Question

what you know about photosynthesis, what do you think may occur given a change in the available light to plants on earth, where only the green and red wavelengths of light are available to plants? Include a bit of information about how light is used by plants for photosynthesis.

Answer 1

Solution

Photosynthesis :- Is the process by which green plant transform light energy into chemical energy.

Here light energy is captured by green leaves and converted to H2O ,CO2 and Glucose.

Rate of photosynthesis is affected by different wavelengths of light

The most abundant pigment in plant is chlorophyll -a .It absorb mainly blue light (wavelength =430nm) and red light (wavelength =662nm).and it appears green because it reflects green light strongly.

In case if only green and red wavelengths are aavailable.Plants will continue photosynthesis by using red light.and will appear green by reflecting green light.but due less sunlight photosynthesis will slowdown.

during photosynthesis one molecule of chlorophyll absorb one photon and releases one electron .this electron flows through electron transport chain and finally give rise to ATP and O2 molecule.

Net reaction of light dependent reaction

2 H₂O + 2 NADP⁺ + 3 ADP + 3 P_i + light -------> 2 NADPH + 2 H⁺ + 3 ATP + O₂