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Neet Botany Photosynthesis Mcq
Quiz 12
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Q.1
In Calvin cycle,
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a) fructose 1,6 diphophate undergoes dephosphorylation.
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b) ATP is formed during dephosphoylation of fructose
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c) 1,3 di PGA undergo phosphorylation
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d) none of these
Explanation
Answer:(a)
Q.2
In C4 plants, carboxylation is twice, it can be represented as
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a) Pyruvic acid + CO2 and malic acid + CO2
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b) RuBP + CO2 and pyruvic acid + CO2
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c) PEPA + CO2 and RuBP + CO2
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d) PEPA + CO2 and malic acid + CO2
Explanation
Answer:(c)
Q.3
The two enzymes responsible for primary carboxylation in C3 and C4 pathway, respectively are
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a) RuBP carboxylase and RuBP oxygenase
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b) PEP carboxylase and RuBP carboxylase
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c) RuBP carboxylase and PEP carboxylase
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d) PEP carboxylase and pyruvate carboxylase
Explanation
Answer:(c)
Q.4
Erythrose monophosphate (4C) is formed during
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a) CAM pathway
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b) C4 pathway
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c) Conversion of fructose to glucose
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d) Regeneration of RuBP
Explanation
Answer:(d)
Q.5
____ ions help in photolysis of water.
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a) Mn++
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b) Mg++
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c) Cl-
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d) both (a) and (c)
Explanation
Answer:(c)
Q.6
Solarisation refers to ______.
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a) formation of sugar with help of water and energy
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b) destruction of chlorophyll
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c) synthesis of chl.
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d) both b and c
Explanation
Answer:(b)
Q.7
Photo-oxidation of chlorophyll and cell contents as a result of high light intensity is known as
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a) Solarization
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b) Photolysis
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c) Photperiodism
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d) Photorespiration
Explanation
Answer:(a)
Q.8
Ribbon shaped chloroplast is present in
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a) Zygnema
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b) Spirogyra
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c) Chlorobium
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d) Chromatinum
Explanation
Answer:(b)
Q.9
The head and tail of chlorophyll are made up of
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a) Pyrrole and tetrapyrrole
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b) Porphyrine and phyrin
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c) Pophyrine and phytol
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d) Tetrapyrrole and magnesium
Explanation
Answer:(c)
Q.10
Who is that scientist who gave the Law of limiting factors ?
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a) Blackman
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b) Hill
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c) Liebig
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d) Von Mohi
Explanation
Answer:(a)
Q.11
One of the following is electron donor to P680 during light reactions of photosynthesis.
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a) NADPH
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b) Phytochrome
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c) Chiorophyll
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d) Water
Explanation
Answer:(d)
Q.12
The fixation and reduction of CO2 occur in preence of
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a) ATP
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b) ATP and NADPH
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c) NADPH, chlorophyll and water
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d) ATP, NADPH and light
Explanation
Answer:(b)
Q.13
Light reaction of photosynthesis results in formation of ______.
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a) O2
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b) NADPH + H+
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c) ATP
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d) All of these
Explanation
Answer:(d)
Q.14
Which of the following connect the primary and secondary processes of photosynthesis?
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a) NADPH2
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b) ATP and NADPH2
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c) ATP
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d) Ferridoxins
Explanation
Answer:(b)
Q.15
In C3 pathway, out of 12 molecules of 3-PGAL, how many are used for regeneration of RuBP?
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a) 12
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b) 8
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c) 10
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d) 6
Explanation
Answer:(c)
Q.16
The source of CO2 during calvin cycle in C4 plant is
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a) Malic acid
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b) OAA
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c) PEP
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d) RuBP
Explanation
Answer:(a)
Q.17
The enzyme pair common to C3 plants and EMP is
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a) cytochrome oxidase and enolase
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b) aldolase and triose phosphate isomerase
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c) aldolase and enolase
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d) phosphoglyceromutase and triose phosphate isomerase
Explanation
Answer:(b)
Q.18
The chemical structure of chlorophyll ‘a’ varies from chlorophyll ‘b’ due to difference between.
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a) CH3 and C2H5
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b) CH3 and CH2 = CH2
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c) CH3 and CHO
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d) CHO and CH2 = CH2
Explanation
Answer:(c)
Q.19
Choose the correct statement.
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a) The C4 plants do not have Rubisco.
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b) Carboxylation of RuBP leads to the formation of PGA and phosphoglycolate.
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c) Decarboxylation of C4 acids occurs in the mesophyll cells.
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d) In CAM plants Calvin’s cycle reactions occur during night.
Explanation
Answer:(c)
Q.20
Quinones are
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a) mobile electron carriers
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b) enzymes of oxidative phosphorylation
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c) enzymes of krebs cycle
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d) none of the above
Explanation
Answer:(a)
Q.21
One photon is blue light contains....kcal and of red light....kcal
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a) 70 ; 40
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b) 220 ; 70
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c) 10 ; 90
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d) 90 ; 10
Explanation
Answer:(d)
Q.22
The inhibiting effect of oxygen in C3 plants on photosynthesis is
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a) solarization
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b) photooxidation
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c) Warbug’s effect
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d) none above
Explanation
Answer:(c)
Q.23
A. Six turns of Calvin-cycle result in the production of one molecule of glucose (C6H12O6) R. Three molecules of ribulose 1, 5 – bisphosphate (Ru BP) react with three molecules of carbon dioxide to produce six carbon intermediates.
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a) A is correct and R is its explanation
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b) A is correct but R is not its explanation
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c) A is correct but R is wrong
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d) Both A and R are wrong
Explanation
Answer:(c)
Q.24
Photosynthesis in C4 plants is relatively less limited by atmospheric CO2 levels because :
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a) Four carbon acids are the primary initial CO2 fixation production.
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b) The primary fixation of CO2 is mediated via PEP carboxalase.
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c) Effective pumping of CO2 into bundlesheath cells.
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d) Rubisco in C4 plants has higher affinity for CO2.
Explanation
Answer:(b)
Q.25
A. Photosynthestically C4 plants are less efficient then C3 plants. R. The operaion of C4 pathway requires the involvement of only bundle-sheath cells.
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a) If Assertion (A) and reason (R) both are correct and R is explanation to A.
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b) If (A) and (R) both are correct but (R) is not an explanation to A.
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c) If A is true but R is false.
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d) If both A and R are false.
Explanation
Answer:(d)
Q.26
In C4 plants, the primary CO2 acceptor is
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a) 3 - PGA
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b) Oxalo acetic acid
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c) RuBP
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d) PEP
Explanation
Answer:(d)
Q.27
Which of the following plant is efficient converter of solar energy whose net productivity 2-4 kg/m2/yr or even higher.
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a) Wheat
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b) rice
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c) sugarcane
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d) bajra
Explanation
Answer:(c)
Q.28
Chlorophyll a is absent in which of the following photosynthesising organisms ?
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a) Bacteria
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b) Cyanobacteria
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c) Red algae
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d) Brown algae
Explanation
Answer:(a)
Q.29
For the process of photosynthesis all except one of the following items are essential. Point out the exception
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a) CO2, optimum temperature
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b) Glucose and oxygen
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c) Water and minerals
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d) Light and chlorophyll
Explanation
Answer:(b)
Q.30
Which of the following pigments contains open pyrolle ring?
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a) Phycobilins
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b) Xanthophylls
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c) Chlorophylls
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d) α-carotene
Explanation
Answer:(a)
0 h : 0 m : 1 s
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