Question

In photosynthesis, oxygen is produced by
A. Photosystem I from carbon dioxide.
B. Photosystem II from carbon dioxide.
C. Photosystem I from water.
D. Photosystem II from water.

Answer 1

Hint: In photosystem I, the electron comes from the transport chain of the chloroplast electron. In photosystem II, the electron is released by the division of water.

Complete answer: Photosystem I capture energy from sunlight.
Photosystem I use energy from light to motivate the electron, moving it in a difficult direction.
Then, as the electron is situated in such an active position, it can be used to do unfavorable activities, including the processing of sugar from carbon dioxide.
Photosystem II uses water as an electron donor to fill the hole left as the energized electron moves through the row.
When the electron is removed from the water molecule, the photosystem II separates the water and releases the oxygen gas. This reaction is the source of all the oxygen we breathe.

Additional information: Photosynthesis is the mechanism by which plants, some protists, and some bacteria use sunlight energy to generate sugar, which cell respiration transforms to ATP, the "food" used by all living organisms.
The conversion of unused sunlight energy into usable chemical energy is related to the action of green pigment chlorophyll.
Much of the time, the photosynthetic process involves water and releases oxygen that we desperately need to remain alive.

Thus, the right answer is option D. i.e., Photosystem II from water.

Note: There are two types of photosystem: photosystem I and photosystem II. Both photosystems contain several pigments that help to consume light energy, and also a special pair of chlorophyll molecules located in the middle of the photosystem.