Concept Check 2
Answer the following questions
1. Name the alternative terms given to light independent reaction.
2. What happens during photolysis of water?
3. Where does light reaction occur in the chloroplast?
4. Why is dark reaction called so?
5. What is the source of oxygen produced during photosynthesis?
6. Write the overall chemical equation of photosynthesis.
7. Name the substance in the above equation which is repeated in raw material as well as the end-products.
Answers
1)Once in the mesophyll cells, CO2 diffuses into the stroma of the chloroplast, the site of light-independent reactions of photosynthesis. These reactions actually have several names associated with them. Other names for light-independent reactions include the Calvin cycle, the Calvin-Benson cycle, and dark reactions.
2)The rest of the energy is used for photolysis of water. Photolysis is the process by which water is split into oxygen, which is released into the atmosphere, and hydrogen. The hydrogen then becomes bonded to the coenzyme NADP to form NADPH and is transferred to the Calvin Cycle along with ATP.
3)thylakoid discs
The chloroplast is involved in both stages of photosynthesis. The light reaction takes place in the thylakoid discs. There, water (H20) is oxidized, and oxygen (O2) is released. The electrons freed up from water are transfered to ATP and NADPH
4)The Calvin cycle is also called the dark reactions or light-independent reactions because it's the part that doesn't need energy from the sun to happen. ... So although the cycle itself doesn't use light energy, it does depend on the light reactions to provide it with the ATP and NADPH.
5)By comparison, the second group of plants was given radioactively-labeled carbon dioxide and unlabeled water. Results showed that the oxygen released from the first group of plants was radioactive, confirming that water is the source of the oxygen produced by photosynthesis.
6)Write the balanced chemical equation for the process of photosynthesis. carbon dioxide + water — > glucose + oxygen + water. 6CO2 + 6H2O — > C6H12O6 + 6O2. Generally, photosynthesis utilizes light vitality to change over carbon dioxide into a starch.
7)H2O... coz it is required during photosynthesis as well as is an end product too...
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