Why do oils form a significant part of the nutritional reserves in many seeds?
A. The oils reduce the density of the seed and allow for water dispersal.
B. Oils store twice as much energy as an equivalent mass of starch.
C. Hormones diffuse more quickly through oils.
D. Oils help keep the embryo hydrated, allowing the seed to survive in dry habitats.
E. Oils contain more mineral nutrients than carbohydrates.
Answer: B
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What is the most ecologically important animal in the ocean in terms of habitat formations?
a. Sea anemones b. Ctenophores c. Jellyfish d. Coral polyps
The mutation labeled as 1 to the far right in the accompanying figure represents:a
legs developing where antenna should be. b. appendages of the eyes.
c. enlarged antennae. d. newly formed structures to remove pollen or dust from the eyes. e. a revision of the fly body so that legs and antenna have switched places.
Why do areas of upwelling tend to have large and diverse populations of organisms?
A) Upwelling moves dinoflagellates to the aphotic zone. B) Upwelling brings nutrient-rich water up from the ocean depths. C) Upwelling brings aphotic organisms to the ocean surface. D) Upwelling lowers the level of oxygen in the water. E) Upwelling mixes deep-ocean fresh water with salt water from rivers.
Sodium chloride (NaCl) crystals (table salt) form as a result of:
A) hydrogen bonding. B) being chemically stable. C) covalent bonding. D) the attraction of oppositely charged particles for each other.