In the chemical equation for photosynthesis, carbon dioxide and water are converted to glucose and oxygen.
6co2 + 6h2o ® c6h12o6 + 6o2
which component could be added to complete this chemical equation?
a. light energy
b. atp and nadph
c. chemical energy
d. rubisco

Answer : The correct answer is -

A. light energy.

Photosynthesis is a process of formation of food (glucose) in green plants, algae, and some protist.

In this process, energy from sunlight is captured by chlorophyll (a green pigment present in the Chloroplast) in the presence of carbon dioxide and water and converted into chemical energy in the form of ATP and NADPH.

The energy from these chemical compounds is then used to form glucose.

Oxygen is released in the surrounding due to photolysis of water in this process.

Thus, the given chemical equation can be completed by adding light energy.

both anaerobic and aerobic respiration use glucose (or other carbohydrates), proteins and lipids to produce atp and nadh. cell uses those energy molecules, obtained from food and   breaks them down during the chemical reactions of respiration. in anaerobic respiration, nadh is regenerated to nad+ by enzymes lactate dehydrogenase (lactate is produced, e.g. in muscle cells) or by alcohol dehydrogenase where ethanol is produced (alcohol fermentation), while in aerobic respiration, electrons from nadh are deposited in the mitochondria to regenerate nad+ (electron transport chain. anaerobic respiration produces 2 atp per molecule of glucose compared to aerobic respiration where about 38 atp molecules are produced.