1.explain the relationship between the light reactions and the calvin cycle in photoautotrophs. 2.what is the function of the magnesium atom in a chlorophyll molecule? 3.where do replacement electrons come from in photosystem ii? 4.diagram the flow of an electron from photosystem ii to eventually winding up in a molecule of nadph. 5.explain how atp is produced in photosynthesis. 6.why are plants green in color? 7pare and contrast cyclic and non-cyclic photophosphorylation. include the products of each and the fates of those products. 8.why is water necessary for photosynthesis? 9.why is oxygen produced during the light reactions?

Respuesta :

Photosynthesis is a process during which plants synthesise sugar using chlorophyll molecule and further this chlorophyll molecule along with mitochondria uses the sugar and convert it to energy molecule ATP.

1. The Calvin cycle receives ATP and NADPH from the light reactions and gives back ADP, Pi, and NADP+ to the light processes.

2. A magnesium ion stabilises the chlorophyll molecule at the core of the porphyrin ring and sends electrons down an electron transport chain to power the photosynthetic reaction.

3. water

4.  Light hits PS2 and pigment molecule absorbs energy and gets excited to release electron. The electron is taken by the primary electron acceptor. Enzyme separates water into H+ (the two electrons) and O-, and supplies p680 with the electrons (strong oxidising agent). H+ is discharged into the thylakoid space, and oxygen from a split water molecule joins with another oxygen to produce O2.Photoexcited electrons travel from PS2 to PS1 through ETC. In PS1, electrons move to a lower energy level, supplying ATP with energy. As they descend, their energy pumps H+ into the chemiosis-related thylakoid luman. The electron in PS1 reaction complex P700 is excited by light energy that has been transferred there. After the electron passes through a second ETC, NADP+ reductase adds an electron, converting NADP+ into NADPH.

5. ATP synthase generates ATP by facilitating the flow of electrons back into the stroma.

6. Instead of absorbing green light, chlorophyll absorbs red and blue light. green light reflects

7. When the electrons from PS1 go to the ETC and produce ATP before returning, it is considered cyclic (no water required). Noncyclic occurs when NADP+ is converted to NADPH by NADP-reductase using electrons transferred from PS1 to PS2.

8. It serves as the sugar's supply of hydrogen.

9. After light energy splits water, the waste product, oxygen, is released into the atmosphere.

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