As continued from class, every food we eat , only 10% of it is being transferred and the rest is been used up for respiration and other things to make you survive. There are two types of respiration process. one is called AEROBIC while the other is called ANAEROBIC.
Aerobic is repiration in the presence of oxygen.
Anaerobic is also repiration but without the presence of oxygen.

ARE PLANTS ABLE TO SURVIVE IN DARKNESS WITHOUT LIGHT?
our theory:
Yes, plants are able to survive.
Better theory together with evidence:
Plants normally use light to produce food via photosynthesis. Plants also use
cues from the amount and type of light to control developmental processes
(such as production of pigments, germination, flowering, etc). Most plants
can be induced to live in the dark if given a source of carbon (such as
sucrose, a sugar) in their water. However, the plants probably won't develop
normally if kept totally in the dark.

Among naturally occurring plants, two immediately come to mind which do not
need light for food production. One is a saprophyte (feeds on dead plant
material) called Indian pipes and grows in woodlands. It looks like a
fungus but has flowers! Another is a parasite called dodder which also has
no green color because it gets nourishment from living plants. I saw both of
these plants during a trip to the North Carolina mountains, but they are widely
distributed. I have also worked with a single-celled plant called Chlamydomonas
which can grow in the dark if given a carbon source, and even turn green, since
it has a light-independent chlorophyll synthesis pathway.

So there are plants which can grow without light, but even they probably will
need some light to develop normally.