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InterviewSolution
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.
| 651. |
The first step in dark reaction of photosynthesis isA. Formation of ATPB. Ionizaition of waterC. Attachment of `CO_(2)` to a pentose sugarD. Excitement of electron of chlorophyll by a photon of light |
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Answer» Correct Answer - C Ribulose 1,5-diphosphate (also known as ribulose biphosphate) a phosphorylated 5 carbon sugar (pentose surgar) it is first attached with `CO_(2)` in photosynthesis. |
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| 652. |
Which of the following is present in Calvin Cycle.A. PhotophosphorylationB. Oxidative carboxylationC. Reductive carboxylationD. Oxidative phosphoroylation |
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Answer» Correct Answer - C Reductive carboxylation start with a 5 carbon sugar ribulose-5 phosphate. 6 mol of this sugar react with 6 mol of ATP (produced in light reaction) to form 6 mol of RuBP and 6 mol ADP. Ribulose -5 phosphate `overset("Phosphopentakinase")to` Ribulose 1,5-biphosphate+6ADP |
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| 653. |
During dark reaction of photosynthesisA. Water splitB. `CO_(2)` is reduced to organic comoundsC. Chlorophyll is activatedD. 6 carbon sugar is broken down into 3 carbon sugar |
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Answer» Correct Answer - B The new name of dark reaction is carbon assimilation, in which `CO_(2)` gas reacting with `H_(2)O` (liquid) synthesizes solid glucose. |
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| 654. |
3-PGA is first stable product inA. Carbon reduction cycleB. OAAC. Malic acidD. PEP |
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Answer» Correct Answer - A In `C_(3)` cycle, I presence of rubisco (RuBP carboxylase) `CO_(2)` combines with ribulose 1,5-bisphosphate (acceptor molecule) to form 3-phosphoglyceric acid or 3-PGA which is the first stable product of carbon reduction cycle. |
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| 655. |
Crabohydrates, the most abundant biomlecles on earth, are produced byA. All bacteria , fungi and algaeB. Fungi, algae, and green plant cellsC. Some bacteria , algae, and green plants cellsD. Viruses, fungi and bacteria |
| Answer» Correct Answer - C | |
| 656. |
As compared to a `C_(3)` plant, how many additional molecules of ATP are needed for net production of one molecule hexose sugar by `C_(4)` plantsA. TwoB. SixC. ZeroD. Twelve |
| Answer» Correct Answer - D | |
| 657. |
Photosynthesis in `C_(4)` plants is relatively less limited by atmospheric `CO_(2)` levels becauseA. effectve pumping of `CO_(2)` into bundle sheath cellsB. RuBisCO in `C_(4)`-plants has higher affinity for `CO_(2)`C. Four carbon acids are the primary initial `CO_(2)`-fixation productsD. The primary fixation of `CO_(2)` is mediated via PEP carboxylase |
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Answer» Correct Answer - D The fixation of `CO_(2)` in `C_(4)`-plants takes place in two places and by two different organic compounds. Phosphoenol pyruvate (PEP) is found atmospheric `CO_(2)` into oxalo acetic acid (4C). RuBisCO is present in bundle sheath cells where final fixation of `CO_(2)` in hexose sugars takes place. `CO_(2)` is primarily fixed by PEP carboxylase because this enzyme has greater affinity to `CO_(2)` than RuBisCO. |
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| 658. |
During photorespiration, the oxygen consuming reaction (s) occur inA. stroma of chloroplasts and peroxisomesB. grana of chloroplasts and peroxisomesC. stroma of chloroplastsD. stroma of chloroplasts and mitochondria |
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Answer» Correct Answer - A The first reaction of photorespiration occurs in stroma of chloroplast. In this reaction the RuBP molecule in presenec of enzyme RuBisCO. In peroxisome the glycolate transferred from chloroplast takes up `O_(2)` and formed the glyoxylate whereas, the `H_(2)O_(2)` released as byproduct. |
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| 659. |
Action spectrum of photosynthesis resembles roughly theA. Absorption spectrum of chlorophyll aB. Absorption spectrum of chlorophyll bC. Absorption spectrum of chlorophyll cD. Absorption spectrum of chlorophyll a and b |
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Answer» Correct Answer - A Action spectrum of photosynthesis resembles roughly the absorption spectra of chlorophyll. |
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| 660. |
Calvin cycle involvesA. Oxidative carboxylationB. Reductive carboxylationC. Oxidative decarboxylationD. Reductive decarboxylation |
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Answer» Correct Answer - B Calvin cycle involves reductive carboxylation. |
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| 661. |
An oxidative phosphorylation is the formation ofA. `NADPH_(2)` in respirationB. `NADPH_(2)` in photosynthesisC. ATP in respirationD. ATP in photosynthesis |
| Answer» Correct Answer - C | |
| 662. |
Leaf pigments of any green plants can be separated byA. X-ray diffractionB. SedimentationC. Paper chromatographyD. Centrifugation |
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Answer» Correct Answer - C Leaf pigments of any green plants can be separated by paper chromatography. |
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| 663. |
During monsoon, the rice crop of eastern states of India shows lesser yield due to limiting factor ofA. `CO_(2)`B. lightC. temperatureD. water |
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Answer» Correct Answer - B According to the principle of limiting factor, the rate of theprocess is limited by the pace of the slowest factor. Light intensity varies with latitude, altitude, season, topography, presence or absence of interceptors like cloud, dust, fog, humidity, etc. In eastern states, low light intensity during monsoon result in low photosynthesis and hence, lesser yield. |
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| 664. |
Kranz anatomy is typical ofA. `C_(4)`-plantsB. `C_(3)`-plantsC. `C_(2)`-plantsD. CAM plants |
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Answer» Correct Answer - A Leaves of `C_(4)`-plants (e.g.sugarcane, maize) are characterised by Kranz anatomy in which the mesophyll is undifferentiated and its cells occur in concentric layers around vascular bundles. Vascular bundles are surrounded by large sized bundle sheath cells which are arranged in a wreath-like manner (Kranz-wreath). |
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| 665. |
Which technique has helped in inverstigation of calvin cycle ?A. X-ray crystallographyB. X-ray techniqueC. Radioactive isotope techniqueD. Intermittent light |
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Answer» Correct Answer - C Calvin, benson and basshan utilised `C^(14)` (with long life) to trace the path of carbon in photosynthesis. Calvin was awarded nobel prize in 1961 in recomgnition to his work with `C^(14)` isotope. He discovered the cycleinvolved in carbon assimilation, known as calvin cycle or `C_(3)`-cycle. |
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| 666. |
Name the external factors that affect the rate of photosynthesis |
| Answer» Correct Answer - Availability of sunlight, temperature, `CO_(2)` concentration and water. | |
| 667. |
Consider the following statements (A) The portion of the spectrum between 500nm and 800 nm is also referred to as photosynthetically active radiation (PAR) (B) Magnesium, calcium and chloride ions play prominet roles in the photolysis of water (C) In cyclic photopphosphorylation, oxygen is not released (as there is no photolysis of water) and NADPH is also not producedA. I is true , but II and III is falseB. I and II are false , but III is trueC. II is true, but I and III are falseD. I and II are true , but III is false |
| Answer» Correct Answer - C | |
| 668. |
Plants living in hot humid environment areA. `C_(3)` plantsB. CAM plantsC. `C_(4)` plantsD. All of the above |
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Answer» Correct Answer - C Plants living in hot humid environment are `C_(4)` plants. |
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| 669. |
`C_4`-plants are found amongA. dicotsB. monocotsC. Both (a) and (b)D. in family -Poaceae (Gramineae) |
| Answer» Correct Answer - C | |
| 670. |
Bacteriochlorophyll differs from chlophyll `a` in havingA. One pyroll ring with one hydrogenB. One pyroll ring with two hydrogenC. One pyroll ring with three hydrogenD. One pyroll ring with four hydrogen |
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Answer» Correct Answer - B Purple sulphur bacteria and non-sulphur bacteria contain bacterio-chlorophyll, which is having 2H-atoms more than chl. A and it absorbs 850-950 nm (infra-red) wavelength of light. |
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| 671. |
The reaction centre of bacteriochlorophyll isA. `P_(670)`B. `P_(890)`C. `P_(680)`D. `P_(700)` |
| Answer» Correct Answer - B | |
| 672. |
Which of the following statements is true for photosynthesis?A. Dark reactions occur only in darkB. Dark and light reactions always occur simultaneouslyC. Dark reactions occur only when light reactions stopD. Dark reactions may also occur in dark |
| Answer» Correct Answer - D | |
| 673. |
A student sets up an expirment on photoysthesis as folows : He takes soda water in a glass tumbler and adds chloroplyll into the contents and keeps the tumbler exposed to sunlight hoping that he has provided necessary ingredients for photosynthesis to proceed ( viz. `CO_(2), H_(2)O,` chlorophyll, and light). What do you think what happens after, say a few hours of exposure of light ?A. Photosynthesis will take place and glucose will be producedB. Photosynthesis will take place and starch will be produced which trun the mixture turbid.C. Photosynthesis will not take place because `CO_(2)` dissoved in soda water escapes into the atmosphereD. Photosynthesis will not take place because intact chloroplasts are needed for the process. |
| Answer» Correct Answer - D | |
| 674. |
Assertion : In oxidative phosphorylation , the electrons flow from NADH to `O_(2)`. Reason :In photosynthesis , the electrons flow from `H_(2)O` to NADP.A. If both A and R are true and R is the correct explanation of AB. If both A and R are true but R is not the correct explanation of AC. If A is true but R is falseD. If both A and R are false |
| Answer» Correct Answer - B | |
| 675. |
Which of the following is wrongly matched `{:(,(a),"Sorghum",-"Kranz anatomy"),(,(b),"PEP carboxyles",-"Mesophyll cell"),(,(c ),"Blackmen",-"Law of limiting factors"),(,(d),"Photorespiration",-C_(3)"plants"),(,(e),PS II,-P700):}`A. AB. BC. ED. C |
| Answer» Correct Answer - C | |
| 676. |
Consider the following statements regarding photosynthesis (A) ATP formation during photosynthesis is temed as photophosphorylation (B) Kranz anatomy pertains to leaf (C) Reduction of `NADP^(+)` to NADPH occurs during Calvin cycle (D) In a chlorophyll molecule mangesium is present in phytol tailA. I and II are correctB. III and IV are correctC. I and III are correctD. I and IV are correct |
| Answer» Correct Answer - A | |
| 677. |
The precentag of light energy utilized for photosynthesis by higher plants isA. `100%`B. `50%`C. `10%`D. `1 "to" 2%` |
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Answer» Correct Answer - D Only 1-4% light is utilized in photosynthesis. I general rate of photosynthesis is jmore in intense light than diffused light. |
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| 678. |
Ribulose diphosphate carboxylase oxygenase is location inA. MitochondriaB. ChloroplastsC. PeroxisomesD. Golgi bobies |
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Answer» Correct Answer - B Rubisco constitutes 16% of chloroplast protein. It is the most abundant protein on this planet. |
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| 679. |
Carbon dioxide joins the photosynthetic pathway inA. PS IB. PS IIC. Light reactionD. Dark reaction |
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Answer» Correct Answer - D Carbon dioxide joins the photosynthetic pathway in dark reaction. |
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| 680. |
The path of `CO_(2)` in the dark reaction of photosynthetic was successfully traced by the use of the following or The dark reaction is traced byA. `O_(2)^(18)`B. `C^(14)O_(2)`C. `P^(32)`D. X-rays |
| Answer» Correct Answer - B | |
| 681. |
The path of `CO_(2)` in the dark reaction of photosynthetic was successfully traced by the use of the following or The dark reaction is traced byA. `O_(2)^(18)`B. `C^(14)O_(2)`C. `P^(36)`D. `X-rays` |
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Answer» Correct Answer - B Calvin traved the path in photosynthesis associated with dark reaction radioactive isotope of carbon `(C^(14))` is used, it is observed that `(C^(14)O_(2))` reduction of `CO_(2)` is definitely in dark reaction. |
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| 682. |
Ribulose diphosphate carboxylase enzyme catalyses the carboxylation reaction betweenA. Oxaloacetic acid and acetyl `CoA`B. `CO_(2)` and ribulose 1,5 diphosphateC. Ribulose diphosphate and phosphoglyceraldehydeD. PGA and dihydroxy acetone phosphate |
| Answer» Correct Answer - B | |
| 683. |
When a photosynthetic plant is transferred to an atmosphere of enriched `O_(2)`, its rate ofA. Photosynthesis would increaseB. Photosynthesis would decreaseC. Respiration would decreaseD. Osmosis would increase |
| Answer» Correct Answer - B | |
| 684. |
`CO_(2)` joins the photosynthetic duringA. Light reactionB. Dark reactionC. Photosystem-ID. Photosystem-II |
| Answer» Correct Answer - B | |
| 685. |
Photosynthetic oxygen-producing cells differ from non-oxygen producing cells in that the formerA. Produce three ATP whereas the latter produce fiveB. Produce no NADPH whereas the latter doC. Reduce ferredoxin whereas the latter do notD. Contain and use both photosystems I and II |
| Answer» Correct Answer - D | |
| 686. |
Optimum temperature for the photosynthetic process of ` C_(3)` plants isA. `20-25^(@)C`B. `10-20^(@)`C. `30-45^(@)`CD. `45-55^(@)`C |
| Answer» Correct Answer - A | |
| 687. |
Photosynthetic process utilitzes _______ of water absorbed by a plant.A. 0.1B. 0.15C. Less than 1%D. 0.05 |
| Answer» Correct Answer - C | |
| 688. |
Very strong light has a direct inhibiting effect on photosyntehsis , which is known asA. solarisationB. etiolationC. chlorosisD. defoliation |
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Answer» Correct Answer - A Usually with increase in light intensity the rate of photosynthesis increased. At very high light intensity the cells exhibit photooxidation by the process of solarisation and if it continues for few hours , the photosynthetic apparatus is destroyed. |
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| 689. |
The graph showing rate of photosynthesis at different wavelength of light is calledA. absorption spectrumB. action spectrumC. Both (a) and (b)D. None of these |
| Answer» Correct Answer - B | |
| 690. |
Optimum temperature for photosynthesis isA. `10-15^@C`B. `20-35^@C`C. `25-30^@C`D. `35-40^@C` |
| Answer» Correct Answer - C | |
| 691. |
Which of the following fator does not have direct effect on photosynithesis ?A. TemperatureB. waterC. Atmosheric `CO_(2)` concentrationD. Light |
| Answer» Correct Answer - B | |
| 692. |
Ferredoxin `e^(-)` acceptor is a component ofA. PS-IB. PS-IIC. Hill reactionD. `P_(680)` |
| Answer» Correct Answer - C | |
| 693. |
Coose incorrect w.r.t. photosynthesisA. it is a physico-chemical processB. Oxygen is evolved as a by- product in all photoautotrophsC. Occurs in unicellular and muiticellular photoaututrophsD. Anabolic and reductive process |
| Answer» Correct Answer - B | |
| 694. |
Study the given graph showing the efect of light intensity on the rate of photosynthesis. Which of the following statemetns regarding this is correct? A. Light is a limiting factor in the region a.B. Region C represents that rate of photosynthesis is because some other factor became limiting.C. point D rrepresents the intensity of light at which some other factor became limitingD. All of these |
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Answer» Correct Answer - D A limiting factor is defined as a factor which is deficient to such an extent that increase in its magnitude directly increaes the rate of the process. In the given graph, rate of photosynthesis initially increaes with an increase in light intesntiy (region A) but soon it levelled off. Thus. initially light intensity was limiting the rate of photosynthesis. Hoever, when light intensity was present in sufficient amounts (region C), rate of photosynthesis did not increase further. This is due to the fact that in region C, some other factor (e.g. `CO_(2)` concentration) became the limiting factor. At this region, the rate of photosynthesis could be further enhanced only by the increase in availability of other limiting factor (e.g. `CO_(2)`) |
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| 695. |
Optimum temperature conditions for photosynthesis in `C_(3)` and `C_(4)` plants are respectivelyA. `10^(@)C-25^(@)C` and `30^(@)45^(@)C`B. `30^(@)C-45^(@)C` and `10^(@)C-25^(@)C`C. `0^(@)C-10^(@)C` and `10^(@)C-30^(@)C`D. `25^(@)C-30^(@)C` and `40^(@)C-50^(@)C`. |
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Answer» Correct Answer - A Active site of RuBisCO for carboxylation and oxgenation is the same. The enzyme has more affinity for `CO_(2)` as compared to oxygen. Active oxygenation occurs only when `CO_(2):O_(2)` ratio favours it. |
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| 696. |
In Zea Mays optimum `CO_(2)` concentration for photosynthesis isA. 450 ppmB. 360 ppmC. 0-10 ppmD. 10-20 ppm |
| Answer» Correct Answer - B | |
| 697. |
Optimum temperature for photosynthesis in `C_4` plants isA. `10-20^@C`B. `15-25^@C`C. `30-45^@C`D. `50-60^@C` |
| Answer» Correct Answer - C | |
| 698. |
Plants requiring low light intensity for optimum photosynthesis is called:A. BryophytesB. PteridophytesC. HeliophytesD. Sciophytes |
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Answer» Correct Answer - D Plants requiring low light intensity for optimum photosynthesis are called sciophytes. |
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| 699. |
What is trne about compensation point in `C_(3)` and `C_(4)` plants?A. Compensation point of `C_(3)` plants is higherB. Compensation point of `C_(4)` plants is lowerC. Both A and BD. None of these |
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Answer» Correct Answer - C Compensation point of `C_(3)` plants is higher and compensation point of `C_(4)` plants is lower. |
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| 700. |
Given table shows the `CO_(2)` compensation point and optimum `CO_(2)` concentration for photosynthesis for `C_(3)` and `C_(4)` plants. `|(ul(" " C_(3) " Plants" " " C_(4)" Plants")),(ul(underset("point")(CO_(2)" compensation")" "25-100 "ppm" " "A " ")),(ul(underset("cocentration")("Optimum " Co_(2)) " " "B 360 ppm"))|` Select the correct values for A and B.A. `{:(A,B),(0.50"ppm",300"ppm"):}`B. `{:(A,B),(0-10"ppm",450"ppm"):}`C. `{:(A,B),(100-150"ppm",250"ppm"):}`D. `{:(A,B),(100-110"ppm",290"ppm"):}` |
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Answer» Correct Answer - B `CO_(2)` compensation poin t or threshold value is that concentration of `CO_(2)` at which illuminated plant parts parts stop absorbing carbon dioxide from their enviroment. At this value, `CO_(2)` fixed in photosynthesis is equal to `CO_(2)` evolved in respiration and photorespiration. The value is 25-100 ppm compensation value for `C_(4)` plants is the greater efficiency of `CO_(2)`-fixation through PEP-carboxylase. The optimum `CO_(2)` concentration for `C_(4)` plants is 360 ppm and for `C_(3)` plants, it is 50ppm. |
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