Which statement related to gymnosperm reproduction is true?
A) Spores produce pollen grains, which contain sperm.
B) Two sperm are required to fertilize the ovule.
C) Many gymnosperms rely on insects for pollination.
D) Gymnosperm reproduction is so inefficient that gymnosperms do not grow very tall or live for very long.
A
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The chronic inflammatory process involving the gums and tissues around the teeth is called
A. dental caries. B. periodontal disease. C. dental plaque. D. root caries.
Which cells of the pancreas produce glucagon?
a. alpha cells b. beta cells c. delta cells d. F cells e. gamma cells
In a songbird species, defending a territory saved the bird 584 calories a day in reduced foraging activity, but cost the bird 656 calories in defense of the territory. Is defending the territory consistent with the prediction from optimal foraging theory, and what can explain this?
A. Yes, because a bird of this species will minimize predation risk by defending the territory. B. No, but there may be non-nutritional benefits to defending territory. C. No, so it is likely that the researcher made a mistake in data collection. D. No, so that demonstrates that optimal foraging theory is not useful. E. Yes, because the bird will save 72 calories per day due to defending the territory.
Suppose you have two small plants. You cut the roots off of one and then place both plants in a jar of red dye. After 20 minutes, the roots, stem, and leaves of the plant with roots have turned pink. The plant without roots has not changed color at all
Why has the plant without roots remained a normal, green color? A) Cutting the roots has damaged the xylem, so the plant can no longer take up water. B) Cutting the roots has damaged the phloem, so the plant can no longer take up water. C) Cutting the roots has damaged the apical meristem, so the plant can no longer take up water. D) Cutting the roots has damaged the sporangia, so the plant can no longer take up water.