Question

Plants perform photosynthesis because Othey directly fuel all their cells with the high energy molecules (ATP, NADPH) that are energized during the light reactions. they have to create high energy molecules and then they send these molecules to all the parts of the plant that don't photosynthesize (like the roots) o they capture the light energy as ATP and NADPH and then use that energy to form sugar which in turn can be stored or transported to places that need more energy. O none of the above.

Answer 1

Answer :- "c" i.e They capture the light energy as ATP and NADPH and then use that energy to form sugar which in turn can be stored or transported to place that need more energy.

Explanation :- Photosynthesis is the biosynthesis of simple sugars ( glucose and fructose ) in chloroplast using H2O and CO2 in the presence of sunlight.

Photosynthesis occur in plant in two step namely i. Light reaction.

ii. Dark reaction.

i. Light reaction :-

a. Light reaction occur in grana .

b. Here the light energy is absorbed by the chlorophyll.

c. This light energy splits water molecules into H+ ions ,O2 and electrons by photolysis.

d. Then the electrons are transported through a series of electron carriers present in thylakoid membrane.

e. This electron transport produces reduced nucleotide adenosine di-phosphate (NADPH2) and ATP.

f. The NADPH2 and ATP are used for dark reaction.

ii. Dark reaction :-

a. Dark reaction occur in the stroma of chloroplast.

b. Dark reaction is the synthesis of sugars in the chloroplast by the Co2 reduction without influence of light.

c. In the dark reaction glucose is synthesized from Co2 by using ATP and NADPH2.

d. This glucose actually stored and transported to other parts of plant.

General equation :-

6Co2 +12H2O= C6H12O6 + 6H2O+ 6O2

So on the basis of above mentioned explanation the answer is C.