What adaptations should one expect of the seed coats of angiosperm species whose seeds are dispersed by frugivorous (fruit-eating) animals, as opposed to angiosperm species whose seeds are dispersed by other means?
1. The exterior of the seed coat should have barbs or hooks.
2. The seed coat should contain secondary compounds that irritate the lining of the animal's mouth.
3. The seed coat should be able to withstand low pH's.
4. The seed coat, upon its complete digestion, should provide vitamins or nutrients to animals.
5. The seed coat should be resistant to the animals' digestive enzymes.
A) 4 only
B) 1 and 2
C) 2 and 3
D) 3 and 5
E) 3, 4, and 5
A pteridophyte stem with tracheophyte adaptations for transporting and conserving water.
Species richness of birds in North America.
Two species of granivorous rodents living in the Chihuahuan Desert: (a) the kangaroo rat, Dipodomys
Invasive species in Canada include (a) zebra mussels, Dreissena polymorpha, (b) sea lamprey, Petromy
Tiger, the largest and heaviest living species of the cat family
Hydrozoan. Hydra, a freshwater species capturing and digesting a water flea.