Which cnidarian structures would be involved in mounting a defense against predation? Check all that apply.
_____ cnidocytes.
_____ nematocysts.
_____ cnidocils.
_____ gastrovascular cavity.
_____ mesoglea.
__X__ cnidocytes.
__X__ nematocysts.
__X__ cnidocils.
_____ gastrovascular cavity.
_____ mesoglea.
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Stomach motility
a. decreases following a heavy meal. b. controls the amount of material leaving via the pyloric sphincter. c. is unaffected by emotional state or external environmental factors. d. may be retarded when stretch receptors on the stomach wall are activated. e. is increased by hormones released in response to high stomach acidity.
An examples of a plant disease caused by an ascomycete is:
a. a microsporidial infection. b. stem rust of wheat. c. histoplasmosis. d. chestnut blight. e. corn smut.
What biome has a mean annual precipitation over 250 cm. with relatively little seasonal variation, and warm temperatures over 20°C?
A. tropical dry forest B. taiga C. temperate rain forest D. savanna E. tropical rain forest
All of the following are strictly necessary for infectious organisms infecting a host, EXCEPT:
A. Evasion of Host defences B. Multiplication and Spread C. Entry D. Disease E. Shedding from body