Question

51) Scientists have evidence to support the idea that monocots evolved prior to eudicots. Which statement does not support that monocots were first? A) Monocots are simpler B) Monocot fossils are older C ) fossilized eudicot pollen on fossilized insects C 52) Angiosperms are more numerous than gymnosperms yet angiosperms arose later. What accounts for angiosperm success? A) Nature intended it that way B) Evolution caused flowers to disseminate C) Pollination and internal fertilization are very successful D) Fruits and flowers are well loved and thus cultivated world wide by animals 53) Dr Denise read in Science News that due to ocean warming as much as 50% of the phytoplankton in some oceans has been lost. Phytoplankton are mixotrophs, consuming bacteria from the water and photosynthesizing. The bacteria they prefer can't tolerate the warming oceans. Why can't the phytoplankton drop deeper to find the bacteria? A) phytoplankton are not motile B) deeper underwater photosynthesis would fail C) the bacteria would just move lower to escape D) phytoplankton can't tolerate cold water 54) The plasmodial slime molds has been studied extensively by researchers because A) the signalling involved in aggregation is conserved in multicellular organsims B) the colorful forest floor slime molds are important producers in the environment C) plasmodial slime molds are considered a potential medicine source D) overgrowth of these protists degrades water quality and leads to global warming 55) Protists are primarily unicellular, but some are closely linked to multicellular organsims? Which is the furthest (evolutionarily) from multicelled eukaryotes? A) Excavata B) SAR C) Archaeplastids D) Unikonts

Answer 1

51. The assertions that monocots are simpler and their fossil is older only indicates their origin before the eudicots. However recently discovered fossilized eudicot pollen on fossilized insects is proved to be older than monocot evolution and origin. So the correct answer is (C).

52.All the options given here for the success of angiosperms are partially true. They are better pollinated, attractive colours tend to attract more insects and there is a high chance of fertilization every time. Moreover angiosperms are loved by humans and are cultivated so much. Functionally, the most important aspect of success is (C) pollination and internal fertilization are very successful.

53. phytoplanktons inhabit the upper surface of the ocean because of availability of light for photosynthesis, which won't be possible in deeper ocean. So the correct answer is (B) deeper underwater photosynthesis would fail.

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