What major evolutionary innovation makes ferns different from their ancestors?
a. embryos encased in seeds
b. the production of pollen
c. flowers
d. the alternation between haploid and diploid generations
e. vascular tissue
Answer: e. vascular tissue
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The ripening of fruit and the dropping of leaves and fruit are principally controlled by _____
A) auxins B) cytokinins C) indole acetic acid D) ethylene E) carbon dioxide concentration
Assuming it doesn't die unexpectedly, how often would you need to replant an annual plant?
A. Every year B. Every season C. Every two years D. Never, the plant will keep on growing
The accompanying figure represents Lack's hypothesis on clutch size. According to this hypothetical data, ________
A) the probability of survival for individual nestlings decreases linearly with each successive increase in the clutch size B) the probability of survival for individual nestlings increases, then decreases with each successive increase in the clutch size C) the optimal clutch size in terms of survival rates is intermediate D) A and C are both true. E) All of the above are true.
Extraembryonic membranes develop in
A) mammals, but not birds or lizards. B) birds, but not mammals or lizards. C) lizards, but not mammals or birds. D) mammals and birds, but not lizards. E) mammals, birds, and lizards.