Review questions 1) Describe some differences and similarities between photosyst

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Question

Review questions 1) Describe some differences and similarities between photosystem I and photosystem II 2) Describe the factors that affect the rate of photosynthesis im where light-dependent reactions and light-independent reactions take place. What are the products of the light-dependent reactions and light-independent reactions al Explai 3) Write the equation for photosynthesis in word and formula form. 4) Draw and label a typical chloroplast. Describe the function of each part of the chloroplast.

Explanation / Answer

Q.1 Answer

Similarities between Photosystem 1 and photosystem 2.

1. Both systems works for conversion of light energy into chemical energy.

2. In both systems a special chlorophyll molecule, other chlorophyll molecules and carotene molecules are present.

3. Both systems have active reaction center where actual photoexcitation takes place.

Differences between photosystem 1 and 2.

Photosystem 1

Photosystem 2

It is located in thylakoid membranes

It is located in stroma thylakoids.

It is made up of 3 forms of chlorophyll-a.

It is made up of 2 forms of chlorophyll-a.

3 forms of chl-a shows maximum absorbance at 683nm, 695nm,670nm.

2 forms of Chl-a shows maximum absorbance at 670nm, 690nm.

Also called as P700.

Also called as P690.

It takes part in both cyclic and non cyclic photophosphorylation.

It takes part only in non cyclic photophosphorylation.

It can work independently

It can work only in conjunction with PS-1

It is driven by far- red light.

It is driven by red light.

Q.2 Factors affecting photosynthesis-

Factors affecting photosynthesis includes carbon dioxide, light intensity, quality of light, Duration of light, Temperature, oxygen, water.

Q.2 a Answer- light dependent reaction includes cyclic and non cyclic photophosphorylation. It takes place in thylakoid membrane inside chloroplast. Its products are ATP and NADPH. These reaction are also called as Hill reaction.

Light independent reactions also called as Dark reactions/ blackmann reaction. It includes Calvin cycle. ATP and NADPH are consumed to produce glucose molecule.This process occurs in stroma of Chloroplast.