Answer:
<u>50%</u>
Explanation:
<em>Since</em> it was not a case of a Lettuce seed exposed first to <em>red light</em> and then to <em>far-red light</em> which will very likely not germinate because Pr (chromoprotein inactive form) absorbs red light efficiently, the light absorbed will convert a high proportion of the molecules to the Pfr (chromoprotein active form), thereby inducing germination. So there is a 50/50 percentage chance of of germination.
The correct answer is option B- sea anemone
Sea anemone belongs to group of marine animals, predator in nature. They belong to the phylum Cnidaria
Sea anemone has a foot like structure at the bottom which helps in attachment with rocks or anchor in sand but most of the species come near to the surface and float at the surface of water.
The most important and interesting factor about anemone is the presence of small tentacles around the mouth used to capture the prey.
The signaling molecule for flowering might be released earlier than usual in a long-day plant exposed to flashes of red light during the night.
Higher plants are sessile organisms that sense and respond to environmental stimuli such as light and chemical cues by changing their morphology.
The signaling pathway uses a complex network of interactions to coordinate biochemical and physiological responses such as flowering, fruit ripening, germination, photosynthetic regulation, and shoot or root development.
These signals are first recognized by receptors and transmitted through complex networks to the cell nucleus.
The signal is transduced to the nucleus by one of several systems involving GTP-binding proteins (G proteins) that change activity upon GTP binding, a protein kinase cascade that sequentially phosphorylates and activates various proteins and Membrane ion channels that alter the ionic properties of cells.
This signal is manifested in the nucleus as a change in the activity of DNA-binding proteins, transcription factors that specifically interact with and regulate the regulatory regions of genes.
Thus, detection of environmental signals is transmitted through transduction pathways, and changes in transcription factor activity can coordinate expression changes in gene portfolios to guide new developmental programs.
Learn more about signaling here : brainly.com/question/9381928
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Answer:
Explanation:
*organisms respire or decompose (decay), carbonate rocks are weathered, forest fires occur, and volcanoes
*In terms of this cycle, the decomposers metabolize oxygen and release carbon dioxide. The primary producers then use these nutrients to fuel photosynthesis, which provides oxygen for the consumers
*burning fossil fuels, changing land use, and using limestone to make concrete all transfer significant quantities of carbon into the atmosphere.
