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A : N, P, K are called critical eleme...

A : N, P, K are called critical elements.
R : They become deficient easily in soil due to leaching and higher requirement.

A

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

B

If both Assertion and Reason are true, but the Reason is not the correct explanation of the Assertion.

C

If Assertion is true, but Reason is false.

D

If both Assertion and Reason are false.

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The correct Answer is:
D
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Assertion: N, P, K are called critical elements. Reasoning: They become deficient easily in soil due to leaching and higher requirement.

Read the following statements and select the incorrect ones. (i) The co-ordinated activities of the legume and Rhizobium bacteria depend on chemical interactions between the symbiotic partners. (ii) Leguminous roots secrete chemical attractants that attract Rhizobium bacteria living nearby. (iii) N, P and K usually do not get deficient in soil due to their low plant requirement (iv) Nitrogen cycle is regular circulation of nitrogen amongst living organisms with its reservoir pool in lithosphere and cycling pool in atmosphere.

The essential conditions for liquefaction of gases were discovered by Andrews in 1869 as a result of his study of pressure-volume-temperature relationship for CO_(2) . It was found that above a certain temperature, it was impossible to liquefy a gas whatever the pressure was applied. The temperature below which the gas can be liquefied by the application of pressure alone is called critical temperature (Tc). The pressure required to liquefy a gas at this temperature is called the critical pressure (Pc). The volume occupied by one mole of the substance at the critical temperature and pressure is called critical volume. Critical constants are related with van der waals' constant as follows: V_( c) = 3b, P_( c) =a/(27b^(2)), T_( c) =(8a)/(27 Rb) The values of critical volumes of four gases A, B, C and D are 0.025L, 0.312L, 0.245L and 0.432L respectively. The gas with larger molecular diameter will be :

A is a set containing n elements. A subset P of A is chosen. The set A is reconstructed by replacing the elements of P. A subset of A is again chosen. Find the number of ways of choosing P and Q, so that (i) P capQ contains exactly r elements. (ii) PcapQ contains exactly 2 elements. (iii) P cap Q=phi

Consider the following w.r.t criteria 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 element How many are incorrect?

Unstable nuclei attain stability through disintegration. The nuclear stability is related to neutron proton ratio (n//p) . For stable nuclei n//p ratio lies close to unity for elements with low atmoic numbers (20 or less) but it is more than 1 for nuclei having higher atomic numbers. Nuclei having n//p ratio either very high or low undergo nuclear transformation. When n//p ratio is higher than required for stability, the nuclei have the tendency to emit beta -rays. while when n//p ratio is lower than required for stability, the nuclei either emits alpha -particles or a positron or capture K -electron. For reaction ._(92)M^(238) rarr ._(y)N^(x) + 2 ._(2)He^(4), ._(y)N^(x) rarr ._(B)L^(A) + 2 ._(-1)e^(0) The number of neutrons in the element L is

Unstable nuclei attain stability through disintegration. The nuclear stability is related to neutron proton ratio (n//p) . For stable nuclei n//p ratio lies close to unity for elements with low atmoic numbers (20 or less) but it is more than 1 for nuclei having higher atomic numbers. Nuclei having n//p ratio either very high or low undergo nuclear transformation. When n//p ratio is higher than required for stability, the nuclei have the tendency to emit beta -rays. while when n//p ratio is lower than required for stability, the nuclei either emits alpha -particles or a positron or capture K -electron. Unstalbe substance exhibit high radioactivity due to

A neutral atom of an element has 2K,8L, 9M and 2N electrons . The total number of p electons are

A fan operates at 200 volt (DC) consuming 1000W when running at full speed . It's internal wiring has resistance 1 Omega . When the fan runs at full speed , its speed becomes constant. This is because the torque due to magnetic field inside tha fan is balanced by the torque due to air resistance on the blades of the fan and torque due to friction between the fixed part and the shaft of the fan. The electrical power going into the fan is spent (i) in the internal resistance as heat, call it P_(1)(ii) in doing work against internal friction and air resistance producing heat, sound etc. call it P_(2) . When the coil of fan rotates, an emf is also induced in the coil. This opposes the external emf applied to snd the current into the fan. This emf is called back-emf,call it 'e' . Answer the following questions when the fan is running at full speed. The value of power P_(1) is

A fan operates at 200 volt (DC) consuming 1000W when running at full speed . It's internal wiring has resistance 1 Omega . When the fan runs at full speed , its speed becomes constant. This is because the torque due to magnetic field inside tha fan is balanced by the torque due to air resistance on the blades of the fan and torque due to friction between the fixed part and the shaft of the fan. The electrical power going into the fan is spent (i) in the internal resistance as heat, call it P_(1)(ii) in doing work against internal friction and air resistance producing heat, sound etc. call it P_(2) . When the coil of fan rotates, an emf is also induced in the coil. This opposes the external emf applied to snd the current into the fan. This emf is called back-emf,call it 'e' . Answer the following questions when the fan is running at full speed. The value of power P_(2) si

CENGAGE BIOLOGY ENGLISH-MINERAL NUTRITION-ARCHIVES
  1. A : N, P, K are called critical elements. R : They become deficie...

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  2. A plant requires magnesium for :

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  3. Which of the following is a flowering plant with nodules containing fi...

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  4. About 98 per cent of the mass of everv living organism is composed of ...

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  5. Which one of the following elements is not an essential micronutr...

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  6. Carbohydrates are commonly found as starch in plant storate organs. Wh...

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  7. Nitrogen fixation in root nodules of Alnus is brought about by

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  8. Nitrogen fixation in root nodules of Alnus is brought about by

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  9. Guard cells help in

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  10. Manganese is required in

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  11. Which of the following is a symbiotic nitrogen fixer

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  12. Which one of the following pairs is wrongly matched?

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  13. An element playing important role in nitrogen fixation is

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  14. Which one of the following is not a micronutrient?

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  15. The chief water conducting elements of xylem in gymnosperms are

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  16. which one of the following structures between two adjacent cells is an...

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  17. One of the free-living, anaerobic nitrogenfixer is

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  18. The common nitrogen-fixer in paddy fields is

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  19. Nitrifying bacteria

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  20. Which one of the following elements (miconutrients) in plants is not r...

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  21. A prokaryotic autotrophic nitrogen fixing sym- biont-is found in

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