HORTICULTURE SCIENCE
PLANT BIOLOGY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Pigments in photosystem II absorb light
|
|
|
ATP and NADPH are used to produce high-energy sugars
|
|
|
ATP synthanse allows H+ ions to pass through the thylakoid membrane
|
|
|
High-energy electrons move through the electron transport chain
|
Detailed explanation-1: –The light-dependent phase or photochemical phase is commonly called a light reaction.-Here the light energy is absorbed and converted into chemical energy resulting in the formation of ATP and NADPH and hydrogen ions. So, the correct answer is ‘NADH’.
Detailed explanation-2: -The synthesis of glucose occurs in stroma and this does not require light. Hence, the reaction for synthesis of glucose is a light-independent reaction.
Detailed explanation-3: -The ATP and NADPH from the light-dependent reactions are used to make sugars in the next stage of photosynthesis, the Calvin cycle. In another form of the light reactions, called cyclic photophosphorylation, electrons follow a different, circular path and only ATP (no NADPH) is produced.
Detailed explanation-4: -Which is not a step of the light independent reaction? Explanation: Absorption of sunlight in photosystem II is the first step of the light dependent reaction, not the light independent reaction. During the light independent reaction, or the Calvin Cycle, carbon fixation first occurs.
Detailed explanation-5: -Light dependent reaction involves four important stages – absorption of light energy, splitting of water molecules, release of oxygen, formation of energy carrying molecules – ATP and NADPH.