A horizontal stem modified to penetrate the substrate and anchor a plant is a ____

a. sporangium
b. rhizome
c. vascular system
d. protonema
e. shoot system


ANSWER: b

Biology & Microbiology

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What is the organelle shown in this illustration?



a. plant cell
b. thylakoid
c. chloroplast
d. vacuole

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The hormone involved in childbirth that participates in a positive feedback loop is

1.estrogen. 2.progesterone. 3.somatostatin. 4.oxytocin. 5.vasopressin.

Biology & Microbiology

The central nervous system contains:a

all sympathetic nerves. b. all parasympathetic nerves. c. all sensory receptors. d. only the cerebrum and cerebellum. e. a brain and a dorsal tubular spinal cord

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During the first half of the menstrual cycle, GnRH stimulates the release of FSH, which stimulates the growth of follicle cells to secrete increasing levels of ________, which then stimulates the release of more GnRH, creating a positive feedback

loop. Fill in the blank(s) with correct word

Biology & Microbiology