28. Which type of plants keeps their stomata open at night, but closed in the day?
(A) C3
(B) C4
(C) CAM
(D) C3 and C4
(E) C4 and CAM

24. Populations are best defined as _____. (A) all members of a species (B) all organisms found in an environment (C) families (D) metacommunities (E) groups of interbreeding individuals

25. Which is NOT a feature of habitat destruction? (A) swamp drainage (B) deforestation (C) strip mining (D) overharvesting (E) river channelization

26. Hamilton's Rule is a calculation of the strength in a population of _____. (A) sexual selection (B) group selection (C) natural selection (D) genetic relatedness (E) kin selection

27. What is a major consequence for plants and animals if current predictions of global warming are accurate? (A) Rates of natural selection will increase at the same pace. (B) New continental land masses will appear. (C) Water will be more widely available for plants and animals. (D) Anticipated changes in climate will occur faster than many organisms can move or adapt. (E) Many plants and animals will become smaller.

29. If x is the extinction rate of populations in patches per unit time and m is the rate of movement between patches, then, according to Richard Leurs, the proportion of occupied patches in a metapopulation will stabilize over time to _____. (A) x/m (B) 1 + (x/m) (C) 1 – (x/m) (D) 1/(x/m) (E) (1+x)/m(本題送分)

30. Allelopathy is _____. (A) interference competition (B) the secretion of toxins into the environment by plant roots (C) intraspecific competition (D) the transmission of viruses from deer to rabbits (E) the death of one species from diseases transferred from a second species

31. What is NOT a hypothesis to explain why seed dispersal is so advantageous to plants? (A) Competition avoidance (B) Predator escape (C) Colonization (D) Indirect dispersal (E) Directed dispersal

32. If fertilization occurs, the hormone____, which mimics the hormone _____, is produced by the_____. (A) prolactin, estradiol, anterior pituitary (B) oxytocin, estradiol, anterior pituitary (C) inhibin, progesterone, uterus (D) hCG, FSH, uterus (E) hCG, LH, placenta

33. Which of the following statements concerning excretory system is FALSE? (A) Urea can be processed by filtration, reabsorption, and secretion during the process of urine formation. (B) Kidney contributes pH balance in body fluid. (C) Ascend limb of the loop of Henle is the site for reabsorption of water. (D) Proximal tubule is the major site for reabsorption of nutrients. (E) The final concentration of the urine is determined in the collecting duct.

34. The plant hormone that inhibits growth and promotes leaf senescence is _____. (A) abscisic acid (B) auxin (C) cytokinin (D) gibberellin (E) strigolactone