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1. Photosynthetic pigments are located in _________.
A. Stroma
B. Grana
C. Cytoplasm
D. Thylakoids
ANSWER: D.Thylakoids
SOLUTION :Photosynthetic pigments are located in the thylakoid membrane of chloroplasts in plants and photosynthetic bacteria.
2. The Dark reaction of photosynthesis was worked out by _______.
A. Hatch and Slack
B. Melvin Calvin
C. Arnold
D. Emerson
ANSWER:B.Melvin Calvin
SOLUTION:The dark reaction was discovered by three scientists namely Calvin, Benson and Bassham and so this cycle is also called as the Calvin- Benson- Bassham cycle. This reaction is also called by many other names such as C3 cycle or reductive pentose phosphate cycle.
3. During photosynthesis oxygen is evolved from _____.
A. Carbohydrates
B. Proteins
C. Sunlight
D. Water
ANSWER :D.Water
SOLUTION:This light energy is then used to produce ATP and to split water molecules to form oxygen and hydrogen. This splitting of the water molecules to form oxygen and hydrogen is referred to as photolysis. Thus, oxygen evolved during photosynthesis is from water.
4. Photosynthetic pigments absorb_________.
A. U V radiation
B. I R radiation
C. Visible radiation
D. Gama radiation
ANSWER: C.Visible radiation
SOLUTION:photosynthetic organisms contain light-absorbing molecules called pigments that absorb only specific wavelengths of visible light, while reflecting others.
5. In cyclic photophorylation the high energy electrons are driven out from _________.
A. Chlorophyll a 683
B. P 700
C. Chlorophyll a 673
D. P 870
ANSWER:B.P 700
SOLUTION:In cyclic photophosphorylation, the lowest energy electrons are driven out from P700. This process occurs in the lamellae of chloroplasts and is a light-dependent reaction.
6. The hypothesis that all photosynthesis organisms require a source of hydrogen was first proposed by ___________.
A. Van Neil
B. Hatch and Slack
C. Hill
D. Rubber and Kaman
ANSWER: A.Van Neil
SOLUTION:In 1931, Van Niel suggested a hypothesis which stated that all photosynthetic species need a hydrogen supply. This supply is water in plants and that oxygen is produced by the splitting of water.
7. In the photosyntesis process, PS ll absorbs energy at or just below _________.
A. 700 nm
B. 870 nm
C. 680 nm
D. 780 nm
ANSWER:C.680 nm
SOLUTION : In the photosynthetic process, PS II absorbs energy at or just below 680 nm.
8. The amount of ATP required for the synthesis of one glucose molecule in C4 pathway is _______.
A. 18 ATP
B. 30 ATP
C. 12 ATP
D. 24 ATP
ANSWER: C.12 ATP
SOLUTION:In C4 plants, the C4 pathway requires 2 equivalent additional ATPs for each turn. So for 6 turns, it will require 12 equivalent additional ATP molecules. Altogether, 12 + 18 = 30 equivalent ATPs are required to produce one molecule of glucose.
9. In bacterial photosynthesis comes from _______.
A. H2S
B. H2O
C. H2SO4
D. NH3
ANSWER:A.H2S
SOLUTION: Thus, the correct answer is ‘Hydrogen sulphide. ‘
10. Isotopes popularly known to have been used in study of photosynthesis________.
A. C16 and N15
B. C14 and O16
C. P32 and C12
D. C11 and P32
ANSWER: B. C14 and O16
SOLUTION:
C14 and O16