All living organisms respire in some manner. Plants always respire but don't always photosynthesize. This is why plants give out oxygen during the day and carbon dioxide at night.Continue Reading
Plants require energy to maintain the function of their cells, normally obtained through photosynthesis. However, photosynthesis does not do all of the work required with respiration required to convert the necessary minerals into glucose. Photosynthesis occurs in the chloroplasts of plant cells where carbon dioxide (from respiration) and water (drawn through roots) convert energy from the sun and chlorophyll into a substrate of glucose and oxygen. This action proves respiration is necessary for plant cells.
Placing a plant in a room with varying levels of light will prove that while the energy needed to photosynthesize is absent, the act of respiration continues An example of this can be seen in non-evergreen plants shedding their leaves in winter, during which they respire while feeding on glucose deposits stored within.
The act of respiration is not the same as breathing. According to the Merriam-Webster dictionary, respiration is "any of various energy-yielding oxidative reactions in living matter." Plants respire in two manners with photosynthesis yielding oxygen and without photosynthesis yielding carbon dioxide.Learn more about Science
One of the key purposes of the introduction to a science project is setting forth or outlining the purpose of the project in a clear, concise manner. The introduction summarizes how the science project is to work or proceed from start to finish. The intro must also delineate what results are expected through the project as well as how those results are to be analyzed or utilized.Full Answer >
A tropism is the manner in which a plant responds to an environmental stimulus, including light (phototropism), gravity (gravitropism) or touch (thigmotropism). Plants respond positively to some stimuli by moving toward them, and negatively to other stimuli by moving away from them.Full Answer >
Plant cells from an onion bulb lack chloroplasts because this part of the plant grows below ground, making it incapable of absorbing the light needed to photosynthesize. Most subterranean root and bulb structures in plants do not have chloroplasts for this reason.Full Answer >
A plant's guard cells regulate the opening and closing of the epidermal stomata by expanding or contracting in response to environmental signals. When a pair of guard cells surrounding a stoma receives the signal that the stomatal pore needs to open, the guard cell pair fill with water, changing the cell's shape and opening the pore. An inverse process occurs when the guard cells receive a signal to close the stoma, initiating a loss of water and causing them to shrink and close the pore.Full Answer >