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[A]: The nitrogen content of the plant c...

[A]: The nitrogen content of the plant cannot be detected accurately by ash analysis.
[R]: On burning of plant, nitrogen component is given off as `NH_3` & other gases

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:
A
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Which of the following plants cannot fix atmospheric nitrogen?

[A] : Insectivorous plants grow in carbohydrate deficiend soil. [R] : Insectivorous plants grow in nitrogen rich soil.

Uptake of nitrogen by plants occurs in all of the given forms, except

— is a mixture of gases given off when animal and plant matter rots in the absence of air.

[A]: Amino acids are converted into ammonia by a group bacteria called ammonifying bacteria. [R]: The majority of plants, however, can not utilize ammonium compounds as a source of nitrogen

Consider the following w.r.t riteria for essentiality of an elements. (i) In the absence of the element the plants do not complete their life cycle or set the seeds (ii) Requirement of the element must be specific and replaceable by another element (iii) Element cannot be directly involved in the metabolism of plant (iv) Deficiency of any one element cannot be met by supplying some other elemtnt How many are incorrect?

TRUEMAN BIOLOGY-Plant Physiology -ASSERTION AND REASON
  1. [A]: Sulphur stabilizes protein structure. [R]: It does not partici...

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  2. [A]: Stomata remain open during day [R]: Stomata help in gaseous exc...

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  3. [A]: The nitrogen content of the plant cannot be detected accurately b...

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  4. [A]: Submerged plants, get CO2 in-the form of CO3^(-) & HCO3^(-3) [R...

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

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  6. [A]: Antitranspirants are material applied to plants for retarding tra...

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

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

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

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

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

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

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

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

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

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

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

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

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  19. [A]: Rhoea discolor leaves contain anthocya-nin in epidermal cells [...

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

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