Part A The mass extinction of dinosaurs after a giant asteroid collided with the earth 66 million years ago was linked to a massive decline in plant life. What critical input for photosynthesis was dramatically reduced after the asteroid impact and resulting fires? View Available Hint(s) sugar oxygen water thylakoids sunlight carbon dioxide Submit Provide Feedback
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Step 1: The question asks about a critical input for photosynthesis that was dramatically reduced after the asteroid impact and resulting fires, leading to a decline in plant life. Show more…
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7. Numerous hypotheses have been proposed for the extinction of the dinosaurs. Recently, evidence has been found of the impact of a large meteor at about the time of this mass extinction. The amount of dust and debris put into the atmosphere upon impact, as well as atmospheric heating, would have been enormous. Using your knowledge of photosynthesis, speculate as to why the dinosaurs subsequently became extinct. 8. Explain the statement: "Without autotrophic organisms, heterotrophic life would cease to exist." 9. Why do you suppose that a chloroplast kept in darkness for some time prior to being fixed for electron microscopy does not contain starch? 10. With the results of the preceding experiments in mind, what might you do to increase the vigor of your house plants?
Adi S.
Many factors, started by the asteroid impact, led to the extinction of the dinosaurs. However, the deadliest factor was the mass die-off of plants due to acid rain the mutant alien bacteria the volcanoes the earthquakes
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The history of life has been punctuated by several mass extinctions. For example, the impact of a meteorite may have wiped out most of the dinosaurs and many forms of marine life at the end of the Cretaceous period. Fossils indicate that plants were less severely affected by this mass extinction. What adaptations may have enabled plants to withstand this disaster better than animals?
Madhur L.
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