The question asks about the specific wavelength of light that the reaction center of Photosystem I (PSI) maximally absorbs. This is a fundamental concept in photosynthesis, specifically related to the light-dependent reactions.
C) 700 nm. The reaction center of Photosystem I is designated P700, indicating its maximum absorption at 700 nm.
The question asks about the final products of the light-dependent reactions of photosynthesis. Recall the two main stages of photosynthesis: light-dependent reactions and light-independent reactions (Calvin cycle). The light reactions convert light energy into chemical energy in the form of ATP and NADPH, and also produce oxygen as a byproduct.
Correct Option: A) ATP, NADPH and O₂
This option correctly lists all three primary products of the light-dependent reactions: ATP (energy currency), NADPH (reducing power), and O₂ (a byproduct from the splitting of water).
The Z-scheme describes the non-cyclic electron flow during the light-dependent reactions of photosynthesis. It involves two photosystems, PS II and PS I, and an electron transport chain. Understanding the sequence of electron transfer is key to answering this question.
Therefore, the overall flow of electrons is from PS II, through the electron transport chain, to PS I, and finally to NADP+.
Correct Option: D) PS II \(\rightarrow\) Electron transport chain \(\rightarrow\) PS I \(\rightarrow\) NADP\(\text{+}\)
This question asks about the components involved in cyclic photophosphorylation, a process during the light-dependent reactions of photosynthesis. We need to recall the key features of cyclic electron flow versus non-cyclic electron flow.
Correct Option: A) Photosystem I
This question asks about the location of the dark reactions (Calvin cycle) of photosynthesis. Photosynthesis is divided into two main stages: light-dependent reactions and light-independent reactions (dark reactions). Understanding where each stage occurs within the chloroplast is key to answering this question.
Correct Option: B) Stroma of chloroplast
The Calvin cycle, or dark reactions, takes place in the stroma of the chloroplast. This is where carbon dioxide is fixed and converted into glucose using the energy (ATP) and reducing power (NADPH) generated during the light reactions.
The question asks for the first stable product of CO₂ fixation in the C3 (Calvin) pathway. This requires knowledge of the initial reactions of the Calvin cycle, specifically the carboxylation phase.
Correct Option: A) 3-Phosphoglycerate (3-PGA) is the first stable three-carbon compound formed after the fixation of CO₂ by RuBP in the Calvin cycle.