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 pHs.
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
D
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Noncyclic electron transport needs a constant supply of electrons. These are obtained from:a
light. b. CO2. c. glucose. d. H2O. e. ATP.
How many strands does RNA have ?
A. Triple B. Double C. Single D. Both single and double
Which of the following statements about evolution is true?
A) Evolution can proceed to a limited extent without the occurrence of mutation. B) Evolution involves maintaining a constant frequency of alleles in the gene pool. C) Populations evolve. D) Individuals evolve.
The last universal common ancestor (LUCA) probably lived about 3.5 billion years ago
a. true b. false