Question #6dcaf

2 Answers
Mar 27, 2017

a process in which plants prepare their own food


photo means "light" and synthesis means "to make food". photosynthesis is the process in which plants use water and carbon dioxide released in the result of the process of respiration and chlorophyll to make food, oxygen and energy in the presence of sunlight..

water+carbon dioxide=oxygen+food+energy

Nov 14, 2017

Simple definition:
Photosynthesis is a process by which plants, green algae and other photosynthetic organisms having chloroplast or other photosynthetic machinery, synthesize their own food using sunlight as energy source.


Exact Biological definition:
Photosynthesis is a process in which energy-poor inorganic oxidized compounds of carbon(i.e #CO_2#) and hydrogen(i.e mainly #H_2O#) are reduced to energy-rich organic compounds i.e carbohydrates(sugars) using the sunlight energy that is absorbed and converted into chemical energy by chlorophyll and some other photosynthetic pigments.
This process can be summarized as:

#6CO_2 + 12H_2O + Light to C_6H_12O_6 + 6O_2 + 6H_2O#

Brief concept:
This process is basically divided into two steps i.e Light reactions and dark reactions (also known as Calvin cycle or #C_3# pathway).
During light reactions, the sunlight energy absorbed by photosynthetic pigments(present in thylakoid membranes) is converted into chemical energy of #ATP# and #NADPH#.
And then in dark reactions this chemical energy is used to produce sugars in stroma of chloroplast.

enter image source here wn food using the sunlight energy.

There are also some photosynthetic organisms without chloroplasts. For example: Photosynthetic prokaryotes lack all the membrane bounded organelles, so also lack chloroplast but they do perform photosynthesis. The reason is that they have unstacked photosynthetic membranes which work like thylakoids.

Hope it helps...