The chief function of root hairs is to
A) decrease the anchoring power of roots.
B) increase the surface area for efficient absorption of water and minerals.
C) provide a direct passageway from the soil to the vascular cylinder.
Answer: B
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According to the redundancy hypothesis, species are redundant if
A. they could be eliminated or replaced by others with no loss of ecosystem function. B. they have grown beyond their carrying capacity for a particular ecosystem. C. their ecological niche overlaps somewhat with another species. D. they have an effect on the ecosystem that is disproportionate with their abundance.
The widening of a tree trunk is mostly due to the activity of its
A. apical meristem. B. secondary phloem. C. vascular cambium. D. primary xylem
Which of the following is NOT an example of an energy transformation?
a) Formation of static electricity b) solar panels at work c) heating up dinner in a microwave d) All of these are energy transformations
In humans, one pair of pharyngeal pouches become the tube-shaped organ called the
A. trachea. B. esophagus. C. pharynx. D. bronchial tube. E. Eustachian tube.