Female gametophytes develop specifically within what part of the flower?
A. anther
B. stamen
C. stigma
D. ovule
E. central cell
D. ovule
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Why are food chains relatively short?
A) Top-level feeders tend to be more numerous than lower-trophic-level species. B) Top-level feeders tend to be small but are capable of conserving more energy. C) Longer chains are less stable and energy transfer between trophic levels is inefficient. D) There are only so many organisms that are adapted to feed on other types of organisms. E) Food chain length is ultimately determined by the photosynthetic efficiency of producers.
Alkaloid drugs include
_____ LSD. _____ morphine. _____ caffeine. _____ nicotine. _____ THC.
Secretion of GnRH is inhibited by all EXCEPT
a. secretions from Sertoli cells. b. elevated testosterone levels. c. secretion of inhibin. d. normal sperm production. e. secretions from Leydig cells.
Which endocrine gland is the main center for control of the internal environment?
A. Pineal B. Hypothalamus C. Thyroid D. Adrenal cortex E. Thalamus