490 + Interview Questions in PHOTOSYNTHESIS IN GENERAL AWARENESS Page 1 InterviewSolution

1.	Complete girdling ultimately kills the tree due toA. Starvation of rootB. Stoppage of photosynthesisC. Non-movement of mineralsD. Non-movement of water.
Answer» Correct Answer - A

Discussion

2.	A tree is believed to be releasing oxygen during night time. Do you believe the truthfulness of this statement? Justify your answer by giving reasons?
Answer» Yes, a tree is believed to be releasing O₂ during night time because at night CAM plants fix CO₂ with the help of phospho Enol Pyruvic acid and produce oxala acetic acid, which is converted into malic acid like C₄ cycle.

Discussion

3.	Which would do maximum harm to a tree?(a) Loss of half of its branches (b) Loss of half of its flowers(c) Loss of all of its leaves (d) Loss of a little bark
Answer» (c) Loss of all of its leaves

Discussion

4.	NADP is expanded as:(a) Nicotinamide, adenosi ne dinucleotide phosphate(b) Nicotinamide, adenine dinucleotide phosphate(c) Nicotinamide, adenine dinucleous phosphate(d) Nicotinamide, adenosine dinudeous phosphate
Answer» (b) Nicotinamide, adenine dinucleotide phosphate

Discussion

5.	A plant is kept in a dark cupboard for about 48 hours before conducting any experiment on photosynthesis to:(a) Remove starch from the plant(b) Ensure that starch is not translocated from the leaves(c) Remove chlorophyll from the leaf of the plant(d) Remove starch from the experimental leaf
Answer» (b) Ensure that starch is not translocated from the leaves

Discussion

6.	The main difference between chlorophyll ‘a’ and ‘b’ is:(a) Chlorophyll ‘a’ is a linear chain compound and ‘b’ is b ranched chain(b) Chlorophyll ‘a’ has no Mg ion in centre of molecule(c) In chlorophyll ‘a’ there is — CH3 group whereas in ‘b’ it is — CHO group(d) All of the above
Answer» (c) In chlorophyll ‘a’ there is — CH₃group whereas in ‘b’ it is — CHO group

Discussion

7.	Plants do not store carbohydrate as glucose but do so as starch because glucoseA. Is unstableB. Attracts herbivoresC. Will change nucleic acidsD. Alters osmotic balance.
Answer» Correct Answer - D

Discussion

8.	Compensation point means the condition:(a) When the entire food manufactured in photosynthesis remains unutilised(b) When the pot is watered just to meet the full requirement of the plant(c) When rate of photosynthesis is equal to rate of respiration(d) Where there is neither photosynthesis nor respiration.
Answer» (c) When rate of photosynthesis is equal to rate of respiration

Discussion

9.	`ETC` of photosynthesis process isA. Bound to thylakoid membraneB. Present in stromaC. Bound to outer chloroplast membraneD. Dispersed in sytosol.
Answer» Correct Answer - A

Discussion

10.	Which one is photophosphorylationA. `ADP+AMP overset("Light energy")(rarr) ATP`B. `ADP+" Inorganic phosphate" overst("Light energy")(rarr) ATP`C. `ADP+" Inorganic" PO_(4) rarr ATP`D. `AMP+" Inorganic" PO_(4) overset("Light energy")(rarr) ATP`.
Answer» Correct Answer - B

Discussion

11.	Maximum starch is manufactured byA. Spongy paranchymaB. Palisade parencymaC. Guard cellsD. Vascular tissue.
Answer» Correct Answer - B

Discussion

12.	Maximum photosynthesis ocu=curs in lightA. RedB. GreenC. Very high lightD. Continuous light.
Answer» Correct Answer - D

Discussion

13.	The process in which exces energy is lost by light waves is calledA. FluorescenceB. PhotooxidationC. PhotolysisD. Photophosphorylation.
Answer» Correct Answer - A

Discussion

14.	Define Plastoquinone.
Answer» Plastoquinone: A small molecule involved in electron and proton transfer in photosynthesis.

Discussion

15.	When does photorespiration occur?
Answer» 1. Photorespiration occurs under the conditions like high temperature, bright light, high oxygen and low CO₂ concentration. It is a wasteful process linked with C₃-Cycle, where instead of fixation of CO₂ , it is given out. 2. Photorespiration is a respiratory process in many higher plants by which they take up oxygen in the light and give outiearbon dioxide.

15.

When does photorespiration occur?

Answer»

1. Photorespiration occurs under the conditions like high temperature, bright light, high oxygen and low CO₂ concentration. It is a wasteful process linked with C₃-Cycle, where instead of fixation of CO₂ , it is given out.

2. Photorespiration is a respiratory process in many higher plants by which they take up oxygen in the light and give outiearbon dioxide.

Discussion

16.	Who discovered the Carbon fixation pathway? How was the pathway studied?
Answer» 1. The path of carbon fixation in dark reaction through intermediate compounds leading to the formation of sugar and starch was discovered by Calvin, Benson and their co-workers discovered the carbon fixation pathway. 2. Path of carbon was studied with the help of radioactive tracer technique using Chlorella, a unicellular green alga and radioactive ¹⁴CO₂ . 3. With the help of radioactive carbon, it becomes possible to trace the intermediate steps of fixation of ¹⁴CO₂ .

16.

Who discovered the Carbon fixation pathway? How was the pathway studied?

Answer»

1. The path of carbon fixation in dark reaction through intermediate compounds leading to the formation of sugar and starch was discovered by Calvin, Benson and their co-workers discovered the carbon fixation pathway.

2. Path of carbon was studied with the help of radioactive tracer technique using Chlorella, a unicellular green alga and radioactive ¹⁴CO₂ .

3. With the help of radioactive carbon, it becomes possible to trace the intermediate steps of fixation of ¹⁴CO₂ .

Discussion

17.	In C pathway, fixation of metabolic CO occurs in which of the following cells? (A) Bundle sheath cells (B) Mesophyll cells (C) Epidermal cells (D) Cortical cells
Answer» The correct answer is (A) Bundle sheath cells

Discussion

18.	How many ATPs are required by `C_(4)` plants in synthesis of one molecule of glucoseA. 18 ATPB. 30 ATPC. 12 ATPD. None of the above.
Answer» Correct Answer - B

Discussion

19.	How was the carbon fixation pathway studied?
Answer» 1. Path of carbon was studied with the help of radioactive tracer technique using Chlorella, a unicellular green alga and radioactive¹⁴CO₂ . 2. With the help of radioactive carbon, it becomes possible to trace the intermediate steps of fixation of ¹⁴CO₂

19.

How was the carbon fixation pathway studied?

Answer»

1. Path of carbon was studied with the help of radioactive tracer technique using Chlorella, a unicellular green alga and radioactive¹⁴CO₂ .

2. With the help of radioactive carbon, it becomes possible to trace the intermediate steps of fixation of ¹⁴CO₂

Discussion

20.	The time taken from the fixation of `CO_(2)` to the formation of one glucose molecules is about…………………. SecondsA. 20B. 40C. 60D. 90
Answer» Correct Answer - D

Discussion

21.	In `C_4)` pathway, `CO_(2)` fixation in mesophyll cells is carried out by the enzymeA. PEP carboxylaseB. Pyruvate dehydrogenaseC. RubiscoD. Pyruvate decarboxylase.
Answer» Correct Answer - A

Discussion

22.	The substrate for photorespiration isA. Phosphoglyceric acidB. GlycolateC. SerineD. Glycine.
Answer» Correct Answer - B

Discussion

23.	In `C_(4)` plants, synthesis of sugars occurs inA. Mesophyll cellsB. Bundle sheath cellsC. Spongy parenchyma cellsD. Palisada parenchyma cells.
Answer» Correct Answer - B

Discussion

24.	Maximum `CO_(2)` fixation occurs inA. PhytoplanktonB. BacteriaC. Green plantsD. Zooplankton.
Answer» Correct Answer - A

Discussion

25.	`C_(4)` pathway of `CO_(2)` fixation was discovered byA. BlackmanB. Hatch and SlackC. Emerson and ArnoldD. Arnon.
Answer» Correct Answer - B

Discussion

26.	The products of photochemical reaction areA. `O_(2), ATP` and `NADPH`B. `O_(2)`C. `ATP` and `NADPH`D. Organic compounds especially carbohydrates.
Answer» Correct Answer - A

Discussion

27.	Both respiration and photosynthesis requireA. SunlightB. Green cellsC. CytochromesD. Organic substarate.
Answer» Correct Answer - C

Discussion

28.	Algae employed by Calvin et al in experiments on photosynthesis belong toA. Euglena and ScendesmusB. CharaC. Chlamydomonas and ChlorellaD. Chlorella and Scenedesmus.
Answer» Correct Answer - D

Discussion

29.	In `C_(4)` plants, synthesis of sugars/final `CO_(2)` fixation occurs inA. Palisade cellsB. Spongy cellsC. Undifferentiated mesophyll cellsD. Bundle sheath cells
Answer» Correct Answer - D

Discussion

30.	Isotopes popularly know to have been used in the study of photosynthesis are or Which of the following isotope of carbon was by Calvin to trace the path of carbon in photosynthesisA. `.^(11)C` and `.^(32)P`B. `.^(15)C` and `.^(32)P`C. `.^(16)C` and `.^(15)N`D. `.^(14)C` and `.^(18)O`.
Answer» Correct Answer - D

Discussion

31.	Photosynthesis is considered as an oxidation reaction, becauseA. `CO_(2)` is oxidisedB. `H_(2)O` is oxidisedC. `O_(2)` is releasedD. `(CH_(2)O)` is oxidised
Answer» Correct Answer - B

Discussion

32.	A photosynthesis cell is provided with `.^(14)CO_(2)` and `H_(2) .^(18)O`. They formA. `C_(6)H_(12)O_(6)+O_(2)`B. `.^(14)C_(6)H_(12)O_(6)+O_(2)`C. `.^(14)C_(6)H_(12)O_(6)+.^(18)O_(2)`D. `C_(6)H_(12)O_(6)+O_(2)`.
Answer» Correct Answer - C

Discussion

33.	A plant is provided with ideal conditions for photosynthesis and supplied with isotope `.^(14)CO_(2)`. When the products of the process are analysed carefully, what would be nature of productsA. Both glucose and oxygen are labelledB. Only oxygen is labelled but glucose is normalC. Both glucose and oxygen are normalD. Only glucose is labelled and oxygen is normal.
Answer» Correct Answer - D

Discussion

34.	First transitory chemical formed by reaction between `CO_(2)` and RuBP isA. `PGAL//GAP`B. `PGA`C. 2-carboxy 3-keto, 1, 5-bisphosphoribotolD. `DiHAP`.
Answer» Correct Answer - C

Discussion

35.	In `C_(4)` pathway, `RuBP` receives `CO_(2)` fromA. Pyruvic acidB. PEP AC. OAAD. Malic acid.
Answer» Correct Answer - D

Discussion

36.	Are the enzymes that catalyze the dark reactions of carbon fixation located inside the thylakoids or outside the thylakoids?
Answer» Carbon fixation occurs in the stroma by series of enzyme catalyzed steps. The enzymes that catalyze the dark reactions of carbon fixation are located outside the thylakoids.

Discussion

37.	Write the dark reaction occurring in stroma.
Answer» 6O₂ + 18ATP + 12NADPH₂ → C₆H₁₂O₆ + 6H₂O + 18ADP +18Pi + 12NADP⁺

Discussion

38.	PGA as the first `CO_(2)` fixation product was discovered in photosynthesis ofA. GymnospermsB. AngiospermsC. AlgaD. Bryophyte.
Answer» Correct Answer - C

Discussion

39.	Chlorophylls absorb visible light of wavelengthsA. 400-500 nm onlyB. 300-400 nm onlyC. 600-800 nm onlyD. 400-500 nm and 600-700 nm.
Answer» Correct Answer - D

Discussion

40.	Ferredoxin isA. PhenolB. ProteinC. FatD. Carbohydrate.
Answer» Correct Answer - B

Discussion

41.	During dark reaction for fixation of carbon, the three carbon atoms of each molecule of 3-phosphoglyceric acid (PGA) are derived fromA. `RuBP` onlyB. `CO_(2)` onlyC. `RuBP+CO_(2)`D. `RuBP+CO_(2)+PEP`.
Answer» Correct Answer - C

Discussion

42.	Three carbons of phosphoglyceric acid formed during carbon fixation are derived fromA. `PEP+CO_(2)`B. `RuBP`C. `CO_(2)`D. `RuBP+CO_(2)`.
Answer» Correct Answer - D

Discussion

43.	Formation of phosphoglyceraldehyde from phosphoglyceric acid isA. HydrolysisB. OxidationC. ReductionD. Electrolysis.
Answer» Correct Answer - C

Discussion

44.	Grind the spinach leaves in small quantity of acetone / nail paint remover. Mix the contents properly and filter with filter paper in test tube. Test tube contains green filtrate. Take the test tube in dark-room and put a flash of torch on it. Now, solution appears red. Why does this occur? Which phenomenon is this? Discuss this with your physics, chemistry and biology teachers.
Answer» Chlorophyll is the green pigment present in chloroplast. It absorbs light in red and blue region of visible spectrum. It does not absorb green light and thus the green light is reflected which is why it appears green. In this experiment, the chlorophyll in test tube appears red when a flash torch is put on it in the dark room. This is because when the electrons of the chlorophyll molecule are excited in dark in the absence of electron transport chain the electrons release their energy in the form of red light as they return to ground state. This phenomenon observed here is transmission of light.

44.

Grind the spinach leaves in small quantity of acetone / nail paint remover. Mix the contents properly and filter with filter paper in test tube. Test tube contains green filtrate. Take the test tube in dark-room and put a flash of torch on it. Now, solution appears red. Why does this occur? Which phenomenon is this? Discuss this with your physics, chemistry and biology teachers.

Answer»

Chlorophyll is the green pigment present in chloroplast. It absorbs light in red and blue region of visible spectrum. It does not absorb green light and thus the green light is reflected which is why it appears green. In this experiment, the chlorophyll in test tube appears red when a flash torch is put on it in the dark room.

This is because when the electrons of the chlorophyll molecule are excited in dark in the absence of electron transport chain the electrons release their energy in the form of red light as they return to ground state. This phenomenon observed here is transmission of light.

Discussion

45.	A part of photosynthetically fixed CO2 goes back to the atmosphere due to _______. (A) cyclic photophosphorylation (B) noncyclic photophosphorylation (C) dark reaction (D) photorespiration
Answer» The correct answer is (D) photorespiration

Discussion

46.	Chlorophyll was first extracted byA. Van MayerB. Pelletier and CaventouC. Willstatter and StollD. Senebier.
Answer» Correct Answer - B

Discussion

47.	Wavelength of light least effective in photosynthesis isA. VioletB. BlueC. GreenD. Red.
Answer» Correct Answer - C

Discussion

48.	The source of hydrogen for carbon assimilation isA. `NADPH`B. `FADH_(2)`C. `H_(2)O`D. `RuBP`
Answer» Correct Answer - A

Discussion

49.	The number of carbon atoms present in ribulose biphosphate isA. 6B. 5C. 4D. 3
Answer» Correct Answer - B

Discussion

50.	Correct sequence of involvement of the following in noncyclic electron transport (i) `PC` (ii) `PQ` (iii) `Pheo` (iv) `Fd`A. `ii, i, iii, iv`B. `iii, ii, iv, i`C. `iv, i, ii, iii`D. `iii, ii, i, iv`.
Answer» Correct Answer - D

Discussion

Explore topic-wise InterviewSolutions in .

Complete girdling ultimately kills the tree due toA. Starvation of rootB. Stoppage of photosynthesisC. Non-movement of mineralsD. Non-movement of water.

A tree is believed to be releasing oxygen during night time. Do you believe the truthfulness of this statement? Justify your answer by giving reasons?

Which would do maximum harm to a tree?(a) Loss of half of its branches (b) Loss of half of its flowers(c) Loss of all of its leaves (d) Loss of a little bark

NADP is expanded as:(a) Nicotinamide, adenosi ne dinucleotide phosphate(b) Nicotinamide, adenine dinucleotide phosphate(c) Nicotinamide, adenine dinucleous phosphate(d) Nicotinamide, adenosine dinudeous phosphate

A plant is kept in a dark cupboard for about 48 hours before conducting any experiment on photosynthesis to:(a) Remove starch from the plant(b) Ensure that starch is not translocated from the leaves(c) Remove chlorophyll from the leaf of the plant(d) Remove starch from the experimental leaf

Plants do not store carbohydrate as glucose but do so as starch because glucoseA. Is unstableB. Attracts herbivoresC. Will change nucleic acidsD. Alters osmotic balance.

`ETC` of photosynthesis process isA. Bound to thylakoid membraneB. Present in stromaC. Bound to outer chloroplast membraneD. Dispersed in sytosol.

Which one is photophosphorylationA. `ADP+AMP overset("Light energy")(rarr) ATP`B. `ADP+" Inorganic phosphate" overst("Light energy")(rarr) ATP`C. `ADP+" Inorganic" PO_(4) rarr ATP`D. `AMP+" Inorganic" PO_(4) overset("Light energy")(rarr) ATP`.

Maximum starch is manufactured byA. Spongy paranchymaB. Palisade parencymaC. Guard cellsD. Vascular tissue.

Maximum photosynthesis ocu=curs in lightA. RedB. GreenC. Very high lightD. Continuous light.

The process in which exces energy is lost by light waves is calledA. FluorescenceB. PhotooxidationC. PhotolysisD. Photophosphorylation.

Define Plastoquinone.

When does photorespiration occur?

Who discovered the Carbon fixation pathway? How was the pathway studied?

In C pathway, fixation of metabolic CO occurs in which of the following cells? (A) Bundle sheath cells (B) Mesophyll cells (C) Epidermal cells (D) Cortical cells

How many ATPs are required by `C_(4)` plants in synthesis of one molecule of glucoseA. 18 ATPB. 30 ATPC. 12 ATPD. None of the above.

How was the carbon fixation pathway studied?

The time taken from the fixation of `CO_(2)` to the formation of one glucose molecules is about…………………. SecondsA. 20B. 40C. 60D. 90

In `C_4)` pathway, `CO_(2)` fixation in mesophyll cells is carried out by the enzymeA. PEP carboxylaseB. Pyruvate dehydrogenaseC. RubiscoD. Pyruvate decarboxylase.

The substrate for photorespiration isA. Phosphoglyceric acidB. GlycolateC. SerineD. Glycine.

In `C_(4)` plants, synthesis of sugars occurs inA. Mesophyll cellsB. Bundle sheath cellsC. Spongy parenchyma cellsD. Palisada parenchyma cells.

Maximum `CO_(2)` fixation occurs inA. PhytoplanktonB. BacteriaC. Green plantsD. Zooplankton.

`C_(4)` pathway of `CO_(2)` fixation was discovered byA. BlackmanB. Hatch and SlackC. Emerson and ArnoldD. Arnon.

The products of photochemical reaction areA. `O_(2), ATP` and `NADPH`B. `O_(2)`C. `ATP` and `NADPH`D. Organic compounds especially carbohydrates.

Both respiration and photosynthesis requireA. SunlightB. Green cellsC. CytochromesD. Organic substarate.

Algae employed by Calvin et al in experiments on photosynthesis belong toA. Euglena and ScendesmusB. CharaC. Chlamydomonas and ChlorellaD. Chlorella and Scenedesmus.

In `C_(4)` plants, synthesis of sugars/final `CO_(2)` fixation occurs inA. Palisade cellsB. Spongy cellsC. Undifferentiated mesophyll cellsD. Bundle sheath cells

Isotopes popularly know to have been used in the study of photosynthesis are or Which of the following isotope of carbon was by Calvin to trace the path of carbon in photosynthesisA. `.^(11)C` and `.^(32)P`B. `.^(15)C` and `.^(32)P`C. `.^(16)C` and `.^(15)N`D. `.^(14)C` and `.^(18)O`.

Photosynthesis is considered as an oxidation reaction, becauseA. `CO_(2)` is oxidisedB. `H_(2)O` is oxidisedC. `O_(2)` is releasedD. `(CH_(2)O)` is oxidised

A photosynthesis cell is provided with `.^(14)CO_(2)` and `H_(2) .^(18)O`. They formA. `C_(6)H_(12)O_(6)+O_(2)`B. `.^(14)C_(6)H_(12)O_(6)+O_(2)`C. `.^(14)C_(6)H_(12)O_(6)+.^(18)O_(2)`D. `C_(6)H_(12)O_(6)+O_(2)`.

First transitory chemical formed by reaction between `CO_(2)` and RuBP isA. `PGAL//GAP`B. `PGA`C. 2-carboxy 3-keto, 1, 5-bisphosphoribotolD. `DiHAP`.

In `C_(4)` pathway, `RuBP` receives `CO_(2)` fromA. Pyruvic acidB. PEP AC. OAAD. Malic acid.

Are the enzymes that catalyze the dark reactions of carbon fixation located inside the thylakoids or outside the thylakoids?

Write the dark reaction occurring in stroma.

PGA as the first `CO_(2)` fixation product was discovered in photosynthesis ofA. GymnospermsB. AngiospermsC. AlgaD. Bryophyte.

Chlorophylls absorb visible light of wavelengthsA. 400-500 nm onlyB. 300-400 nm onlyC. 600-800 nm onlyD. 400-500 nm and 600-700 nm.

Ferredoxin isA. PhenolB. ProteinC. FatD. Carbohydrate.

During dark reaction for fixation of carbon, the three carbon atoms of each molecule of 3-phosphoglyceric acid (PGA) are derived fromA. `RuBP` onlyB. `CO_(2)` onlyC. `RuBP+CO_(2)`D. `RuBP+CO_(2)+PEP`.

Three carbons of phosphoglyceric acid formed during carbon fixation are derived fromA. `PEP+CO_(2)`B. `RuBP`C. `CO_(2)`D. `RuBP+CO_(2)`.

Formation of phosphoglyceraldehyde from phosphoglyceric acid isA. HydrolysisB. OxidationC. ReductionD. Electrolysis.

A part of photosynthetically fixed CO2 goes back to the atmosphere due to _______. (A) cyclic photophosphorylation (B) noncyclic photophosphorylation (C) dark reaction (D) photorespiration

Chlorophyll was first extracted byA. Van MayerB. Pelletier and CaventouC. Willstatter and StollD. Senebier.

Wavelength of light least effective in photosynthesis isA. VioletB. BlueC. GreenD. Red.

The source of hydrogen for carbon assimilation isA. `NADPH`B. `FADH_(2)`C. `H_(2)O`D. `RuBP`

The number of carbon atoms present in ribulose biphosphate isA. 6B. 5C. 4D. 3

Correct sequence of involvement of the following in noncyclic electron transport (i) `PC` (ii) `PQ` (iii) `Pheo` (iv) `Fd`A. `ii, i, iii, iv`B. `iii, ii, iv, i`C. `iv, i, ii, iii`D. `iii, ii, i, iv`.