ANSWER SHEET FOR LIGHT REACTION PIGMENT
1.Correct Answer: D
Solution:
Chlorophyll has a
tetrapyrrole porphyrin head
(15×15Ao)
and a long chain alcohol
called phytol
(20Ao)
2.Correct Answer: D
3.Correct Answer: A
4.Correct Answer: C
5.Correct
Answer: C
6.Correct
Answer: A
7.Correct
Answer: C
8.Correct
Answer: A
Solution:
The
chloroplast pigment is fat soluble and are located in the lipid part of the
thylakoid membranes.
9.Correct
Answer: B
10.Correct Answer: D
Solution:
Xanthophylls are yellow
coloured carotenoid also called xanthols or carotenols.
11.Correct
Answer: A
12.Correct Answer: C
Solution:
Wavelength occur in red
part of the spectrum is 650-760 nm.
13.Correct
Answer: B
14.Correct Answer: B
Solution:
The
β−
carotene on hydrolysis
gives vitamin A, hence the carotenes are also called provitamin A.
β−
carotene is black yellow
pigment of carrot roots.
15.Correct
Answer: A
16.Correct
Answer: B
17.Correct
Answer: A
18.Correct
Answer: B
19.Correct
Answer: A
20.Correct
Answer: A
21.Correct Answer: B
Solution:
Quantum requirement in
photosynthesis = 8, i.e., 8 quanta of light are required to evolve one mol. of
O2
. Hence
quantum yield = 1/8 = 0.125 (i.e., a fraction of 1) as 12%.
22.Correct Answer: D
Solution:
Clayton
(1966) discovered another form of chlorophyll a which has absorption maximum at
700 nm. This chlorophyll is called P-700.
23.Correct
Answer: B
24.Correct
Answer: C
25.Correct
Answer: B
26.Correct
Answer: B
27.Correct Answer: B
Solution:
Photosystem
II is a photosynthetic pigment system along with some electron carriers that is
located in the appressed part of the grana thylakoids.
28.Correct
Answer: C
29.Correct
Answer: D
30.Correct
Answer: B
31.Correct
Answer: A
32.Correct Answer: A
Solution:
In cyclic
photophosphorylation per turn, 2 ATP molecules are produced.
33.Correct Answer: B
Solution:
Non-cyclic
photophosphorylation involved both PS-I and PS-II. Flow of electrons is
unidirectional. Here electrons are not cycled back and are used in the
reduction of
NADP
to
NADPH2
34.Correct
Answer: A
35.Correct Answer: D
Solution:
Fucoxanthin
is another important xanthophyll present in phaeophyceae (Brown algae).
36.Correct
Answer: D
37.Correct Answer: A
Solution:
A
chlorophyll molecule has a tadpole like structure with a porphyrin head and
phytol tail. The porphyrin head is made up of four pyrrole rings, which are
linked by methine (-CH =) groups forming a ring system.
38.Correct Answer: C
Solution:
The colours of leaves is
modified in certain plants due to the presence of purple pigment called
anthocyanins. Anthocyanins are soluble in water; hence they occur in solution
in the water of the cells.
39.Correct
Answer: C
40.Correct
Answer: C
41.Correct Answer: A
Solution:
Chlorophyll
a is widely distributed in green algae and higher plants.
42.Correct
Answer: A
43.Correct
Answer: A
44.Correct
Answer: C
45.Correct
Answer: A
46.Correct Answer: B
Solution:
It is the
first stage of photosynthesis which consists of light driven splitting of water
or photolysis. Photolysis requires light energy.
47.Correct
Answer: C
48.Correct
Answer: D
49.Correct Answer: C
Solution:
ATP and NADPH2 produced in
this light reaction and liberation of oxygen requires
Cl
and
Ca2+
50.Correct Answer: B
Solution:
Core metal of chlorophyll
is Mg. When central Mg is replaced by Fe, the chlorophyll becomes a green
pigment called "cytochrome" which is used in photosynthesis.
51.Correct
Answer: B
52.Correct
Answer: A
53.Correct Answer: D
Solution:
Chlorophyll has a
tetrapyrrole porphyrin head
(15 × 15Ao)
and a long chain alcohol
called phytol
(20Ao)
54.Correct
Answer: C
55.Correct Answer: A
56.Correct Answer: A
Solution:
Chlorophyll
soluble in organic solvents like alcohol, acetone etc.
57.Correct Answer: A
Solution:
Phycobilin’s
pigments are water soluble. Phycobilins are accessory pigments i.e., they
absorb light and transfer it to chlorophyll.
58.Correct
Answer: B
59.Correct
Answer: C
60.Correct
Answer: C
61.Correct Answer: A
Solution:
The reaction centers of PS
I and PS II can be denoted as
P700+
and
P680+
respectively.
Positively charged reaction centers act as attractants for electrons.
62.Correct Answer: C
Solution:
During light reaction
energy from sun light is absorbed and converted to chemical energy which is
stored in
ATP
and
NADPH+H+.
63.Correct Answer: C
Solution:
The important pigments of
this system are chlorophyll a 670, chlorophyll a 683, chlorophyll a 695,
P700
Some
physiologist also includes carotenes and chlorophyll b in pigment system I.
P700 act as the reaction Centre.
64.Correct
Answer: C
65.Correct Answer: B
Solution:
Because
free ions of H+ and OH- are attached with Mn and chloride ions and make a
compound partially.
66.Correct Answer: B
Solution:
Because in the pigment
system-II, wavelength of light is shorter than
680mμ
67.Correct
Answer: B
68.Correct
Answer: B
69.Correct
Answer: B
70.Correct
Answer: B
71.Correct
Answer: B
72.Correct
Answer: B
73.Correct
Answer: B
74.Correct
Answer: C
75.Correct
Answer: D
76.Correct Answer: A
Solution:
The main compound
involved in the conversion of light energy in to chemical energy are the
photosynthetic pigments that exist in the chloroplast.
77.Correct
Answer: C
78.Correct
Answer: C
79.Correct Answer: C
Solution:
The
absorption spectrum of chlorophyll a and chlorophyll b indicate that these
pigments mainly absorb blue and red lights. Action spectrum shows that maximum
photosynthesis takes place in blue and red regions of spectrum.
80.Correct
Answer: C
81.Correct
Answer: C
82.Correct Answer: A
Solution:
Grana are
the sites for light reaction of photosynthesis and consist of photosynthetic
unit "quantosomes" Park and Biggins (1964) gave the term quantosome
for photosynthetic units is equivalent to 230 chlorophyll molecules.
83.Correct
Answer: B
84.Correct
Answer: B
85.Correct
Answer: C
86.Correct Answer: D
Solution:
In light
phase light energy is converted to chemical energy. This energy is stored in
ATP.
87.Correct
Answer: C
88.Correct
Answer: A
89.Correct
Answer: D
90.Correct Answer: A
Solution:
This
non-cyclic photophosphorylation is also known as Z-Scheme (because of shape of
path of electron - flow) and this was given by Hill and Bendall (1960).
91.Correct Answer: C
Solution:
Photolysis means
splitting of water molecules to release oxygen. This occurs in photosynthesis,
i.e., Photosystem-II.
92.Correct
Answer: D
93.Correct
Answer: A
94.Correct Answer: C
Solution:
Light energy brings about
changes in
Mn (Mn2+,
Mn3+, Mn4+)
which helps in removing
electrons from
OH−
component of water
forming oxygen.
95.Correct Answer: A
Solution:
Chlorophyll-a
is widely distributed in green plant and it is also called primary photosynthetic
pigment and universal photosynthetic pigment.
96.Correct Answer: A
Solution:
Cytochromes
are systems of electron-transferring proteins, with iron-porphyrin or
copper-porphyrin as prosthetic groups.
97.Correct Answer: C
Solution:
Phosphate is coupled with
ADP to produce ATP using light energy during photosynthesis.
98.Correct
Answer: C
99.Correct Answer: C
Solution:
Chl.-a 700 or
P700
is the
reaction Centre of PS-I.
100.Correct
Answer: D
101.Correct
Answer: C
102.Correct
Answer: A
103.Correct
Answer: B
104.Correct
Answer: C
105.Correct
Answer: D
106.Correct
Answer: C
107.Correct Answer: B
Solution:
The photosystem-II
(Reaction centre of P-680) extracts an
e−
from water returning to its
unexcited state. The removal of four e- from two molecules of water requires 4
quanta of light to fall on PS-II and leads to the production of
4H+
ions and one molecules
of
O2
108.Correct Answer: B
Solution:
During
light reaction not only reduced NADP is formed and O2 is evolved but ATP is
also formed. This formation of high energy phorphates (ATP) is dependent on
light hence called photophosphorylation.
109.Correct
Answer: D
110.Correct
Answer: D
111.Correct
Answer: B
112.Correct Answer: A
Solution:
Robert Hill (1939) first of
all showed that if chloroplasts extracted from leaves of stellaria media and
Lamium album are suspended in a test tube containing suitable electron acceptor
e.g., potassium ferrooxalate and potassium ferricyanide,
O2
is
released due to photochemical splitting of water.
113.Correct
Answer: C
114.Correct
Answer: D
115.Correct
Answer: C
116.Correct Answer: A
Solution:
Green plants and algae use
two types of photosystems, PS-I with chl.
P700
in its reaction Centre and
PS-II with
P680
in its reaction Centre. The
two photosystems are linked by a chain of electron carriers. Light
excites
P680
of PS-II to activated
P680
117.Correct Answer: D
Solution:
Temperature coefficient
(Q10)
value in photosynthesis is
found to be 2 when photosynthesis is fast but
Q10
is 1 when
photosynthesis is slow.
118.Correct
Answer: C
119.Correct
Answer: C
120.Correct
Answer: B
121.Correct
Answer: A
122.Correct
Answer: A
123.Correct
Answer: C
124.Correct
Answer: C
125.Correct
Answer: D
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