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Assertion : Carotenoids play a protecti...

Assertion : Carotenoids play a protective role for the chloroplasts during photolysis of water.
Reason : Carotenoids pick the nascent oxygen by means of their double bonds and convert the same into molecular state.

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true but R is false

D

If both A and R are false

Text Solution

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The correct Answer is:
A
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Read the passage given below and answer the question: The transition metals when exposed to oxygen at low and intermediate temperatures form thin, protective oxide films of up to some thousands of Angstroms in thickness. Transition metal oxides lie between the extremes of ionic and covalent binary compounds formed by elements from the left or right side of the periodic table. They range from metallic to semiconducting and deviate by both large and small degrees from stoichiometry. Since d- electron bonding levels are involved, the cations exist in various valence states and hence give rise to a large number of oxides. The crystal structures are often classified by considering a cubic or hexagonal close-packed lattice of one set of ions with the other set of ions filling the octahedral or tetrahedral interstices. The actual oxide structures, however, generally show departures from such regular arrays due in part to distortions caused by packing of ions of different size and to ligand field effects. These distortions depend not only on the number of d-electrons but also on the valence and the position of the transition metal in a period or group. (source: Smeltzer, W. W., & Young, D. J. (1975). Oxidation properties of transition metals. Progress in Solid State Chemistry, 10, 17-54.) In the following question, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the choices on the basis of the above passage. Assertion : Transition metals form protective oxide films. Reason: Oxides of transition metals are always stoichiometric.

Read the passage given below and answer the question: The transition metals when exposed to oxygen at low and intermediate temperatures form thin, protective oxide films of up to some thousands of Angstroms in thickness. Transition metal oxides lie between the extremes of ionic and covalent binary compounds formed by elements from the left or right side of the periodic table. They range from metallic to semiconducting and deviate by both large and small degrees from stoichiometry. Since d- electron bonding levels are involved, the cations exist in various valence states and hence give rise to a large number of oxides. The crystal structures are often classified by considering a cubic or hexagonal close-packed lattice of one set of ions with the other set of ions filling the octahedral or tetrahedral interstices. The actual oxide structures, however, generally show departures from such regular arrays due in part to distortions caused by packing of ions of different size and to ligand field effects. These distortions depend not only on the number of d-electrons but also on the valence and the position of the transition metal in a period or group. (source: Smeltzer, W. W., & Young, D. J. (1975). Oxidation properties of transition metals. Progress in Solid State Chemistry, 10, 17-54.) In the following question, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the choices on the basis of the above passage. Assertion: Cations of transition elements occur in various valence states Reason: Large number of oxides of transition elements are possible.

TRUEMAN BIOLOGY-PHOTOSYNTHESIS IN HIGHER PLANTS-MULTIPLE CHOICE QUESTIONS
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  2. Assertion : In oxidative phosphorylation , the electrons flow from...

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  3. Assertion : Carotenoids play a protective role for the chloroplast...

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  4. Identify the correct sequence of enzymes given below which participate...

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  5. Consider the following:- 1. Cytochrome b(6) - 2. Cytochrome f- 3. Pl...

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  6. The substrate for photorespiration is

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  7. In what respects are the photosynthesis adaptations of C(4) plants and...

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  8. Consider the following statement: A.The layer of bundle sheath cells...

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  9. Find out the wrong statement

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  10. A plant biochemist received a spicemen from a fellow scientist who not...

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  11. The C(2) glycolate cycle is also known as

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  12. Carotenoids are

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  13. Consider the following statement: - 1. PEP carboxylase has a high spe...

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  14. Consider the following statements A. The chloroplast pigments are fa...

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  15. Which of the following statements is true for photosynthesis?

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  16. Which of the following is a true?

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  17. Which of the following is false statement?

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  18. Select the correct statement for photosynthesis

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  19. Select the wrong statement

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  20. Cyclic photophosphorylation results in the formation of

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