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.
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
Animal cells contain structures such as lysosomes and centrioles that plant cells do not. Animal cells are also generally smaller and have more variety in shape than do plant cells.Full Answer >
The main difference between plant cells and animals cells is that plant cells possess a cell wall and animal cells do not. Animal cells have an irregular shape, and plant cells have a fixed, rectangular shape.Full Answer >
Plant cells differ from animal cells in three major ways: their components, their function and the structures they build. Plant cells are typically more rigid than animal cells; they do not move, and they are able to synthesize all the chemical compounds needed by the organism. Animal cells must receive at least some of their nutrients from an outside source.Full Answer >
Plant cells do have mitochondria. Mitochondria are capsule-shaped organelles that float freely around the cells and provide it with energy. The energy comes from the nutrients the cell takes in and burns for fuel.Full Answer >