MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which one of the following statements about cytochrome\[{{P}_{450}}\]is wrong [CBSE PMT 1998] |
| A. | It has an important role in metabolism |
| B. | It contains iron |
| C. | It is a coloured cell |
| D. | It is an enzyme involved in oxidation reactions |
| Answer» D. It is an enzyme involved in oxidation reactions | |
| 2. |
In photosynthesis light energy is utilized in [CPMT 1998; MHCET 2003] |
| A. | Converting ATP into ADP |
| B. | Changing\[C{{O}_{2}}\]into carbohydrate |
| C. | Converting ADP into ATP |
| D. | All of the above |
| Answer» D. All of the above | |
| 3. |
Main pigment involved in transfer of electrons in photosynthesis is [CPMT 1998] |
| A. | Cytochrome |
| B. | Phytochrome |
| C. | Both [a] and [b] |
| D. | None of these |
| Answer» B. Phytochrome | |
| 4. |
Which pigment is present universally in all green plants [MP PMT 1999] |
| A. | Chlorophyll-a |
| B. | Chlorophyll-b |
| C. | Chlorophyll-c |
| D. | Chlorophyll-m |
| Answer» B. Chlorophyll-b | |
| 5. |
Which one of the following elements is required for photosynthetic oxygen evolution [MP PMT 1998] |
| A. | Copper |
| B. | Iron |
| C. | Manganese |
| D. | Zinc |
| Answer» D. Zinc | |
| 6. |
The wavelength of light most absorbed during photosynthesis is [MP PMT 1998] |
| A. | 440 nm |
| B. | 550 nm |
| C. | 660 nm |
| D. | 700 nm |
| Answer» B. 550 nm | |
| 7. |
Splitting of water in photosynthesis is called [RPMT 1985; MHCET 2001; Pb. PMT 2000,2004] |
| A. | Dark reaction |
| B. | Electron transfer |
| C. | Photolysis |
| D. | Phototropism |
| Answer» D. Phototropism | |
| 8. |
The ?Z? scheme of photosynthesis was proposed by |
| A. | Hill and Bendall |
| B. | Emerson |
| C. | Arnon |
| D. | Rabinowitch and Govindjee |
| Answer» B. Emerson | |
| 9. |
Ferredoxin is a component of [CBSE PMT 1991] |
| A. | Hill reaction |
| B. | Photosystem-I |
| C. | P-680 |
| D. | Photosystem-II |
| Answer» C. P-680 | |
| 10. |
Hill's law in photosynthesis shows [CPMT 1996] |
| A. | Electron exitation |
| B. | Removal of water |
| C. | Fixation of\[C{{O}_{2}}\] |
| D. | \[{{O}_{2}}\]is obtained from water |
| Answer» E. | |
| 11. |
In which stage of photosynthesis, light is directly necessary [CPMT 1996] |
| A. | For electron exitation |
| B. | For reduction of\[C{{O}_{2}}\] |
| C. | For regulating photosystem |
| D. | For cyclic photophosphorylation |
| Answer» B. For reduction of\[C{{O}_{2}}\] | |
| 12. |
Photolysis of water takes place in [CPMT 1995] |
| A. | Calvin cycle |
| B. | Glycolysis |
| C. | Light phase |
| D. | Dark phase |
| Answer» D. Dark phase | |
| 13. |
In photosynthesis the energy formed is transferred in the form of [Bihar MDAT 1995] |
| A. | ADP |
| B. | AMP + ADP |
| C. | \[NADP{{H}^{2}}+ATP\] |
| D. | ATP |
| Answer» E. | |
| 14. |
Which one is\[C{{u}^{++}}\]containing pigment [CPMT 1999, 2003; MP PMT 2003] |
| A. | Ferredoxin |
| B. | Plastocyanin |
| C. | Plastoquinone |
| D. | Cytochrome |
| Answer» C. Plastoquinone | |
| 15. |
The chlorophylls absorb visible light in the region of following wavelengths [BHU 1994] |
| A. | 400 nm to 500 nm only |
| B. | 600 nm to 800 nm only |
| C. | 400 nm to 500 nm and 600 nm to 700 nm |
| D. | 300 nm to 400 nm only |
| Answer» D. 300 nm to 400 nm only | |
| 16. |
Who revealed the chemical composition of chlorophyll carotene and xanthophyll |
| A. | Govindjee |
| B. | Willstatter and Stoll |
| C. | Park and Biggins |
| D. | Meyers and French |
| Answer» C. Park and Biggins | |
| 17. |
What is a quantasome |
| A. | Particle of photosynthetic pigments |
| B. | A macro-molecule |
| C. | An enzyme |
| D. | A cofactor of\[C{{O}_{2}}\]assimilation |
| Answer» B. A macro-molecule | |
| 18. |
How chlorophyll would appear when seen in red light |
| A. | Red |
| B. | Green |
| C. | Black |
| D. | Colourless |
| Answer» D. Colourless | |
| 19. |
What are the two peaks of light absorption of Chlorophyll 'a'. The two peaks are near |
| A. | 400 and 500 nm |
| B. | 430 and 730 nm |
| C. | 430 and 660 nm |
| D. | 400 and 660 nm |
| Answer» D. 400 and 660 nm | |
| 20. |
Photosynthetic pigments in chloroplast are embedded in membrane of [CBSE PMT 1991] |
| A. | Thylakoids |
| B. | Photoglobin |
| C. | Matrix |
| D. | Envelope of chloroplast |
| Answer» B. Photoglobin | |
| 21. |
Chlorophyll 'a' and 'b' shows maximum absorption in |
| A. | Blue region |
| B. | Red region |
| C. | Blue and red regions |
| D. | Yellow and violet regions |
| Answer» D. Yellow and violet regions | |
| 22. |
Why the rate of photosynthesis declines at very strong light intensities. It may be due to |
| A. | Increased respiration |
| B. | Decreased hydration |
| C. | Photo-oxidation of chlorophyll |
| D. | All the above |
| Answer» D. All the above | |
| 23. |
In higher plants, the photosynthetic pigments are |
| A. | Chl a + Chl b + anthocyanins |
| B. | Chl a + carotenoid |
| C. | Chl a + Chl b + carotenoid |
| D. | Chl b + carotenoid + phycobilins |
| Answer» D. Chl b + carotenoid + phycobilins | |
| 24. |
How much energy in terms of ATP equivalents is consumed in the photosynthetic production of a mole of hexose |
| A. | 36 ATP eq. |
| B. | 38 ATP eq. |
| C. | 40 ATP eq. |
| D. | 54 ATP eq. |
| Answer» E. | |
| 25. |
The first electron carrier molecule from\[{{P}_{700}}\]to\[NAD{{P}^{+}}\]is believed to be |
| A. | Cytochrome |
| B. | Cu protein/plastocyanin |
| C. | FeS protein/ferredoxin |
| D. | FeMg protein |
| Answer» D. FeMg protein | |
| 26. |
Which of the following does not participate when the light reaction synthesizes only ATP or performs the cyclic flow of electrons [AIIMS 1981] |
| A. | PS-I |
| B. | PS-II |
| C. | Ferredoxin |
| D. | Plastocyanin |
| Answer» C. Ferredoxin | |
| 27. |
The energy of a ?mole? of light quanta is 72 kcal in blue region at 400 nm and 41 kcal in red region at 700 nm. How much light energy would be required under standard conditions to make 1 mole of glucose costing 686 kcal |
| A. | 1986 kcal |
| B. | 1968 to 3456 kcal |
| C. | 2620 to 3456 kcal |
| D. | 1980 kcal |
| Answer» C. 2620 to 3456 kcal | |
| 28. |
Which photochemical reaction generates strong oxidant and weak reductant |
| A. | LR-I |
| B. | LR-II |
| C. | Cyclic photophosphorylation |
| D. | Non-cyclic photophosphorylation |
| Answer» C. Cyclic photophosphorylation | |
| 29. |
In light reaction of photosynthesis, chlorophyll is subjected to |
| A. | Destruction |
| B. | Permanent reduction |
| C. | Oxidation and reduction |
| D. | Neutralization |
| Answer» D. Neutralization | |
| 30. |
Continued evolution of\[{{O}_{2}}\]in suspension of an isolated chloroplast in light in the presence of ferric salt, viologen dyes etc. is called |
| A. | Emmerson's reaction |
| B. | Hill's reaction |
| C. | Blackman's reaction |
| D. | Oxygenation |
| Answer» C. Blackman's reaction | |
| 31. |
An isolated chloroplast upon illumination converts ferric into ferrous and produces \[{{O}_{2}}\]. What happens if it is washed in running water prior to illumination |
| A. | Only \[{{O}_{2}}\] is produced |
| B. | Only ferric is converted into ferrous |
| C. | Both the above happens |
| D. | Neither\[{{O}_{2}}\]is produced nor ferric is reduced |
| Answer» C. Both the above happens | |
| 32. |
Absorption of light by chlorophyll of PS - II causes |
| A. | Reduction of\[C{{O}_{2}}\] |
| B. | Photolysis of H2O |
| C. | Flowering |
| D. | Glucose formation |
| Answer» C. Flowering | |
| 33. |
Fluorescent chlorophyll 'a' occurs in |
| A. | PS-I |
| B. | PS-II |
| C. | [a] and [b] both |
| D. | Stroma |
| Answer» C. [a] and [b] both | |
| 34. |
True for each quantasome is that |
| A. | Chl b > Chl > carotene > quinones |
| B. | Carotene > Chl b > Chl a > quinones |
| C. | Chl a > Chl b > carotenoid > quinones |
| D. | Quinones > Chl a > carotenoid > Chl b |
| Answer» D. Quinones > Chl a > carotenoid > Chl b | |
| 35. |
The separation of water into hydrogen and oxygen during photosynthesis is aided by |
| A. | Nitrogen and phosphorus compounds |
| B. | Mn and chloride ions |
| C. | Fe and high turgor pressure |
| D. | Cu and Mo atoms |
| Answer» C. Fe and high turgor pressure | |
| 36. |
Photosystem-I contains [BHU 1983; RPMT 1987, 92] |
| A. | Chl a, Chl b, carotenoid and\[{{P}_{680}}\] |
| B. | Chl a, Chl b and\[{{P}_{690}}\] |
| C. | Chl a, Chl b and\[{{P}_{700}}\] |
| D. | Chl a, xanthophyll and\[{{P}_{700}}\] |
| Answer» D. Chl a, xanthophyll and\[{{P}_{700}}\] | |
| 37. |
Results of light reaction is/are [MDAT Bihar 1995; KCET 1994] |
| A. | Only ATP |
| B. | Only\[NADP{{H}_{2}}\] |
| C. | ATP and\[NADP{{H}_{2}}\] |
| D. | Only FAD |
| E. | None of these |
| Answer» D. Only FAD | |
| 38. |
Chloroplasts absorb light of wavelength [CPMT 1994] |
| A. | \[200-300m\mu \] |
| B. | \[800-1000m\mu \] |
| C. | \[460-660m\mu \] |
| D. | \[300-400m\mu \] |
| Answer» D. \[300-400m\mu \] | |
| 39. |
The reaction centre for PS-I and PS- II are [MP PMT 2003] |
| A. | \[{{P}_{700}}\]and\[{{P}_{680}}\]respectively |
| B. | \[{{P}_{680}}\]and\[{{P}_{700}}\]respectively |
| C. | \[{{P}_{580}}\]and\[{{P}_{700}}\]respectively |
| D. | \[{{P}_{700}}\]and\[{{P}_{580}}\]respectively |
| Answer» B. \[{{P}_{680}}\]and\[{{P}_{700}}\]respectively | |
| 40. |
Unidirectional flow of electrons in photophosphorylation takes place in |
| A. | Cyclic |
| B. | Non-cyclic |
| C. | Pseudocyclic |
| D. | All the above |
| Answer» B. Non-cyclic | |
| 41. |
Which element is left when chlorophyll is burnt [CPMT 1993] |
| A. | Iron |
| B. | Manganese |
| C. | Magnesium |
| D. | Molybdenum |
| Answer» D. Molybdenum | |
| 42. |
The main difference between the molecules of chlorophyll a and b is |
| A. | Chlorophyll a has an aldehyde group while chlorophyll b has a methyl group |
| B. | Chlorophyll a has a methyl group while chlorophyll b has an aldehyde group |
| C. | The phytol tail is absent in chlorophyll a and is present in chlorophyll b |
| D. | The porphyrin group in chlorophyll b has no binding site but a binding site is present in chlorophyll a |
| Answer» C. The phytol tail is absent in chlorophyll a and is present in chlorophyll b | |
| 43. |
The life of all excited chlorophyll molecules is |
| A. | Less than 0.01 second |
| B. | More than 0.01 second |
| C. | 10 seconds |
| D. | 1 second |
| Answer» B. More than 0.01 second | |
| 44. |
Chlorophyll is [MP PMT 1996; BVP 2002] |
| A. | Soluble in organic solvents |
| B. | Soluble in water |
| C. | Soluble in both organic solvents and water |
| D. | None of the above |
| Answer» B. Soluble in water | |
| 45. |
Chlorophyll a molecule lost 1 electron from its outer orbit and gain |
| A. | Negative charge |
| B. | Becomes neutral |
| C. | Positive charge |
| D. | None of the above |
| Answer» D. None of the above | |
| 46. |
The approximate dimension of chlorophyll porphyrin ring is |
| A. | \[\text{1}\overset{\text{o}}{\mathop{\text{A}}}\,\]square |
| B. | \[\text{5}\overset{\text{o}}{\mathop{\text{A}}}\,\]square |
| C. | \[\text{10}\overset{\text{o}}{\mathop{\text{A}}}\,\]square |
| D. | \[\text{15}\overset{\text{o}}{\mathop{\text{A}}}\,\]square |
| Answer» E. | |
| 47. |
Anthocyanin generally occurs in the nature in the form of |
| A. | Chlorides |
| B. | Phosphates |
| C. | Both [a] and [b] |
| D. | None of the above |
| Answer» B. Phosphates | |
| 48. |
Hill's reaction takes place in [CPMT 1986] |
| A. | Dark |
| B. | Light |
| C. | Dark and light both |
| D. | At any time |
| Answer» C. Dark and light both | |
| 49. |
The core metal of chlorophyll is [CBSE PMT 1997,99; AFMC 1999; CPMT 2005] |
| A. | Fe |
| B. | Mg |
| C. | Ni |
| D. | Cu |
| Answer» C. Ni | |
| 50. |
Which type of phosphorylation takes place in photosynthesis |
| A. | Cyclic |
| B. | Non-cyclic |
| C. | Both [a] and [b] |
| D. | None of the above |
| Answer» D. None of the above | |