities is by looking for the presence or absence of ________. A) Platyhelminthes; a cuticle of chitin B) Nematoda; an alimentary canal C) Annelida; a body cavity D) Nematoda; a circulatory system E) Annelida; muscle in the body wall
Which of the following individuals is considered to be the “Father of Microbiology”?
A) Anton van Leeuwenhoek B) Louis Pasteur C) Robert Koch D) Rudolf Virchow
The simplest nervous system found in nature is the nerve net. An example of an organism that senses and responds to its environment with this ancient system would be
A. a jellyfish. B. a cockroach. C. an earthworm. D. a frog. E. a fiddler crab.
In a microcosm experiment, Chris Steiner and colleagues showed that resilience was positively related to the number of species present, but only in __________-productivity microcosms.
A) low B) high