48. A hummingbird with a beak that is too short to pollinate a flower is an example of (A) behavioral isolation. (B) temporal isolation. (C) gametic isolation. (D) mechanical isolation. (E) postzygotic isolation.

52. Which of the following is true? (A) The leaves of both angiosperms and gymnosperms are covered by a waxy cuticle that helps to protect the leaves from desiccation. (B) Both angiosperms and gymnosperms produce ovules in a specialized structure called an ovary. (C) “Double fertilization” to produce a fertilized egg and a triploid endosperm is characteristic of both angiosperms and gymnosperms. (D) The gametophyte is the dominant generation in both the angiosperms and gymnosperms. (E) All of the statements are true.

48. A hummingbird with a beak that is too short to pollinate a flower is an example of (A) behavioral isolation. (B) temporal isolation. (C) gametic isolation. (D) mechanical isolation. (E) postzygotic isolation.

其他試題

48. A hummingbird with a beak that is too short to pollinate a flower is an example of
(A) behavioral isolation.
(B) temporal isolation.
(C) gametic isolation.
(D) mechanical isolation.
(E) postzygotic isolation.