Ranasaymon wrote:
1. According to the author, pollen grains that would have the greatest dispersal range would have which of the following characteristics?
...the pollen grains of wind-pollinated plants are smooth and dry, to avoid clumping and precipitating,
The rate at which pollen settles is dictated principally by the size and density of the grain. The slower the settlement rate, the greater the dispersal range. Numerous species reduce the density of pollen grains with air cavities in their walls.There is a limit, however, to the lower range of pollen size. ( greatest dispersal is related with small size and low density)
I. Small size
II. Dryness
III. Low-density
A. I only
B. II only
C. I and II only
D. I and III only
E. I, II, and III
2. If rainfall levels in a particular growing season were abnormally high, it is most reasonable to conclude, based on the passage, that the
Pollen release is often tied to the recognition of unambiguous environmental clues; thus, many plants will not release pollen when wind speeds are low or while humid conditions exist,
A. amount of pollen released by wind-pollinated species would be less than normal because of sophisticated mechanisms tied to environmental clues -> More rain-> humid condition-> less pollen release
B. amount of pollen released by wind-pollinated species would be greater than normal to compensate for the greater resulting pollen loss
C. pollen-to-ovule ratios of wind-pollinated species would be unaffected by the change in weather
D. amount of seed produced and released by wind-pollinated species would be greater than normal
E. amount of pollination carried by insect pollinators would remain unchanged
3. According to the passage, all the following mechanisms serve to reduce pollen loss in wind-pollinated plants EXCEPT:
A. development of a large specially shaped stigma -> mentioned in the last part of the first paragraph
B. retention of pollen within the male organ when weather conditions are not conducive to dispersal -> There is nothing about male organ in the passage
C. growth of plants in large populations with few species ->mentioned in the last part of the first paragraph
D. development of intricate mechanisms to prevent self-pollination -> mentioned in the last part of the second paragraph
E. efficient design of the airborne pollen grain -> mentioned in the middle part of the second paragraph
4. The author’s attitude towards textbooks that describe wind pollination as “primitive” is best described as one of
While wind pollination is usually considered a “primitive” feature by textbooks, recent research has, in fact, shown that several remarkably sophisticated mechanisms for dispersal and capture are characteristic of wind-pollinated plants.
A. reasoned rejection
B. tempered uncertainty (No uncertainty, there is direct contrast present in second paragraph)
C. vehement disagreement ->Extreme
D. mild displeasure
E. complete support -> Completely opposite
Between options A and D, I choose option A, as the use of different tone in second paragraph shows us contrast.
I still feel that in 3rd question, option D is the most suitable because "development of intricate mechanisms to prevent self-pollination" is used just as an example of an intricate mechanism while on the other hand there is a statement in the passage that says the pollens are released only when the conditions are conducive. Also there is an instance in the passage where it states "plants moved male sex cells",
That is why I have my fair share of doubts on option B.