Pollen grains are formed in ________ and ova are formed in ________.
A. receptacles; peduncles
B. petals; corolla
C. sepals; calyx
D. stamens; carpels
E. pistil; stamens
Answer: D
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The plant hormone involved in aging and ripening of fruit is _____
A) auxin B) ethylene C) florigen D) abscisic acid E) gibberellin
Answer the following statement(s) true (T) or false (F)
1. There is only a single type of pain receptor. 2. Hormones must be present at high concentrations to elicit an effect. 3. A molecule can act as both a neurotransmitter and a hormone. 4. The brain controls organ system function only through direct contact with sympathetic or parasympathetic nerves. 5. The thyroid requires negative feedback to prevent overgrowth.
Whole-cell movements involve the coordinated activity of
a. microtubules. b. microfilaments. c. blastomeres. d. microtubules and microfilaments. e. microtubules and microfilaments and blastomeres.
The remaining energy in the producer level that is available for consumers is the
A. gross primary consumption. B. net primary consumption. C. gross primary production. D. net primary production.