Biology · Textbook solutions
Photosynthesis
Every solved example, exercise, and miscellaneous question, in the order the textbook teaches them. · 29 questions
Exercise
29 q
Q1. Choose correct option
Practice · 10
- Choose correct optionEx Q1(A)A cell that lacks chloroplast does not
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- Ex Q1(B)Energy is transferred from the light reaction step to the dark reaction step by
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- Ex Q1(C)Which one is wrong in photorespiration
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- Ex Q1(D)Non-cyclic photophorylation differs from cyclic photophosphorylation in that former
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- Ex Q1(E)For fixation of 6 molecules of and formation of one molecule of glucose in Calvin cycle, requires
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- Ex Q1(G)The head and tail of chlorophyll molecule are made up of
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- Ex Q1(H)The net result of photo-oxidation of water is release of .................
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- Ex Q1(I)For fixing one molecule of in Calvin cycle .............. are required
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- Ex Q1(J)In presence of high concentration of oxygen, RuBP carboxylase converts RuBP to ................
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- Ex Q1(K)The sequential order in electron transport from PSII to PSI of photosynthesis is
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Q2. Answer the following questions
Practice · 17
- Answer the following questionsEx Q2(A)Describe the light-dependent steps of photosynthesis. How are they linked to the dark reactions?
- Ex Q2(B)Distinguish between: a. respiration and photorespiration b. absorption spectrum and action spectrum c. cyclic photophosphorylation and non-cyclic photophosphorylation
- Ex Q2(C)What are the steps that are common to and photosynthesis?
- Ex Q2(D)Are the enzymes that catalyse the dark reactions of carbon fixation located inside the thylakoids or outside the thylakoids?
- Ex Q2(E)Calvin cycle consists of three phases, what are they? Explain the significance of each of them.
- Ex Q2(F)Why are the plants that consume more than the usual 18 ATP to produce 1 molecule of glucose favoured in tropical regions?
- Ex Q2(G)What is the advantage of having more than one pigment molecule in a photocentre?
- Ex Q2(H)Why does chlorophyll appear green in reflected light and red transmitted light? Explain the significance of these phenomena in terms of photosynthesis.
- Ex Q2(I)Explain why photosynthesis is considered the most important process in the biosphere.
- Ex Q2(J)Why is photolysis of water accompained with non-cyclic photophosphorylation?
- Ex Q2(K)In C-4 plants, why is C-3 pathway operated in bundle sheath cells only?
- Ex Q2(L)What would have happened if C-4 plants did not have Kranz anatomy?
- Ex Q2(M)Why does RUBISCO carry out preferentially carboxylation than oxygenation in plants?
- Ex Q2(N)What would have happened if plants did not have accessoy pigments?
- Ex Q2(O)How can you identify whether the plant is or ? Explain / Justify.
- Ex Q2(P)In plants, bundle sheath cells carrying out Calvin cycle are very few in number, even then, plants are highly productive. Explain.
- Ex Q2(Q)What is functional significance of Kranz anatomy?
Q3. Correct the pathway and name it
Practice · 1
- Ex Q3Correct the pathway and name it [Figure: two adjoining boxes, 'Mesophyll cell' on the left and 'Bundle Sheath Cell' on the right. An arrow brings in from the top, into the bundle sheath cell, to 'OAA', which sits at the boundary on the bundle sheath side. In the mesophyll cell an arrow curves from 'PEP' to 'OAA'; an arrow runs from 'OAA' back to 'Malic Acid' in the mesophyll cell; from 'Malic Acid' one arrow returns to 'PEP' and another crosses into the bundle sheath cell to ''. Inside the bundle sheath cell is a circular cycle labelled ' pathway'.]
Q4. Is there something wrong in following schematic...
Practice · 1
- Ex Q4Is there something wrong in following schematic presentation? If yes, correct it so that photosynthesis will be operated [Figure: a scheme of the light reaction. Light from the sun (a wavy arrow) falls on 'PS-I' on the left. Above PS-I is a 'Primary acceptor' with an arrow pointing down to PS-I and another arrow to 'Cytochrome complex'. Between PS-I and the cytochrome complex an arc turns 'ADP' into 'ATP'. An arrow runs from the cytochrome complex to 'PS-II'. From PS-II an arrow points up to a second 'Primary acceptor', which has an arrow to 'NADP reductase'; below it an arc turns '' into 'NADPH'. Along the bottom, '' has an arrow to ''; a curved arrow goes from the up to , and a line from the runs back along the bottom and up into PS-I.]