Without enough light, a plant cannot photosynthesise very quickly, even if there is plenty of water and carbon dioxide. Increasing the light intensity will boost the speed of photosynthesis.
Sometimes photosynthesis is limited by the concentration of carbon dioxide in the air. Even if there is plenty of light, a plant cannot photosynthesise if there is insufficient carbon dioxide.
Plants need air, light, warmth, water and nutrients to be healthy. If they are healthy, they can continue making their own food through photosynthesis. The roots, leaves and the stem of a plant have different functions that help to keep it healthy.
Farmers can use their knowledge of these limiting factors to increase crop growth in greenhouses. They may use artificial light so that photosynthesis can continue beyond daylight hours, or in a higher-than-normal light intensity. The use of paraffin lamps inside a greenhouse increases the rate of photosynthesis because the burning paraffin produces carbon dioxide, and heat too.
Photosynthetic reactions occur in the grana and stroma of chloroplasts.
Thylakoids of grana are the sites for light reactions of photosynthesis.
Drawing upon recent work with photosynthetic bacteria, evidenceis presented as to how the carotenoids are organized within bothportions of the photosynthetic unit (the light harvesting antenna andthe reaction centre) and how they discharge both their functions.
The above sketch depicts the setting of Photosystem I in the which provides energy resources for the Calvin cycle.Photosystem I is the light energy complex for the used in some photosynthetic prokaryotes.The protein complex that constitutes Photosystem I contains eleven , six of which are coded in the nucleus and five are coded in the .
While oxygen is necessary for the process of respiration, glucose plays a crucial role in the diet; and that explains why the photosynthesis is important for all the lifeforms on the planet - including humans.
In PS I, the electrons are again excited by harnessing the energy from photons, and the reduction of NADP to NADPH2 is achieved by utilizing electrons and protons.
Stroma is the site for the dark or light-independent reactions of photosynthesis.
They serve as accessory light harvesting pigments,extending the range of wavelengths over which light can drivephotosynthesis, and they act to protect the chlorophyllous pigments fromthe harmful photodestructive reaction which occurs in the presence ofoxygen.