Saturday, March 17, 2012

PHOTOSYNTHESIS LIGHT PHASE ASSIGNMENT

1 [A]: Carotenoids are made of non-mineral essential elements
[R]: Carotenes have C, H and O





Ans:A is true but R is false
2 The following pigment is a hydrocarbon.
I. Lycopene
II. Lutein
III. Zeaxanthin
IV. β-carotene





Ans:I and IV
3 Water soluble photosynthetic pigments are seen in




Ans:Blue-green algae ; Red algae
4 [A]: Carotenoids are accessory pigments.
[R]: Lycopene protects the chlorophyll from photo-oxidation





Ans:Both A and R are true but R is not the correct explanation of A
5 Light Harvesting complex has




Ans:All types of photosynthetic pigments
6 Light energy is converted into chemical energy by




Ans:P 700
7 In photosynthesis the light energy is utilized in the form of




Ans:Red light
8 If a LHC absorbs 2000 photons, the minimum number of photons involved in exciting the reaction centre would be




Ans:1900
9 The presence of two phases (Light reaction and Dark reaction) in the mechanism of photosynthesis was first reported by




Ans:Blackman
10 Match the following





Ans:A - V, B - IV, C - I, D - II
11 Study the following table and choose the correct combination





Ans:I and IV
12 [A]: NADP has ADP
[R]: It has Purine nucleotide





Ans:A is false but R is true
13 Potassium ferric oxalate is used to demonstrate




Ans:Hill reaction
14 In Z scheme Hill and Bendall did not show




Ans:Translocation of Protons
15 [A]: DCMU inhibits non-cyclic electron transport
[R]: It prevents the binding of PQ to cytochrome b/f complex





Ans:A is true but R is false
16 Number of photons required for the formation of one NADPH during non-cyclic electron transport is




Ans:4
17 Choose the incorrect statements
I. P680+ is a strong oxidant
II. P700+is a strong oxidant
III. Energy is lost as heat during the transport of e- from P680 to Pheo
IV. The electron that reduces the PC has less energy than the electron that reduces cytochrome b/f complex.





Ans:All except II
18 Arrange the following in a sequence of gradual increase in the amount of energy that they carry.
I. P680+
II. PC
III. PQH2
IV. P 700





Ans:IV, II, III, I
19 The number of photons pumped into lumen from stroma due to oxidation of 12 molecules of water during Z scheme is




Ans:48
20 Arrange the following electron carriers in correct sequence of their participation in non-cyclic electron transport.
I. PC
II. Pheo
III. Fd
IV. PQ





Ans:II, IV, I, III
21 Study the following table and choose the correct combination





Ans:I and III
22 [A]: P680 is a chlorophyll a molecule with absorption maxima at 680nm
[R]: P680 can not absorb blue light





Ans:A is true but R is false
23 The following pigment molecule can not transfer the light energy to other pigment pmolecule




Ans:P700
24 During photosynthesis, the light energy is first converted into




Ans:Excitation energy
25 Identify the pigment molecule which has relatively at higher energy level




Ans:Chl* formed due to absorption of blue photon
26 [A]: Reaction centre is devoid of chlorophyll b
[R]: The photons absorbed by chlorophyll b can not be transferred to reaction centre





Ans:A is true but R is false
27 The photons absorbed by antenna pigment molecules is transferred to reaction centre by a phenomenon known as




Ans:Resonance transfer
28 [A]: Photosynthetic rate is more in blue light than red light
[R]: Blue light has lesser wavelength than red light.





Ans:A is false but R is true
29 Match the following





Ans:A - III, B - IV, C - II, D - I
30 [A]: Oxygen is not evolved in bacterial photosynthesis
[R]: CO2 is not fixed by photosynthetic bacteria





Ans:A is true but R is false
31 Most of the global photosynthesis is carried out by




Ans:Algae
32 During photosynthesis Oxygen is evolved in




Ans:Lumen
33 The chemical formula for Chlorophyll b is




Ans:C55H70O6N4Mg
34 Methyl group of Chlorophyll b is attached to




Ans:II pyrrole group
35 The number of carbon atoms in Phytol tail is




Ans:20
36 Chlorophyll b is




Ans:Olive green
37 Phytol tail of chlorophyll is attached to




Ans:IV pyrrole group
38 Match the following





Ans:A - I, B - IV, C - III, D - II
39 [A]: Bacteria do not evolve Oxygen in their photosynthesis
[R]: They lack Chlorophylls





Ans:A is true but R is false
40 Phytol tail of chlorophyll is esterified to the following pyrrole group of head




Ans:IV

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Asthra