Question
Mention the major events during photosynthesis.
✓
Answer
1. Photolysis: With the help of light energy, oxygen evolving Z-complex splits up water into its components- protons ( $H ^{+}$), electrons ( $e ^{-}$) and oxygen.
$2 H_2 O \xrightarrow[Mn, Ca, Cl]{OEC} O_2+4 H^{+}+4 e^{-}$
2. Absorption of Light Energy: Chlorophyll absorbs light energy.
3. Primary Reaction: Chlorophyll converts the absorbed light energy into chemical energy. It is called primary reaction of photosynthesis. It builds up ATP with the help of excited electrons.
4. Formation of Reducing Power: Coenzyme NADP ${ }^{+}$is changed to reduced form of NADPH.
$NADP^{+}+H^{+}+2 e^{-} \rightarrow NADPH$
5. Reduction of $CO _2$ : Carbon dioxide is reduced enzymatically with the help of NADPH and ATP to form carbohydrates.
$6 CO_2+12 NADPH+18 ATP \rightarrow C_6 H_{12} O_6+12 NADP^{+}+18 ADP+18 Pi$
$2 H_2 O \xrightarrow[Mn, Ca, Cl]{OEC} O_2+4 H^{+}+4 e^{-}$
2. Absorption of Light Energy: Chlorophyll absorbs light energy.
3. Primary Reaction: Chlorophyll converts the absorbed light energy into chemical energy. It is called primary reaction of photosynthesis. It builds up ATP with the help of excited electrons.
4. Formation of Reducing Power: Coenzyme NADP ${ }^{+}$is changed to reduced form of NADPH.
$NADP^{+}+H^{+}+2 e^{-} \rightarrow NADPH$
5. Reduction of $CO _2$ : Carbon dioxide is reduced enzymatically with the help of NADPH and ATP to form carbohydrates.
$6 CO_2+12 NADPH+18 ATP \rightarrow C_6 H_{12} O_6+12 NADP^{+}+18 ADP+18 Pi$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Two very small organisms X and Y both reproduce by the method of budding. Organism X is industrially very important because it is used in making alcohol from sugar. It is also used in making bread. Organism Y Lives in freshwater. If organism Y gets cut into a number of parts accidently, each cut part can grow to form complete organism.
- What are organisms X and Y?
- What is the name of the process in which X converts sugar into alcohol?
- To which class of organisms does X belong?
- Name an important body feature of organism Y.
- Which organism is multicellular and which one is unicellular?
- State the laws of refraction of light. Give an expression to relate the absolute refractive index of a medium with speed of light in vacuum.
- The refractive indices of water and glass with respect to air are 4/3 and 3/2 respectively. If the speed of light in glass is $2\times 10^8 \text{ ms}^{-1},$ find the speed of light in (i) air, (ii) water.
- Write the name of the human male reproductive organ that produces sperms and secretes a hormone. Name the hormone secreted and state its function?
- Write the site of fertilization and the part where the zygote gets implanted in the human female.
- State, in brief, how an embryo gets its nourishment inside the mother's body.
What are fossils? How are fossils formed and how is their age determined? State the importance of fossils in the study of evolution.
What does a soda-acid type fire extinguisher contain? How does it work?
Explain the working of a soda- acid fire extinguisher with the help of a labelled diagram.
Explain the working of a soda- acid fire extinguisher with the help of a labelled diagram.
The organs P and Q of two animals have different structures but similar functions. On the other hand, the two organs R and S of two other animals have the same basic structure but different functions.
- What are the organs like P and Q known as?
- Name the organs like P and Q. Also name the animals which have such organs.
- What are the organs like R and S called?
- Name the organs like R and S. Also name the animals which have such organs.
What are the methods used by plants to get rid of their waste products?
Differentiate between an autotroph and a heterotroph.
Calculate the combined resistance in each case:
A small part of the shoot of a plant is removed with a sharp knife. When the lower end of this small part of the shoot is buried in moist soil, it gradually develops roots and shoots and grows to become a new plant.
- What is the name of this method of propagating plants?
- What care should be taken while removing a small part of the shoot from the parent plant with a knife?
- Name any two plants which provide us with food directly or indirectly and are grown by this method.
- Give one advantage of this method of producing new plants.
- State whether it is a sexual method of reproduction or an asexual method. Why?
- What special name can be given to the genetically identical new plants produced by this technique?