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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
Tropical plants like maize show high efficiency of `CO_2` fixation because ofA. TCA cycleB. EMP pathwayC. Hatch-Slack cycleD. Calvin cycle |
| Answer» Correct Answer - C | |
| 252. |
Positive effect of photorespirationA. reduces `O_(2)` injury to chloroplast in `C_(3)` plantB. balance the `O_(2)//CO-(2)` ratio of plantC. increase the yield of plantD. do not have any positive effect |
| Answer» Correct Answer - A | |
| 253. |
Product of photorespiration isA. PhosphoglyceratcB. Erythrose 4-phosphateC. Dilhydroxy acetone 3-phosphateD. All of the above |
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Answer» Correct Answer - A Product of photorespiration is phosphoglycerate. |
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| 254. |
Chlorophyll appears green due toA. Absorption of green lightB. Red fluorescenceC. Green fluoresecenseD. Absorption of red blue light |
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Answer» Correct Answer - D Chlorophyll appears green due to absorption of red and blue light while reflection of green light. |
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| 255. |
Photosynthesis in `C_(4)` plants is relatively less limited by atmospheric `CO_(2)` levels becauseA. Four carbon acids are the primary initial `CO_(2)` fixation productsB. The primary fixation of `CO_(2)` is mediated via PEP carboxylaseC. Effective pumping of `CO_(2)` into bundlesheath cellsD. Rubisco in `C_(4)` plants has higher affinity for `CO_(2)` |
| Answer» Correct Answer - B | |
| 256. |
Chloroplast contains maximum quanitity ofA. Pyruvic carboxylaseB. HexokinaseC. RuBP carboxylasesD. None of these |
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Answer» Correct Answer - C RuBP-oxygenase is a form of Rubisco, which constitutes 16% of chloroplast protein. It is the most abundant protein on this planet. |
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| 257. |
The carbon dioxide acceptor in Calvin cycle/`C_(3)`plants isA. Phosphoenol pyruvate (PEP)B. Ribulose 1,5-diphosphate (RuBP)C. Phosphoglyceric acid (PGA)D. Ribulose monophosphate (RMP) |
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Answer» Correct Answer - B The carbon dioxide acceptor in Calvin cycle/`C_(3)` plants is Ribulose 1,5-diphosphate (RuBP). |
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| 258. |
Which one of the following statements aboun the events of non-cyclic photophosphorylation is not correctA. Photolysis of water takes placeB. Only one photosystem participatesC. ATP and NADPH are producedD. `O_(2)` is released |
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Answer» Correct Answer - B Both photosystems participates in noncyclic photophosphorylation. |
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| 259. |
Which one of the following statements about the events of non-cyclic photophosphorylation is correct.A. Photolysis of water takes placeB. Oxygen is releasedC. Only one photosystem participatesD. ATP and NADPH are produced |
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Answer» Correct Answer - C In non -cyclic phosphorylation , electrons derived from the photolysis of water are raised to higher energy levles in PS-I , PS-II and pass along an electron transport chain of carrier molecule of NADP reduce . This enzyme transfers electrons to `NADPH^(+)` to make NADPH, which provides reducing power for light dependent reactions of photosynthesis. Both PS-I and PS-II participates. |
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| 260. |
Where does the primary photochemical reaction occur in the chloroplast ?A. Quantasome or thylakoidB. StromaC. GranaD. Inner - membrane of chloroplast |
| Answer» Correct Answer - A | |
| 261. |
The source of hydrogen atoms for the synthesis of glucose isA. `H_2O`B. `FADH_2`C. `NADPH_2`D. ATP |
| Answer» Correct Answer - C | |
| 262. |
For synthesis of a molecule of glucose, the requirement of `ATP` and `NADPH` is respectivelyA. 15 and 10B. 33 and 22C. 12 and 8D. 30 and 12 |
| Answer» Correct Answer - D | |
| 263. |
Photochemical phase does not includeA. light absorpitonB. water splitting and `O_(2)` releaseC. ATP and NADPH formationD. `CO_(2)` fixation. |
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Answer» Correct Answer - D The complete process of photosynthesis is studied under two phases-photochemical phae and biosynthetic phase. Photochemical phas involves absorpiton of light energy, photolysis of water with the release of `O_(2)` and production of assimiliatory power (i.e., ATP_NADPH). `CO_(2)` fixation occurs during biosynthetic phase photosynthesis. |
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| 264. |
Cyclic photosphorylation links toA. PS-IIB. PS-IC. Both (a) and (b)D. dark -reaction |
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Answer» Correct Answer - B Cyclic photophosphorylation , involves only PS-I and in this electrons explled by excited photocentre are retured to it after passing over a chain of electron carriers. Two molecules of ATP are synthesised in this process. |
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| 265. |
Photosynthesis isA. Oxidative ,exergonic, catabolicB. Reductive,endergonic,anabolicC. Reductive,exergonic,anabolicD. Reductive,endergonic,catabolic |
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Answer» Correct Answer - B Reduction of carbon, anabolised organic compound will give ATP during respiration. Photosynthesis is an anabolic and endothermic reaction. It is a mechanism of synthesis of food. |
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| 266. |
The electron transport chain of photosynthetic process isA. In the stroma of the chloroplastB. Bound to the thylakoid membranesC. Present in the outer membrane of the chloroplastD. Present in mitochondria |
| Answer» Correct Answer - B | |
| 267. |
Which one of the following is a CAM plantA. MaizeB. KalanchoseC. SugarcaneD. Jower |
| Answer» Correct Answer - B | |
| 268. |
`C_(4)` plants are adapted toA. Hot and dry climateB. Temperature climateC. Cold and dry climateD. Hot and humid climate |
| Answer» Correct Answer - B | |
| 269. |
A plant in your garden avoids photorespiratory losses, has improved water use efficiency shows high rates of photosynthesis at high temperatures and has improved efficiency of nitrogen utilisation. In which of the followubg physiological groups would you assign this plantA. `C_(4)`B. `CAM`C. Nitrogen fixerD. `C_(3)` |
| Answer» Correct Answer - A | |
| 270. |
A plant in your garden avoids photorespiratory losses, has improved water use efficiency shows high rates of photosynthesis at high temperatures and has improved efficiency of nitrogen utilisation. In which of the followubg physiological groups would you assign this plantA. `C_(3)`B. `C_(4)`C. CAMD. Nitrogen fixer |
| Answer» Correct Answer - D | |
| 271. |
In photosynthesis , energy from light reaction to dark reaction is transferred in the form ofA. ADPB. ATPC. ChlorophyllD. RuBP |
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Answer» Correct Answer - B Energy from light reaction is transferred to dark reaction in the form of ATP. |
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| 272. |
The wavelength of light most absorbed during photosynthesis isA. 440 mB. 550 mC. 660 mD. 700 m |
| Answer» Correct Answer - A | |
| 273. |
In photosynthesis, energy for passage of electron is the one that is absorbed byA. ChlorophyllB. RuBPC. WaterD. ATP |
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Answer» Correct Answer - A In photosynthesis, energy for passage of electron is the one that is absorbed by chlorophyll. |
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| 274. |
Which of the following acts as electron carrier in both photosynthesis and respirtion ?A. FerredoxinB. PhytochromeC. CytochromeD. Cryptochrome |
| Answer» Correct Answer - C | |
| 275. |
The source of oxygen evolved during photosynthesis isA. `H_(2)S`B. `H_(2)O`C. `CO_(2)`D. `HCO_(3)` |
| Answer» Correct Answer - B | |
| 276. |
During photosynthesisA. Both `CO_(2)` and water get oxidizedB. Both `CO_(2)` and water get reducedC. Carbon dioxide get reduced, water get oxidised and ATP is fromedD. |
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Answer» Correct Answer - D Photosynthesis is an oxidation reduction process where `H_(2)O` is oxidized by photolysis into `O_(2)` and `CO_(2)` is reduced into carbohydrates. |
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| 277. |
Carbon assimilation occurs in bundle sheath cells ofA. CAM plantsB. `C_(4)` plantsC. `C_(3)` plantsD. All of the above |
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Answer» Correct Answer - B Carbon assimilation (Calvin cycle) occurs in bundle sheath cells of `C_(4)` plants. |
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| 278. |
Which of the following is least effective in photosynthesisA. Sum lightB. Red lightC. Blue lightD. Green light |
| Answer» Correct Answer - D | |
| 279. |
The most unique feature of photosynthesis isA. production of oxygenB. production of foodC. conversion of light energy into chemical energyD. All of the above |
| Answer» Correct Answer - D | |
| 280. |
The source of energy for carbon assimilation isA. waterB. sunlightC. carbon dioxideD. chlorophyll |
| Answer» Correct Answer - B | |
| 281. |
Which light range is most effective inA. BlueB. GreenC. RedD. Violet |
| Answer» Correct Answer - C | |
| 282. |
In a chloroplast the highest number of protons are found inA. StromaB. Lumen ofthylakoidsC. Inter-membrane spaceD. Antennae complex |
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Answer» Correct Answer - B In a chloroplast the highest number of protons are found in lumen of thylakoids. |
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| 283. |
Chemiosmotic mechanism of ATP synthesis was proposed byA. Fredrick LoschB. Felix DujardinC. Peter MitchellD. Carl Landsteiner |
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Answer» Correct Answer - C Chemiosmotic hypothesis to understand actual mechanism of ATP synthesis in mitochondria was proposed by Peter Mitchell. |
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| 284. |
In photosynthesis, the light-independent reactions take place atA. Photosystem IB. Photosystem IIC. Stromal matrixD. Thylakoid lumen |
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Answer» Correct Answer - C In photosynthesis, the light-independent reaction take place at stroll matrix. |
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| 285. |
Rate of photosynthesis is maximum inA. Orange lightB. Yellow lightC. Blue lightD. Green light |
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Answer» Correct Answer - C Rate of photosynthesis is maximum in blue light. |
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| 286. |
Formation of phosphoglyde phosopholyceric acid isA. HydrolysisB. oxidationC. ReductionD. Electrolysis |
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Answer» Correct Answer - C Formation of phosphoglyceraldehyde from phosphoglyceric acid is reduction. |
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| 287. |
With reference to photosynthesis, what is the `CF_(0) - CF_(1)` complex?A. ATP synthetaseB. Ferrodoxin - NADP reductaseC. Cytochrome `(b_(6))//("fCOMPLEX")`D. RuBP carboxylase |
| Answer» Correct Answer - A | |
| 288. |
Which of the following show dimorphism ?A. All `C_4`-plantsB. All plantsC. Only algaeD. Chloroplast of `C_4` -plant |
| Answer» Correct Answer - D | |
| 289. |
Which plant shows chloroplast dimorphism?A. SugarcaneB. `C_(4)` plantsC. Sugar BeetD. Both A and B |
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Answer» Correct Answer - D `"Sugarcane/`"(C_(4)` plant) shows chloroplast dimorphism. |
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| 290. |
Which is correct about chlorophyll a and b in leaves of higher plants?A. Both are present in equal proportionB. Chlorophyll a is more than chlorophyll bC. Chlorophyll a is less than chlorophyll bD. Chlorophyll b is ten times more than chlorophyll a |
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Answer» Correct Answer - B Chlorophyll a is more than chlorophyll b. |
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| 291. |
Cytochromes areA. `O_(2)`acceptorsB. `H_(2)` acceptorsC. Electron acceptorsD. `H_(2)O` acceptors |
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Answer» Correct Answer - C Cytochromes are electron acceptors. |
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| 292. |
Name the scientists who first worked out the `C_(4)` -pathway ?A. Melvin CalvinB. Robin HillC. LinnaeusD. Hatch and Slack |
| Answer» Correct Answer - D | |
| 293. |
Which of the following correctly explains the reason why `C_(4)` - pathway is name so ?A. it requires four turns of Calvin cycle to produce one `C_(6)H_12O_6`B. First stable compound is 4CC. Primary `CO_2` acceptor is 4CD. it requires four raw materials |
| Answer» Correct Answer - B | |
| 294. |
Which light range is lest effective in phosynthesis?A. blue and greenB. GreenC. red and greenD. Violet |
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Answer» Correct Answer - B Blue and red regions of the light spectrun are most effective in photosynthesis. Blue wavelengths of light carry more energy while red wvelengths have lesser energy. Therefore, the most efficient wavelengths of light effective in phosynthesis are those of red light. Green light is least effective in photosynthesis. |
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| 295. |
When temperature is increased from minimum to optimum, rate of phosynthesis doubles for every ____ rise in temperature.A. `1^(@)C`B. `10^(@)C`C. `20^(@)C`D. `30^(@)C` |
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Answer» Correct Answer - B Rate of photosynthesis usually increaes with an increase in temperature upto `40^(@)C` Above this temperature. Rate of photosynthesis starts decreasing due to inactivation of enzyme. The minimum temoperature at which most plants start photosynthesis is `0^(@)-5^(@)C` but it can be as low as `-20^(@)C` for lichens and `-35^(@)C` for some gymnosperms. The maximum temperature at which photosyntheis can occur is `55^(@)C` in some desert plants and `75^(@)C` for hot spring algae. When temperature is increaed from minimum to optimum, the rate of photosynthesis fdoubles for every `10^(@)C` rise in temperature. |
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| 296. |
Which of the following conditions are favourable for cyclic photophosphorylationA. Anaerobic conditionB. Aerobic and optimum lightC. Aerobic and low light intensityD. Anaerobic and low light intensity |
| Answer» Correct Answer - D | |
| 297. |
Asserton : One molecule of `CO_(2)` is fixed to give 686 kcal in photosynthesis. Reason : To from a hoxose, six molecules of `CO_(2)` are fixed.A. If both the asserition and the reasion are true and the reason is a correct explanation of the assertionB. If both the assertion and reasoni s not a correct ecplanation of the assertioC. If the assertion is true but the reason is falseD. If the assertion is false but reason is true |
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Answer» Correct Answer - E The overall equation of photosynthesis is `CO_(2) + 2H_(2)O + n(hv) to (CH_(2)O) + H_(2)O + O_(2)`. The standard free-energy change for the synthesis of hexose from `CO_(2)` and `H_(2)O` is `Delta G^(@)` = +686 kcal. As six molecules of `CO_(2)` is involved to form one molecule of hexose, the energy input per `CO_(2)` molecule will be 114 kcal. |
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| 298. |
ATP molecules required to synthesize one molecule of glucose by `C_(4)`, pathway areA. 12B. 18C. 24D. 30 |
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Answer» Correct Answer - D ATP molecules required to synthesize one molecule of glucose by `C_(4)` pathway are 30. |
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| 299. |
The process in which organisms do not require light and pigment and synthesize their, food utilizing energy released by the oxidation of inorganic and organic substance , isA. PhotoautotrophismB. HeterotrophismC. ChemosynthesisD. Saprophytism |
| Answer» Correct Answer - C | |
| 300. |
ATP synthase of chloroplasts is similar to that ofA. MitochondriaB. PeroxisomesC. Golgi bodiesD. Microsomes |
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Answer» Correct Answer - A ATP synthase of chloroplasts is similar to that of mitochondria. |
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