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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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The correct statement about respiration are (i) In cockroach gaseous exchange occurs mainly between tracheoles and haemolymph (ii) increase in inspiratory capacity does not involve an increase in tidal volume (iii) partial pressure of oxygen in blood is less than that in alveoli (iv) chloride shift in erythrocytes maintain the ionic balance

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 nitrogen content of the plant cannot be detected accurately b...

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  2. [A]: Submerged plants get CO2 in the form of carbonates and bicarbonat...

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

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  4. [A]: Antitranspirants are used to retard tran- spiration. [R]: AbA ...

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  5. Assertion. Calcium deficiency symptoms first appear in the apical regi...

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  6. Assertion: Deficiency of sulpur causes chlorosis in plants Reason : ...

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  7. Assertion : Water and mineral uptake by root hairs from the soil occur...

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  8. [A]: Stomata open when guard cells have more H^+ . [R]: Increased K^+...

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  9. [A]: In washed beet root cylinders, betacyanin pigment does not come o...

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  10. [A]: Rate of transpiration is directly propor- tional to relative humi...

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  11. [A]: Root cells have lower OP than leaf cells. [R]: Root cells have...

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  12. [A]: Root pressure is largely responsible for ascent of sap in harbace...

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  13. [A]: The nodulated bacteria fix nitrogen in the presence of leg Hb. ...

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  14. [A]: Plants growing under trees show less photosynthesis. [R]: Gree...

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  15. [A]: Chlorophylls usually show red fluores- cence though they absorb b...

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  16. Asserion : Long distance flows of photoassimilates in plants occurs t...

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  17. [A]: Rhoeo discolor leaves contain anthocya-nin in epidermal cells [...

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  18. [A]: Ringing/Girdling experiments involved removal of all tissues outs...

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  19. [A]: Action spectra for photosynthesis help to identify the pigments i...

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  20. [A] : C3 & C4 cycle can not occur in the same plant [R] : C3 cycle ...

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