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(a) Describe how populations in an ecological community depend on one another for energy supplies. (b) Explain the endosymbiotic origin of organelles in plant cells. (c) Analyse how a flowering plant and its animal pollinator benefit from their interaction.
Two groups of migratory songbirds normally use different routes. In a constructed experiment, their eggs hatch in captivity and the young are reared without parental contact or exposure to migrating adults. During their first migratory season, each bird’s…
Which geological change is consistent with oxygen-producing photosynthesis becoming established on early Earth? A. A rock layer containing nitrogen proves the first use of chlorophyll B. Every carbonate deposit records the first terrestrial forest C. Formation…
(a) Describe how populations in an ecological community depend on one another for energy supplies. (b) Explain the endosymbiotic origin of organelles in plant cells. (c) Analyse how a flowering plant and its animal pollinator benefit from their interaction.
Two groups of migratory songbirds normally use different routes. In a constructed experiment, their eggs hatch in captivity and the young are reared without parental contact or exposure to migrating adults. During their first migratory season, each bird’s…
The table contains model genome sizes for four organisms. Which conclusion is supported? Organism | Genome size / million base pairs Bacterium | 4.6 Insect | 190 Mammal | 2800 Flowering plant | 92000 A. The plant must have exactly thirty times as many…
(a) Outline how new heritable traits can arise and become more common in a population over time. (b) Explain how polyploidy can cause the abrupt origin of a new plant species. (c) Suggest advantages of scientific species names.
In a model experiment, odorant is applied either to the cilia or to the main body of an olfactory receptor cell at time zero. Distinguish between the two current responses.
The table contains model genome sizes for four organisms. Which conclusion is supported? Organism | Genome size / million base pairs Bacterium | 4.6 Insect | 190 Mammal | 2800 Flowering plant | 92000 A. The plant must have exactly thirty times as many…
(a) Outline how new heritable traits can arise and become more common in a population over time. (b) Explain how polyploidy can cause the abrupt origin of a new plant species. (c) Suggest advantages of scientific species names.