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[A]: The evolution of molecular oxygen i...

[A]: The evolution of molecular oxygen is con- cerned with photosystem-1 (PS-I).
[R]: The photosystem-11 (PS-II) is not involved in the evolution of oxygen

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 and R is false

D

If both A and R are false

Text Solution

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The correct Answer is:
D
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[A]: Hill and Bendall proposed Z-scheme and suggested that photosystems operate in series. [R]: The light-dependent reactions require the participation of two light gathering units called PS-I and PS-I I.

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Go through the following statements carefully i) Compared to many other organisms, bacteria as a group show the most extensive metabolic diversity. ii) Mycoplasma die in the absence of oxygen iii) Cyanobacteria often form blooms in polluted water bodies. iv) No pathogenic mycoplasma have been reported so far Which of these are correct? 1. (i), (ii) and (iii) 2. (i), (iii) 3. (ii), (iii) and (iv) 4. (iii) & (iv)

This question has statement I and Statement II. Of the four choices given after the statements, choose the one that best describes the two Statements. (1) Statement-I is true, Statement-II is true, Statement-II is a correct explanation of Statement-I (2) Statement-I is true, Statement-II is true,Statement-II is not a correct explanation of Statement-I (3)Statement-I is a true , Statement-II is false (4) Statement-I is false, Statement-II is true Statement 1 : The nearly tetrahedral arrangement of the orbitals about the oxygen atom allows each water molecule to form hydrogen bonds with as many as four neighbouring water molecules. Statement 2 : In ice each water molecule forms four hydrogen bonds as each molecule forms four hydrogen bonds as each molecule is fixed in the space.

Write down the thermochemical equations for the following reactions: (i) A 1 mol sample of methane gas reacts with 2 mol of oxygen gas to form 1 mol of carbon dioxide and 2 mol of water. In this reaction, 890.5 kJ of heat is produced. (ii) A 1 mol sample of carbon (graphite) reacts with 1 mol of oxygen tof orm 1 mol fo carbon dioxide gas. the heat evolved in this reaction is 393.5 kJ. (iii) 6 mol of carbon dioxide gas reacts with 6 mol of water to form 6 mol of oxygen gas and 1 mol of glucose. the heat absorbed in this reaction is 2200 kJ.

The temperature of 20 g of oxygen gas is raised from 10^(@)C to 90^(@)C . Find out the heat supplied, the rise in internal energy and the work done by the gas, if the temperature rises at (i) constant volume. (ii) constant pressure. Given the specific heats of oxygen are 0.155 cal cdot g^(-1) cdot^(@)C^(-1) at constant volume, and 0.218 cal cdot g^(-1) cdot^(@)C^(-1) at constant pressure.

TRUEMAN BIOLOGY-Plant Physiology -ASSERTION AND REASON
  1. [A]: The light dependent reactions occur in thylakoids. [R]: In thyl...

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  2. [A]: Tropical movements occuring in response to water stimulus are cal...

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  3. [A]: The evolution of molecular oxygen is con- cerned with photosystem...

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  4. [A]: Hill and Bendall proposed Z-scheme and suggested that photosystem...

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  5. [A]: Rhizobial aggregates have been observed at distinct sites on curl...

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  6. [A]: Light is very important external factor of transpiration. [R]:...

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  7. [A]: Wax, resin and suberin coating on the surface of plant parts redu...

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  8. [A]: Gibberellic acid when added to isolated aleurone layer, induces a...

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  9. Assertion : Auxillary buds, in actively growing herbaceous plants, gen...

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  10. Assertion : If you burn a plant , its nitrogen component is given of...

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  11. [A]: Amino acids are converted into ammonia by a group bacteria called...

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  12. [A]: Due to excessive use of fertilizers, the available water to the p...

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  13. [A]: Vernalization is also called as yarovization. [R]: In short day...

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  14. [A]: Fundamental factor in the vernalization is low temperature. [R...

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  15. [Aj: ABA plays an important role in plants during water stress and dro...

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  16. (A]: Cytokinins help in retention of cholorophyll and delayed senescen...

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  17. [A]: The germination of lettuce seeds is stimulated by red light and i...

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  18. [A]: The far-red form of the phytochromes ab- sorb light at 740 nm. ...

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  19. [A]: Elongation and division of cells are pro- moted by gibberellins. ...

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  20. [A]: Senescence effect can be reversed by cytokinin. [R]: The loss ...

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