4. the word “which” in line 10 refers to
(a) the responses of plants to climate changes
(b) the current theories of ecosystems
(c) the developments of ecosystems
(d) plant life changes

5. the word “axis” in line 12 is closest in meaning to
(a) center
(b) method
(c) change
(d) slowdown

6. the word “successive” in line 19 is closest in meaning to
(a) exng us that we should be thinking about preserving species by giving them room to matinct
(b) consecutive
(c) accumulative
(d) following

7. the passage states that by drilling into the lake bottom it is possible to find successive fossils of:
(a) sediment
(b) ice
(c) plant life
(d) pollen

8. which of the following can be inferred from the passage
(a) –that the migratory patterns of plants are dependent upon changes in climate
(b) –that modern conservation methods should consider the migratory patterns of plants
(c) –that current associations of plants are similar to those in the past
(d) –that another ice age is likely to occur at some time

9. according to the passage, the movement of individual species of plants
(a) occurs in groups
(b) often depends upon the formation of lakes
(c) does not occur in groups
(d) depends upon climate and soil conditions

10. all of the following are true except
(a) the ice age occurred when small changes affected the movement of the earth
(b) fossil records seem to indicate that plants will be preserved if theyhave sufficient room to move
(c) fossil records clearly show that entire groups of plants are unlikely to have moved together
(d) in the ice age glaciers covered the world to depths of up to two miles