490 + Interview Questions in PHOTOSYNTHESIS IN GENERAL AWARENESS Page 4 InterviewSolution

151.	Why green leaves are thin and broad ?
Answer» Green leaves are thin and broad so that they can receive more light and can photosynthesize more efficiently.

Discussion

152.	Leaves are green because theyA. Absorb green lightB. Do not absorb but reflect green lightC. Utilise green lightD. Absorb and reflect green light.
Answer» Correct Answer - B

Discussion

153.	Cyclic photosphorylation results in the formation ofA. `NADPH + H^(+)`B. `ATP` and `NADPH + H^(+)`C. `ADP`D. `ATP`
Answer» Correct Answer - D

Discussion

154.	cyclic photosphorylation is carried out byA. `PS` I onlyB. `PS` II onlyC. Both A and BD. Photolysis and `PS` II.
Answer» Correct Answer - A

Discussion

155.	Cyclic photosphorylation producesA. `NADPH`B. `ATP` and `NADPH`C. `ATP, NADPH` and `O_(2)`D. `ATP` only.
Answer» Correct Answer - D

Discussion

156.	Which of the following factors is not limiting? (A) CO concentration (B) Light intensity (C) Temperature (D) Oxygen
Answer» The correct answer is (D) Oxygen

Discussion

157.	Why photosynthesis is known as redox reaction?
Answer» 1. Photosynthesis is considered as a redox reaction as it involves both reduction and oxidation reactions. 2. Water is oxidized by the removal of H⁺ while CO₂ is reduced by the addition of H⁺. 3. The redox reactions of photosynthesis are necessary for the conversion of light energy into chemical energy.

157.

Why photosynthesis is known as redox reaction?

Answer»

1. Photosynthesis is considered as a redox reaction as it involves both reduction and oxidation reactions.

2. Water is oxidized by the removal of H⁺ while CO₂ is reduced by the addition of H⁺.

3. The redox reactions of photosynthesis are necessary for the conversion of light energy into chemical energy.

Discussion

158.	Give reason. Why photosynthesis is a redox reaction?
Answer» Photosynthesis is considered as a redox reaction as it involves both reduction and oxidation reactions. Water is oxidized by the removal of H⁺ while CO₂ is reduced by the addition of H⁺ . The redox reactions of photosynthesis are necessary for the conversion of light energy into chemical energy.

Discussion

159.	Assimilatory power isA. `NADPH_(2)`B. `ATP`C. `ATP` and `NADPH_(2)`D. `FADH_(2)`.
Answer» Correct Answer - C

Discussion

160.	PS-I hasA. More chlorophylla and more accessory pigmentsB. More chlorophylls and less accessory pigmentsC. Less chlorophylls and more accessory pigmentsD. Less chlorophylls and less accessory photosynthetic pigments.
Answer» Correct Answer - A

Discussion

161.	Plants living in hot humid environment areA. `C_(3)` plantsB. `CAM` plantsC. `C_(4)` plantsD. All the above.
Answer» Correct Answer - D

Discussion

162.	Which plant shows chloroplast dimorphismA. WheatB. RiceC. Sugar BeetD. Sugarcane/`C_(4)` plant.
Answer» Correct Answer - D

Discussion

163.	Cytochromes areA. `O_(2)` acceptorsB. `H_(2)` acceptorsC. Electron acceptorsD. `H_(2)O` acceptors.
Answer» Correct Answer - C

Discussion

164.	Rate of phosynthesis is higher inA. Very high lightB. Red lightC. Green lightD. Continuous light.
Answer» Correct Answer - B

Discussion

165.	All types of plastids possess essentialy the same structure because theyA. Perform the same functionB. Store food material like starch, fat and proteinC. Occucr in aerial partsD. Can transform from one form to another.
Answer» Correct Answer - D

Discussion

166.	Bacterial photosynthesis involves………A. PS IB. PS IIC. Both PS I and PS IID. None of them.
Answer» Correct Answer - A

Discussion

167.	Chlorophyll a occurs inA. All photosunthetic autotrophsB. In all higher plantsC. All oxygen liberating autotrophsD. All plants except fungi.
Answer» Correct Answer - C

Discussion

168.	`ATP` isA. Adenine triphosphateB. Adenosine tetraphosphateC. Adenosine triphosphateD. Asdenine tetraphosphate.
Answer» Correct Answer - C

Discussion

169.	Bacterial photosynthesis differs from that of higher plants inA. Not liberating oxygenB. Non-requirement of lightC. Non-fixation of energyD. Requirement of host organism.
Answer» Correct Answer - A

Discussion

170.	Water releases protons. Twelve water molecules will realeaseA. `24 H^(+)`B. `48 H^(+)`C. `12 H^(+)`D. `6 H^(+)`
Answer» Correct Answer - A

Discussion

171.	`C_(4)` and `C_(3)` pathways of `CAM` plants are separated byA. Bundle sheathB. Mesophyll and bundle sheath cellsC. Mesophyll and bundle sheath chloroplastsD. Time.
Answer» Correct Answer - D

Discussion

172.	Steps in non-cyclic photophosphorylation include passage of electrons alongA. `FRS rarr FD rarr Cyt b_(6) rarr Cyt f rarr PC rarr Chl a`B. `Chl a rarr Cyt b_(6) rarr Cyt f rarr PC rarr PS I rarr FRS rarr FD`C. `Chl a rarr PQ rarr Cyt b_(6) rarr Cyt f rarr PC rarr PS I rarr FRS rarr FD`D. `PQ rarr Cyt b_(6) rarr Cyt f rarr PC rarr PS I rarr FRS rarr FD`.
Answer» Correct Answer - D

Discussion

173.	Select correct statement for photosynthesis – (a) CO and H2O are oxidized (b) CO2 and are H2O reduced (c) H2O is reduced and CO2 oxidized (d) H2O is oxidized and CO2 reduced
Answer» The answer is (d) H₂O is oxidized and CO₂ reduced

Discussion

174.	In PS-I and PS-II the reaction centers respectively are(a) P700 and P800(b) P600 and P700(c) P800 and P700(d) P700 and P680
Answer» The answer is P₇₀₀ and P₈₀₀

Discussion

175.	Photolysis of water necessarily requires – (a) Mn (b) Mg (c) Zn (d) Fe
Answer» The answer is (a) Mn

Discussion

176.	PS-II is related to – (a) Photolysis of water(b) Reduction of CO2(c) Flowering (d) All the above
Answer» The answer is (a) Photolysis of water

Discussion

177.	Which metal element is found in the center of the chlorophyll molecule? (a) Fe (b) Mg (c) Ne (d) Cu
Answer» The answer is (b) Mg

Discussion

178.	The core metal of chlorophyll is Or Which element is left when chlorophyll is burntA. `Cu`B. `Mg`C. `Fe`D. `Ni`.
Answer» Correct Answer - B

Discussion

179.	`RuBisCO` content of chloroplast isA. `20 %`B. `5 %`C. `11 %`D. `16 %`.
Answer» Correct Answer - D

Discussion

180.	The photosynthetic lamellae taken out from a chloroplast and suspended in a nutrient medium in the presence of CO2 and light. Will they synthesize sugar or not?
Answer» Photosynthetic ladmellae will not synthesize sugar because sugar synthesis occurs only in stroma, as all the enzymes required for sugar synthesis are present there. In photosynthetic lamellae only light reactions occur. Thus, lamellae cannot synthesize sugar even when CO₂ , light and other nutrients are provided.

Discussion

181.	What is meant by destarched plant ? How can it be destarched?
Answer» A destarched plant has no starch present in the leaves and a leaf remains yellowish-brown when tested with iodine during a starch test. A plant can be destarched by keeping it in the dark for two or three days so that the leaves are free from stored starch.

181.

What is meant by destarched plant ? How can it be destarched?

Answer»

A destarched plant has no starch present in the leaves and a leaf remains yellowish-brown when tested with iodine during a starch test.

A plant can be destarched by keeping it in the dark for two or three days so that the leaves are free from stored starch.

Discussion

182.	Solarisation isA. Formation of chlorophyllB. Destruction of chlorophyllC. Utilisation of sunlightD. Effect of solar light.
Answer» Correct Answer - B

Discussion

183.	Summarise the photosynthetic reaction.
Answer» 6CO₂ + 12H₂O → C₂H₁₂O₆+ 6O₂ + 6H₂O 1. Photosynthesis is a two step process. The light dependent reactions convert the light energy from the sun into chemical energy. The light independent reactions convert the chemical energy to synthesize carbohydrates. 2. Light dependent reactions: Light is absorbed by chlorophyll which results in the production of ATP. Photolysis of water produce oxygen and hydrogen. The hydrogen and ATP are used in the light independent reactions and the oxygen is released from stomata. 3. Light independent reactions: ATP and hydrogen are transferred to the site of light independent reactions. The hydrogen is combined with carbon dioxide to form complex organic compounds. The ATP provides the required energy to power these anabolic reactions and fix the carbon molecules.

183.

Summarise the photosynthetic reaction.

Answer»

6CO₂ + 12H₂O → C₂H₁₂O₆+ 6O₂ + 6H₂O

1. Photosynthesis is a two step process. The light dependent reactions convert the light energy from the sun into chemical energy. The light independent reactions convert the chemical energy to synthesize carbohydrates.

2. Light dependent reactions:

Light is absorbed by chlorophyll which results in the production of ATP. Photolysis of water produce oxygen and hydrogen. The hydrogen and ATP are used in the light independent reactions and the oxygen is released from stomata.

3. Light independent reactions:

ATP and hydrogen are transferred to the site of light independent reactions. The hydrogen is combined with carbon dioxide to form complex organic compounds.

The ATP provides the required energy to power these anabolic reactions and fix the carbon molecules.

Discussion

184.	During monsoon, the rice crop of eastern states of India shows lesser yield due to limiting factor ofA. `CO_(2)`B. LightC. TemperatureD. Water.
Answer» Correct Answer - B

Discussion

185.	A leaf is a food factory. Explain.
Answer» The leaves of green plants are specially developed for the purpose of synthesizing food. The leaf anatomy is best suited for collecting the raw materials. The leaf absorbs CO₂ from the atmosphere through its stomatal openings. It gets water from the stem. The chloroplasts are the actual sites of photosynthetic reactions light and dark reactions which result in the formation of glucose. Hence, the ability to collect raw materials and to carry on chemical reactions to synthesize food, it is called as the food factory of the plant.

Discussion

186.	Explain the term Photosynthetic Membrane.
Answer» A bilayer of lipid molecules in which are embedded proteins that transform light’energy into chemical free energy. (Also known as the thylakoid membrane.)

Discussion

187.	What does ATP abbreviated for?
Answer» Adenosine Triphosphate

Discussion

188.	What does NADP stand for ?
Answer» Nicotinamide Adenine Dinucleotide Phosphate

Discussion

189.	Define Phosphorylation.
Answer» Phosphorylation: The covalent attachment of a phosphate group to a molecule.

Discussion

190.	The part of the chloroplast where the dark reaction of photosynthesis takes place.
Answer» Stroma the part of the chloroplast where the dark reaction of photosynthesis takes place.

Discussion

191.	Explain the term NADP.
Answer» NADP (Nicotinamide Adenine dinucleotide phosphate): It is a coenzyme. During election transfer NADP get reduced and (from NADP + H (NADPH₂).

Discussion

192.	Ratio between 2-carbon and 3-carbon intermediate having `NH_(2)` group formed in photosynthetic oxidation cycle isA. `2 : 1`B. `1 : 1`C. `3 : 2`D. `3 : 4`
Answer» Correct Answer - A

Discussion

193.	Define Carbon cycle.
Answer» The various processes resulting in the circulation of carbon in different forms constitute the carbon cycle.

Discussion

194.	The process by which plants produce their food.
Answer» Photosynthesis

Discussion

195.	the site for light reaction isA. GranaB. StromaC. ERD. Cytoplasm.
Answer» Correct Answer - A

Discussion

196.	(i) Identify the above diagram.(ii) Label the guidelines 1-3.(iii) Name the phenomenon which takes place in the above diagram.(iv) Define the phenomenon.(v) What is the importance of the above phenomenon?
Answer» (i) Chloroplast. (ii) 1. Granum 2. Stroma. 3. Thylakoids. (iii) Photosynthesis. (iv) Photosynthesis is the process by which living plant cells, containing chlorophyll, produce food substances (glucose and starch), from carbon dioxide and water, by using light energy. Plants release oxygen as a waste product during photosynthesis. (v) Photosynthesis is the source of energy food and oxygen.

196.

(i) Identify the above diagram.(ii) Label the guidelines 1-3.(iii) Name the phenomenon which takes place in the above diagram.(iv) Define the phenomenon.(v) What is the importance of the above phenomenon?

Answer»

(i) Chloroplast.

(ii) 1. Granum

2. Stroma.

3. Thylakoids.

(iii) Photosynthesis.

(iv) Photosynthesis is the process by which living plant cells, containing chlorophyll, produce food substances (glucose and starch), from carbon dioxide and water, by using light energy. Plants release oxygen as a waste product during photosynthesis.

(v) Photosynthesis is the source of energy food and oxygen.

Discussion

197.	Chromatophores take part inA. PhotosynthesisB. GrowthC. MovementsD. Respiration.
Answer» Correct Answer - A

Discussion

198.	The figure given below represents an experiment to demonstrate a particular aspect of photosynthesis. The alphabet ‘A’ represents a certain condition inside the flask.(i) What is the aim of the experiment ?(ii) Identify the special condition inside the flask.(iii) Name an alternative chemical that can be used instead of KOH.(iv) In what manner do the leaves 1 and 2 differ at the end of the starch test ?
Answer» (i) To prove that CO₂ is necessary for photosynthesis. (ii) No CO₂ in the flask. (iii) CaO (limestone), potassium pyrogallate. (iv) Leaf 1, no change in colour with starch list. Leaf 2, will turn blue black at the end of starch test.

198.

The figure given below represents an experiment to demonstrate a particular aspect of photosynthesis. The alphabet ‘A’ represents a certain condition inside the flask.(i) What is the aim of the experiment ?(ii) Identify the special condition inside the flask.(iii) Name an alternative chemical that can be used instead of KOH.(iv) In what manner do the leaves 1 and 2 differ at the end of the starch test ?

Answer»

(i) To prove that CO₂ is necessary for photosynthesis.

(ii) No CO₂ in the flask.

(iii) CaO (limestone), potassium pyrogallate.

(iv) Leaf 1, no change in colour with starch list.

Leaf 2, will turn blue black at the end of starch test.

Discussion

199.	Number of cell organells involved in photorespiration isA. OneB. TwoC. ThreeD. Four.
Answer» Correct Answer - C

Discussion

200.	The co-oprative photosynthesis is found inA. `C_(4)`-plantsB. `C_(3)`-plantsC. `C_(2)`-plantsD. Succulents.
Answer» Correct Answer - A

Discussion

Explore topic-wise InterviewSolutions in .

Why green leaves are thin and broad ?

Leaves are green because theyA. Absorb green lightB. Do not absorb but reflect green lightC. Utilise green lightD. Absorb and reflect green light.

Cyclic photosphorylation results in the formation ofA. `NADPH + H^(+)`B. `ATP` and `NADPH + H^(+)`C. `ADP`D. `ATP`

cyclic photosphorylation is carried out byA. `PS` I onlyB. `PS` II onlyC. Both A and BD. Photolysis and `PS` II.

Cyclic photosphorylation producesA. `NADPH`B. `ATP` and `NADPH`C. `ATP, NADPH` and `O_(2)`D. `ATP` only.

Which of the following factors is not limiting? (A) CO concentration (B) Light intensity (C) Temperature (D) Oxygen

Why photosynthesis is known as redox reaction?

Give reason. Why photosynthesis is a redox reaction?

Assimilatory power isA. `NADPH_(2)`B. `ATP`C. `ATP` and `NADPH_(2)`D. `FADH_(2)`.

PS-I hasA. More chlorophylla and more accessory pigmentsB. More chlorophylls and less accessory pigmentsC. Less chlorophylls and more accessory pigmentsD. Less chlorophylls and less accessory photosynthetic pigments.

Plants living in hot humid environment areA. `C_(3)` plantsB. `CAM` plantsC. `C_(4)` plantsD. All the above.

Which plant shows chloroplast dimorphismA. WheatB. RiceC. Sugar BeetD. Sugarcane/`C_(4)` plant.

Cytochromes areA. `O_(2)` acceptorsB. `H_(2)` acceptorsC. Electron acceptorsD. `H_(2)O` acceptors.

Rate of phosynthesis is higher inA. Very high lightB. Red lightC. Green lightD. Continuous light.

All types of plastids possess essentialy the same structure because theyA. Perform the same functionB. Store food material like starch, fat and proteinC. Occucr in aerial partsD. Can transform from one form to another.

Bacterial photosynthesis involves………A. PS IB. PS IIC. Both PS I and PS IID. None of them.

Chlorophyll a occurs inA. All photosunthetic autotrophsB. In all higher plantsC. All oxygen liberating autotrophsD. All plants except fungi.

`ATP` isA. Adenine triphosphateB. Adenosine tetraphosphateC. Adenosine triphosphateD. Asdenine tetraphosphate.

Bacterial photosynthesis differs from that of higher plants inA. Not liberating oxygenB. Non-requirement of lightC. Non-fixation of energyD. Requirement of host organism.

Water releases protons. Twelve water molecules will realeaseA. `24 H^(+)`B. `48 H^(+)`C. `12 H^(+)`D. `6 H^(+)`

`C_(4)` and `C_(3)` pathways of `CAM` plants are separated byA. Bundle sheathB. Mesophyll and bundle sheath cellsC. Mesophyll and bundle sheath chloroplastsD. Time.

Select correct statement for photosynthesis – (a) CO and H2O are oxidized (b) CO2 and are H2O reduced (c) H2O is reduced and CO2 oxidized (d) H2O is oxidized and CO2 reduced

In PS-I and PS-II the reaction centers respectively are(a) P700 and P800(b) P600 and P700(c) P800 and P700(d) P700 and P680

Photolysis of water necessarily requires – (a) Mn (b) Mg (c) Zn (d) Fe

PS-II is related to – (a) Photolysis of water(b) Reduction of CO2(c) Flowering (d) All the above

Which metal element is found in the center of the chlorophyll molecule? (a) Fe (b) Mg (c) Ne (d) Cu

The core metal of chlorophyll is Or Which element is left when chlorophyll is burntA. `Cu`B. `Mg`C. `Fe`D. `Ni`.

`RuBisCO` content of chloroplast isA. `20 %`B. `5 %`C. `11 %`D. `16 %`.

The photosynthetic lamellae taken out from a chloroplast and suspended in a nutrient medium in the presence of CO2 and light. Will they synthesize sugar or not?

What is meant by destarched plant ? How can it be destarched?

Solarisation isA. Formation of chlorophyllB. Destruction of chlorophyllC. Utilisation of sunlightD. Effect of solar light.

Summarise the photosynthetic reaction.

During monsoon, the rice crop of eastern states of India shows lesser yield due to limiting factor ofA. `CO_(2)`B. LightC. TemperatureD. Water.

A leaf is a food factory. Explain.

Explain the term Photosynthetic Membrane.

What does ATP abbreviated for?

What does NADP stand for ?

Define Phosphorylation.

The part of the chloroplast where the dark reaction of photosynthesis takes place.

Explain the term NADP.

Ratio between 2-carbon and 3-carbon intermediate having `NH_(2)` group formed in photosynthetic oxidation cycle isA. `2 : 1`B. `1 : 1`C. `3 : 2`D. `3 : 4`

Define Carbon cycle.

The process by which plants produce their food.

the site for light reaction isA. GranaB. StromaC. ERD. Cytoplasm.

(i) Identify the above diagram.(ii) Label the guidelines 1-3.(iii) Name the phenomenon which takes place in the above diagram.(iv) Define the phenomenon.(v) What is the importance of the above phenomenon?

Chromatophores take part inA. PhotosynthesisB. GrowthC. MovementsD. Respiration.

Number of cell organells involved in photorespiration isA. OneB. TwoC. ThreeD. Four.

The co-oprative photosynthesis is found inA. `C_(4)`-plantsB. `C_(3)`-plantsC. `C_(2)`-plantsD. Succulents.