Search results
Results from the WOW.Com Content Network
These historical impacts of climate change can improve human life and cause societies to flourish, or can be instrumental in civilization's societal collapse. The study seeks to define periods in human history where temperature or precipitation varied from what is observed in the present day.
Temperature is changed without a change of state. By contrast latent heat (hidden heat) results from a change of state without a change of temperature. For example as radiant energy warms a body of water it raises the temperature generating sensible heat. Water evaporated from the body of water changes state as latent heat. [17]
Knowing which plants were present leads to an understanding of precipitation and temperature, and types of fauna present. Palynology includes the study of pollen for these purposes. Volcanic ash is contained in some layers, and can be used to establish the time of the layer's formation.
Paleobotany, also spelled as palaeobotany, is the branch of botany dealing with the recovery and identification of plant remains from geological contexts, and their use for the biological reconstruction of past environments (paleogeography), and the evolutionary history of plants, with a bearing upon the evolution of life in general.
Increasing the temperature of the reproductive organs in plants results in more frequent visitations from pollinators and an increase in the rate of metabolic processes. [7] Factors that affect the capture and maintaining of heat in plants include flower orientation, size and shape, coloration, opening and closure, pubescence, and thermogenesis .
The enzyme RuBisCO is responsible for "fixing" CO 2 – that is, it attaches it to a carbon-based molecule to form a sugar, which can be used by the plant, releasing an oxygen molecule along the way. However, the enzyme is notoriously inefficient, and just as effectively will also fix oxygen instead of CO 2 in a process called photorespiration .
In 1804, Nicolas-Théodore de Saussure's (1767–1845) Recherches Chimiques sur la Végétation was an exemplary study of scientific exactitude that demonstrated the similarity of respiration in both plants and animals, that the fixation of carbon dioxide includes water, and that just minute amounts of salts and nutrients (which he analyzed in ...
This decision is based on factors like temperature, light intensity, presence of pollinators and other environmental signals. In Arabidopsis thaliana it is known that genes like CONSTANS (CO) , FRIGIDA , Flowering Locus C ( FLC ) and FLOWERING LOCUS T (FT) integrate the environmental signals and initiate the flower development pathway.