PHOTOSYNTHESIS IN HIGHER PLANTS Q BANK

PHOTOSYNTHESIS IN HIGHER PLANTS Q BANK Question and answer based on strictly latest NCERT based pattern, and previous year NEET (AIPMT) question. chapter wise approach mcq is more useful for quick revision and increase speed for maintaining time period.

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MCQ:-



Q1) Phosphoenol Pyruvate (PEP) is the primary CO₂ acceptor in  (NEET 2017)

C₃-plants
C₄-plants
C₂-plants
C₃ & C₄-plants

Answer- C₄-plants
Q2) With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct?  (NEET 2017)

Light saturation for CO₂-fixation occurs at 10% of full sunlight
Increasing atmospheric CO₂-fixation concentration upto 0.05% can enhance CO₂-fixation rate
C₃-plants respond to higher temperature with enhanced photosynthesis, while C₄-plants have much lower temperature optimum
Tomato is a greenhouse crop, which can be grown in CO₂ enriched atmosphere for higher yield

Answer- C₃-plants respond to higher temperature with enhanced photosynthesis, while C₄-plants have much lower temperature optimum
Q3) A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rates of photosynthesis at high temperatures & has improved efficiency of nitrogen utilisation, In which of the following physiological groups would you assign this plant?   (NEET 2016, PHASE I)

C₄
CAM
Nitrogen fixer
C₃

Answer- C₄
Q4) Emerson’s enhancement effect & red drop have been instrumental in the discovery of  (NEET 2016, PHASE I)

Two photosystems operating simultaneously
Photophosphorylation & cyclic electron transport
Oxidative phosphorylation
Photophosphorylation & non-cyclic electron transport

Answer- Two photosystems operating simultaneously
Q5) In a chloroplast the highest number of protons are found in  (NEET 2016, PHASE I)

Lumen of thylakoids
Inter membrane space
Antennae complex
Stroma

Answer- Lumen of thylakoids
Q6) The oxygen evolved during photosynthesis comes from water molecules. Which one of the following pairs of elements involved in this reaction?    (NEET 2016, PHASE I)

Manganese & chlorine
Manganese & potassium
Magnesium & molybdenum
Magnesium & chlorine

Answer- Manganese & chlorine
Q7) The process which makes major difference between C₃ & C₄-plants is   (NEET 2016, PHASE II)

Glycolysis
Calvin cycle
Photorespiration
Respiration

Answer- Photorespiration
Q8) In photosynthesis, the light-independent reactions take place at  (CBSE AIPMT 2015)

Thylakoid lumen
Photosystem-I
Photosystem-II
Stromal matrix

Answer- Stromal matrix
Q9) Anoxygenic photosynthesis is characteristic of   (CBSE AIPMT 2014)

Rhodospirillum
Spirogyra
Chlamydomonas
Ulva

Answer- Rhodospirillum
Q10) A process that makes important difference between C₃ & C₄-plants is  (CBSE AIPMT 2012)

Transpiration
Glycolysis
Photosynthesis
Photorespiration

Answer- Photorespiration
Q11) The correct sequence of cell organelles during photorespiration is  (CBSE AIPMT 2012)

Chloroplast- Golgi bodies-Mitochondria
Chloroplast- Rough endoplasmic reticulum- Dictyosomes
Chloroplast- Mitochondria- Peroxisome
Chloroplast- Vacuole- Peroxisome

Answer- Chloroplast- Mitochondria- Peroxisome
Q12) CAM helps the plant in   (CBSE AIPMT 2011)

Secondary growth
Disease resistance
Reproduction
Conserving water

Answer- Conserving water
Q13) Of the total incident solar radiation the proportion of PAR is   (CBSE AIPMT 2011)

About 60%
Less than 50%
More than 80%
About 70%

Answer- Less than 50%
Q14) PGA as the first CO₂-fixation product was discovered in photosynthesis of  (CBSE AIPMT 2010)

Bryophyte
Gymnosperm
Angiosperm
Alga

Answer- Alga
Q15) C₄-plants are more efficient in photosynthesis than C₃-plants due to  (CBSE AIPMT 2010, 08)

Higher leaf area
Presence of large number of chloroplasts in the leaf cells
Presence of thin cuticle
Lower rate of photorespiration

Answer- Presence of large number of chloroplasts in the leaf cells
Q16) Stroma in the chloroplasts of higher plants contains  (CBSE AIPMT 2009)

Light-independent reaction enzymes
Light-dependent reaction enzymes
Ribosomes
Chlorophyll

Answer- Light-independent reaction enzymes
Q17) Oxygenic photosynthesis occurs in (CBSE AIPMT 2009)

Chromatium
Oscillatoria
Rhodospirillum
Chlorobium

Answer- Oscillatoria
Q18) Cyclic-photophosphorylation results in the formation of  (CBSE AIPMT 2009)

NADPH
ATP & NADPH
ATP, NADPH & O₂
ATP

Answer- ATP

Q19) Carbohydrates are commonly found as starch in plant storage organs. Which of the following five properties of starch (A-E) make it useful as a storage material?
Easily translocated
Chemically non-reactive
Easily digested by animals
Osmotically inactive
Synthesised during photosynthesis
The useful properties are             (CBSE AIPMT 2008)

B&C
B&D
A, C & E
A&E

Answer- A, C & E


Q20) In the leaves of  C₄-plants, malic acid formation during CO₂-fixation occurs in the cells of  (CBSE,AIPMT 2007,08)

Mesophyll
Bundle sheath
Phloem
Epidermis

Answer- Mesophyll
Q21) The first acceptor of electrons from an excited chlorophyll molecule of photosystem-II is (CBSE AIPMT 2007,08)

Cytochrome
Iron-sulphur protein
Ferredoxin
Quinone

Answer- Quinone

Q22) In photosystem-I the first electron acceptor is (CBSE AIPMT 2006)

Cytochrome
Plastocyanin
An iron-sulphur protein
Ferredoxin

Answer- An iron-sulphur protein
Q23) During photorespiration, the oxygen consuming reaction(s) occur in (CBSE AIPMT 2006)

Stroma of chloroplasts & peroxisomes
Grana of chloroplasts & peroxisomes
Stroma of chloroplasts
Stroma of chloroplasts & mitochondria

Answer- Stroma of chloroplasts & peroxisomes

Q24) Aa compared to a C₃-plant, how many additional molecules of ATP are needed for net production of one molecule of hexose sugar by C₄plants (CBSE AIPMT 2005)

2
6
12
Zero

Answer- 12
Q25) Photosythesis in C₄-plants is relatively less limited by atmospheric CO₂ levels because  (CBSE AIPMT 2005)

Effective pumping of CO₂ into bundle sheath cells
RuBisCO in C₄-plants has higher affinity for CO₂
Four carbon acids are the primary initial CO₂-fixation products
The primary fixation of CO₂ is mediated via PEP carboxylase

Answer- The primary fixation of CO₂ is mediated via PEP carboxylase
Q26) In C₃-plants, the first stable product of photosynthesis during the dark reaction is   (CBSE AIPMT 2004)

Malic acid
Oxaloacetic acid
3-phosphoglyceric acid
Phosphoglyceraldehyde

Answer- 3-phosphoglyceric acid
Q27) Plants adapted to low light intensity have  (CBSE AIPMT 2004)

Larger photosynthetic unit size than the sun plants
Higher rate of CO₂ fixation than the sun plants
More extended root system
Leaves modified to spines

Answer- Larger photosynthetic unit size than the sun plants


Q28) Chlorophyll in chloroplasts is located in  (CBSE AIPMT 2004)

Outer membrane
Inner membrane
Thylakoids
Stroma

Answer- Thylakoids

Q29) Which fractions of the visible spectrum of solar radiations are primarily absorbed by carotenoids of the higher plants?  (CBSE AIPMT 2003)

Violet & blue
Blue & green
Green & red
Red & violet

Answer- Violet & blue

Q30) In sugarcane plant ¹⁴CO₂ is fixed in malic acid, in which the enzyme that fixes CO₂ is   (CBSE AIPMT 2003)

Fructose phosphatase
Ribulose biphosphate carboxylase
Phosphoenol pyruvic acid carboxylase
Ribulose phosphate kinase

Answer- Phosphoenol pyruvic acid carboxylase
Q31) Which one of the following is wrong in relation to photorespiration?   (CBSE AIPMT 2003)

It is a characteristic of C₃-plants
It occurs in chloroplasts
It occurs in  day time only
It is a characteristic of C₄-plants

Answer- It is a characteristic of C₄-plants
Q32) Which element is located at the centre of the porphyrin ring in chlorophyll?   (CBSE AIPMT 2003)

Manganese
Calcium
Magnesium
Potassium

Answer- Magnesium

Q33) Whch of the following absorb light energy for photosynthesis?  (CBSE AIPMT 2002)

Chlorophyll
Water molecule
O₂
RuBP

Answer- Chlorophyll


Q34) In photosynthesis energy from light reaction to dark reaction is transferred in the form of   (CBSE AIPMT 2002)

ADP
ATP
RuDP
Chlorophyll

Answer- ATP


Q35) Which pigment system is inactivated in red drop?    (CBSE AIPMT 2001)

PS-I & PS-II
PS-I
PS-II
None of the above

Answer- PS-II

Q36) Which pair is wrong?   (CBSE AIPMT 2001)

C₃-Maize
C₄-Kranz anatomy
Calvin cycle- PGA
Hatch & Slack pathway- Oxalo acetic acid

Answer- C₃-Maize
Q37) How many turns of Calvin cycle yield one molecule of glucose?  (CBSE AIPMT 2000)

8
2
6
4

Answer- 6


Q38) The first step of photosynthesis is  (CBSE AIPMT 2000)

Excitation of electron of chlorophyll by a photon of light
Formation of ATP
Attachment of CO₂ to 5 carbon sugar
Ionisation of water



Answer- Excitation of electron of chlorophyll by a photon of light

Q39) Fixation of one CO₂ molecule through Calvin cycle requires  (CBSE AIPMT 2000)

1 ATP & 2 NADPH₂
2 ATP & 2 NADPH₂
3 ATP & 2 NADPH₂
2 ATP & 1 NADPH₂

Answer- 3 ATP & 2 NADPH₂


Q40) Photochemical reactions in the chloroplast are directly involved in (CBSE AIPMT 2000)

Formation of phosphoglyceric acid
Fixation of carbon dioxide
Synthesis of glucose & starch
Photolysis of water & phosphorylation of ADP to ATP

Answer Photolysis of water & phosphorylation of ADP to ATP


Q41) Which enzyme is most abundantly found on earth? (CBSE AIPMT 1999)

Catalase
RuBisCO
Nitrogenase
Invertase

Answer- RuBisCO
Q42) Protochlorophyll differs from chlorophyll in lacking (CBSE AIPMT 1998)

2 hydrogen atoms in one of its pyrrole rings
2 hydrogen atoms in two of its pyrrole rings
4 hydrogen atoms in one of its pyrrole rings
4 hydrogen atoms in two of its pyrrole rings

Answer- 2 hydrogen atoms in one of its pyrrole rings
Q43) NADPH is generated through   (CBSE AIPMT 1997)

Photosystem-I
Photosystem-II
Anaerobic respiration
Glycolysis

Answer- Photosystem-II
Q44) The principle of limiting factors was proposed by   (CBSE AIPMT 1996)

Blackmann
Hill
Amon
Liebig

Answer- Blackmann
Q45) Which one of the following is represented by Calvin cycle? (CBSE AIPMT 1996)

Reductive carboxylation
Oxidative carboxylation
Photophosphorylation
Oxidative phosphorylation


Answer-  Reductive carboxylation
Q46) Photorespiration is favoured by   (CBSE AIPMT 1996)

High O₂ & low CO₂
Low light & high O₂
Low temperature & high O₂
Low O₂ & high CO₂

Answer- High O₂ & low CO₂
Q47) Chlorophyll-a molecule at its carbon atom 3 of the pyrrole ring-II has one of the following  (CBSE AIPMT 1996)

Aldehyde group
Methyl group
Carboxyl group
Magnesium

Answer- Aldehyde group


Q48) Photosynthetically active radiation is represented by the range of wavelength   (CBSE AIPMT 1996,2004,05)

340-450nm
400-700nm
500-600nm
400-950nm

Answer- 400-700nm
Q49) Pigment acting as a reaction centre during photosynthesis is   (CBSE AIPMT 1994)

Carotene
Phytochrome
P₇₀₀
Cytochrome

Answer- P₇₀₀
Q50) C₄-cycle was discovered by   (CBSE AIPMT 1994)

Hatch & Slack
Calvin
Hill
Amon

Answer- Hatch & Slack