XI: Chapter 13- Photosynthesis Flashcards
1
Q
C₅₅H₇₂O₅N₄Mg is the molecular formula of
A
Chlorophyll a
2
Q
C55H74O6N4Mg is the molecular formula of
A
Chlorophyll b
3
Q
C35H32O5N4 is the molecular formula of
A
Chlorophyll c
4
Q
C54H70O6N4Mg is the molecular formula of
A
Chlorophyll d
5
Q
How many pyrrole rings are present in a chlorophyll molecule?
A
4
6
Q
What forms the head of chlorophyll molecule?
A
Porphyrin ring (tetrapyrrole structure)
7
Q
What forms the tail of chlorophyll molecule?
A
Phytol tail
8
Q
Phytol tail is absent in which chlorophyll?
A
Chlorophyll c
9
Q
Carotenol is the other name for
A
Xanthophyll
10
Q
Name the basic carotene.
A
Lycopene
11
Q
What makes tomato, rose, etc red?
A
Lycopene (carotene)
12
Q
What gives colour to the autumn foliage?
A
Leutin (xanthophyll)
13
Q
Where are carotenols found in animals?
A
Corpus luteum
14
Q
What happens to carotenes in animals?
A
It is converted into vitamin A
15
Q
What is the colour of allophycocyanin?
A
Green
16
Q
Which are the universal pigments found in plant kingdom?
A
Chlorophyll a, β-Carotene
17
Q
Which wavelength of light does photosystem I absorb the most?
A
700 nm
18
Q
Which wavelength of light does photosystem II absorb the most?
A
680 nm
19
Q
Which photosystem is light green in colour?
A
Photosystem I
20
Q
Which photosystem is dark green in colour?
A
PSII
21
Q
How many chlorophyll a molecules does PSI have?
A
200-400
22
Q
How many chlorophyll a molecules does PSII have?
A
200
23
Q
Where is PS I found?
A
Stroma lamellae and granum
24
Q
Where is PSII found?
A
Granum
25
Which photosystem is involved in both cyclic and noncyclic photophosphorylation?
PSI
26
What is the light harvesting complex made of in a photosystem?
Pigment molecules and proteins
27
What forms the antenna of the photosystem?
Light harvesting complex
28
What is present in the reaction centre of a photosystem?
Chlorophyll a
29
In which phase of photosynthesis are assimilatory powers generated?
Light reaction
30
Hill reaction in photosynthesis is also called
Light reaction
31
What occurs in the photophysical phase of light reaction?
Accessory pigments transfer light energy to chlorophyll a
| Chlorophyll a is activated by photons
32
What happens in the photochemical phase of light reactions?
Photolysis of water, production of assimilatory powers
33
How much energy does the electron liberated from photosystem by a photon contain?
23 kcal/mol
34
How many ATP and NADPH molecules are produced in cyclic photophosphorylation?
2 ATP and no NADPH
35
What is the effect of photosynthetic poisons on cyclic photophosphorylation?
No effect
36
What is the sequence of electron transport chain in cyclic photophosphorylation?
```
PSI
X
FeS
Fd
PQ
Cyt-b6
Cyt-f
PC
PSI
```
37
How many ATP and NADPH molecules are produced in non-cyclic photophosphorylation?
1 ATP, 1 NADPH
38
Which is the first electron donor in non cyclic photophosphorylation?
Water
39
What is the sequence of electron transport chain in non-cyclic photophosphorylation?
```
PSII
Phe
PQ
Cyt-b6
Cyt-f
PC
PSI
FeS
Fd
```
40
What is also called Blackman's reaction?
Dark reaction of photosynthesis
41
Which is the first stable product formed from combination of ribulose 1,5 bisphosphate with carbon dioxide?
3-phoshoglycerate
42
How many ATP and NADPH are utilized in calvin cycle?
3 ATP and 2 NADPH
43
Which algae were used by Calvin to formulate the calvin cycle?
Chlorella and Scendesmus
44
C3 cycle is found in which monocots?
Wheat and rice
45
What kind of inhibition is seen when oxygen reacts with RuBisCO instead of CO2?
Competitive inhibition
46
Which photosynthetic pathway is found in Euphorbia?
C4 cycle
47
In what manner are bundle sheath cell and mesophyll cells arranged in C4 plants?
Crown ring manner
48
In what form is oxaloacetic acid transfered from mesophyll cell to bundlesheath cell in C4 plants?
Malic acid
49
What is formed from the breakdown of malic acid in bundle sheath cell in C4 plants?
Pyruvic acid and CO2
50
In which type of plants is CAM pathway found?
Succulent xerophytes
51
Which type of photosynthetic pathway is found in pineapples?
CAM pathway
52
Which is the first stable product of CAM pathway?
Oxaloacetic acid
53
Where is malic acid stored during ngiht in CAM plants?
Vacuole
54
Which is the first CO2 acceptor in CAM plants?
Phosphoenol pyruvate
55
Which is the first stable product formed during photorespiration?
2-phosphoglycolate
56
During photorespiration, glycolate from mitochondria transfers to which organelle?
Peroxisomes
57
Glyoxylate forms which compound during photorespiration?
Glycine
58
How many nitrogen are lost for conversion of glycine to serine?
1
59
How many NADH are formed during the conversion of glycine to serine in photorespiration?
1
60
Blackman's law of limiting factors is a modification of
LIebeg's law of minimum
61
How is photosynthesis affected when CO2 concentration increase by 0.05%
Photosynthesis increases
62
In which light is photorespiration maximum?
Red light
63
How is photosynthesis affected when plant is subjected to intermittent light?
No photosynthesis occurs
64
What is the decreasing effect of high light intensity on photosynthesis called?
Solarisation
65
What is the decreasing effect of high concentration of oxygen on photosynthesis in C3 plants called?
Warburg's effect
66
What is the effect of high concentration of oxygen on C4 plants?
No effect
67
What is photosynthetic number?
The amount of CO2 absorbed in grams by 1 gram chlorophyll.
68
Where do the hydrogen ions accumulate according to the chemiosmotic hypothesis?
In the lumen of thylakoid
69
Who proved that green plants produce food using their leaves?
Stephen Hals
70
Who reported that plant purify air?
Priestley
71
Who reported that plants only produce food in the presence of light?
Jan ingenhouz
72
Who gave the concept of cardinal points?
Julius van Sachs
73
Who stated that the first stable product of photosynthesis is starch?
Julius van Sachs
74
Who gave the first action spectrum of photosynthesis?
Englemann
75
Which alga did Englemann use to give his action spectrum?
Cladophora
76
Who recognised CO2 as the impure air?
Lavosier
77
Who gave the concept of two photosystems?
Arnold and Emerson
78
Who proved that the oxygen produced in photosynthesis is liberated from water?
van Neil
79
What is the sharp reduction in photosynthesis when monochromatic beam of wavelength greater than 680nm is used called?
Red drop
80
Who reported the red drop effect for the first time?
Emerson
81
What is the enchancement effect?
Increase in photosynthesis when two monochromatic beams of different wavelength are used together.
82
What does the enhancement effect in plants prove?
Existence of two photosystems.
83
Who discovered that green parts of plants release oxygen?
Jan Ingenhousz
84
Who first discovered chlorophyll in plants?
Julius von Sachs
85
How do the chloroplasts arrange themselves in a mesophyll cell?
Along the walls
86
What is the colour of chlorophyll a?
Blue-green
87
What is the colour of chlorophyll b?
Yellow green
88
Why are no NADPH formed in cyclic photophosphorylation?
CYclic photophosphorylation occurs inside stroma lamella where NADP reductase enzymes are missing,
89
Where are protons transported as electrons move through the photosystems?
Across the membrane into the lumen
90
Where is the primary acceptor of electrons located according to chemiosmotic hyptothesis?
Towards the outer side of the membrane
91
What are the parts of ATP synthase enzyme?
CF0- embedded in the thylakoid membrane
| Cf1- faces stroma
92
What kind of transport occurs in chemiosmotic synthesis?
Facililtated diffusion
93
How did Melvin Calvin discover that the first CO2 fixation product was a 3 carbon organic acid?
Using radioactive techniques
94
Which is the most crucial step of the calvin cycle?
Carboxylation
95
Bundle sheath cells have very thin walls. True/false?
False. They have very thick walls.
96
What does RuBisCO have greater affinity for- CO2 or O2?
CO2
97
Which plants shows greater tolerance to higher temperatures- C3 or C4?
C4
98
What kind of relationship do incident light and CO2 fixation rates have at low light intensities?
Linear relationship
99
At what percentage of full sunlight does light saturation occur?
10%
100
Which plants show saturation of photosynthesis at lower concentration of CO2?
C4 plants
101
Out of light reactions and dark reactions in photosynthesis which is affected more by higher temperatures?
Dark reaction
