AP BIOLOGY

PHOTOSYNTHESIS

THE CALVIN CYCLE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which of the events listed below occur in the light reactions of photosynthesis?
A
NADP is produced.
B
NADPH is reduced to NADP+.
C
Carbon dioxide is incorporated into PGA.
D
Light is absorbed and funneled to reaction-center chlorophyll a.
Explanation: 

Detailed explanation-1: -Light is absorbed by various pigments and funnelled to the chlorophyll molecule at the reaction center. This leads to the flow of electrons through the ETC, splitting of water and the formation of ATP and NADPH.

Detailed explanation-2: -The three episodes that occur during the photosynthesis cycle are: Light energy is absorbed by chlorophyll, which breaks down water molecules into oxygen and hydrogen. Light energy is converted into chemical energy. The reduction of carbon dioxide leads to the formation of carbohydrates.

Detailed explanation-3: -In the first part of photosynthesis, the light-dependent reaction, pigment molecules absorb energy from sunlight. The most common and abundant pigment is chlorophyll a. A photon strikes photosystem II to initiate photosynthesis.

Detailed explanation-4: -In the light-dependent reactions, which take place at the thylakoid membrane, chlorophyll absorbs energy from sunlight and then converts it into chemical energy with the use of water. The light-dependent reactions release oxygen as a byproduct as water is broken apart.

There is 1 question to complete.