Which of the following is required for photosynthesis to take place?
a. sugar
b. oxygen
c. atp
d. water

d. water

The photosynthesis is a natural phenomena that occur in the leaves of the plants. This process is required by the plants to produce their own food. The water, atmospheric carbon dioxide and sunlight are required as reactants to produce carbohydrates and oxygen as products.

Water is the correct option among all and other options like sugar, oxygen and ATP are the products of the photosynthesis. Water is required along with other reactants to produce these products.

The water, along with sunlight and carbon dioxide, is essential for photosynthesis to occur.

Further Explanation:

The photosynthesis occurs naturally in the leaves through which the plant prepares its food. During this process, the plants absorb light energy from the sun to convert carbon dioxide and water into energy-rich compounds and oxygen. A pigment called chlorophyll is present in the leaves, which helps in the absorption of light.

Photosynthesis occurs in two stages:

The light-dependent reactions involve two photosystems- PS I (P700) and PS II (P680), which helps in the sequential transfer of a pair of electrons from the excited chlorophyll molecule to an electron acceptor and so on. At the same time, water splitting occurs to produce free electrons along with hydrogen and oxygen. The free electrons are then accepted by the chlorophyll molecule to stabilize it. The process starts with PS II, which involves the transfer of electrons from chlorophyll to the electron acceptor and the simultaneous splitting of water. The electrons are passed on to a chain of electron acceptors till it reaches the PS I. The PS I further transfers electrons through a set of electron carriers and which are eventually accepted by NADP+ to form NADPH. While the electrons are being transferred from one carrier to another, the H+ ions are also pumped into the stroma, which drives the ATP production.

In the light-independent reactions or dark reactions, carbon from the atmosphere is fixed into the plants as carbohydrates. The ATP and NADPH are used as energy sources from the light reaction to facilitate the dark reactions.

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Answer Details:

Grade: High School

Chapter: Photosynthesis

Subject: Biology

Keywords:

Photosynthesis, light-dependent reactions, light-independent reactions, NADPH, ATP, oxygen, carbon dioxide, water, PS I, PS II, chlorophyll.