16. Some heterokonts (stramenophiles) are photosynthetic and gained their chloroplasts by:
(A) primary endosymbiosis with a photosynthetic cyanobacterium.
(B) primary endosymbiosis with a photosynthetic glaucophyte chloroplast.
(C) secondary endosymbiosis with a green alga.
(D) secondary endosymbiosis with a red alga.

(E) secondary endosymbiosis with a dinoflagellate.

12. Chronically high levels of glucocorticoids can result in obesity, muscle weakness, and depression, a combination of symptoms called Cushing's syndrome. To determine which gland has abnormal activity in a particular patient, doctors use the drug dexamethasone, a synthetic glucocorticoid that blocks ACTH release. Based on the graph, identify which gland is affected in patient X, whose ACTH level in blood is effectively lowered by dexamethasone.(A) Adrenal medulla(B) Adrenal cortex(C) Anterior pituitary(D) Posterior pituitary(E) Thyroid gland

13. In 1935, Konrad Lorenz observed that ducklings learn to follow real or foster parents at a critical stage soon after hatching. The process, called _________, involves visual and auditory stimuli from the parent object； these elicit a response in the young that affects their subsequent adult behavior. (A) classical conditioning (B) imprinting (C) innate behavior (D) social learning (E) spatial learning

14. Allopatric populations of Geospiza fuliginosa and G. fortis (Darwin's finches) on different islands have similar beak morphologies. However, when the two species are sympatric on the same island, G. fuliginosa has a shallower, smaller beak, and G. fortis has a deeper, larger beak. These changes in beak morphology allow sympatric populations of Darwin's finches avoiding competition for food. This is an example of _________. (A) adaptive radiation (B) Batesian mimicry (C) character displacement (D) Müllerian mimicry (E) reinforcement

15. Significant sexual dimorphism is often found among bird species. Among the European flycatchers of the genus Ficedula, females select their mates based on the appearance of the conspecific male. Males look similar in allopatric populations of Ficedula hypoleuca and F. albicollis (European flycatcher). However, in the sympatric populations, males of the two species look very different. In experiments, females do not select males of other species when selecting between males from sympatric populations. However, they frequently make mistakes when selecting males from allopatric populations. This is an example of_________. (A) adaptive radiation (B) Batesian mimicry (C) character displacement (D) Müllerian mimicry (E) reinforcement

17. In fungi, coenocytic hyphae lack:(A) chitin.(B) microtubules.(C) flagellated cells.(D) septa.(E) rhizoids.

18. Which of the following bryophyte structure is haploid?(A) foot.(B) protonema.(C) seta.(D) embryo.(E) capsule.

19. A sorus is a:(A) group of sporangia on the upper side of a fern leaf.(B) group of sporangia on the underside of a fern leaf.(C) group of sporangia along the edge of a fern stem.(D) single sporangium on the underside of a fern leaf.(E) group of fern spores.

20. The mature female gametophyte is called a(n):(A) embryo sac.(B) nucellus.(C) megasporangium.(D) endosperm.(E) ovule.

21. Which of the following statements concerning primary meristems is FALSE?(A) An example is the suspensor.(B) An example is the procambium.(C) An example is the ground meristem.(D) They are formed during embryogenesis.(E) They are meristematic.

22. If a plant produces leaves that are oriented horizontally, which of the following might you expect to find ingreater abundance on the upper side relative to the lower side?(A) stomata.(B) cuticle.(C) spongy mesophyll.(D) epidermal cells.(E) veins.