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Water vapour comes out from the plant le...

Water vapour comes out from the plant leaf through the stomata} opening. Through the same stomata! opening carbon dioxide dif- fuses into the plant during photosynthesis. Reason out the above statements using one of following options

A

One process occurs during day time and the other at night

B

Both the processes cannot happen simultaneously

C

Both processes can happen together because the diffusion coefficients of water vapours and `CO_(2)` are different

D

The above processes happen only during night time

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The correct Answer is:
B
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Water vapour comes out from the plant leaf through the stomatal opening. Through the same stomatal opening carbon dioxide diffuses into the plant during photosynthesis. Reason out the above statements using the following options.

Water vapour comes out from the plant leaf through the stomatal opening. Through the same stomatal opening carbon dioxide diffuses into the plant during photosynthesis. Reason out the above statements using the following options.

Water vapour comes out from the plant leaf through the stomatal opening. Through the same stomatal opening carbon dioxide diffuses into the plant during photosynthesis. Reason out the above statements using the following options. (a) Both processes cannot happen simultaneously. (b) Both processes can happen together because the diffusion coefficient of CO_(2) and water is different. (c) The above processes happen only during night time. (d) One process occurs during day time, and the other at night.

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Which one of the following plants keep its stomata open during the night and close during the day?

All plants give out oxygen during day carbon dioxide during night . Do you agree with this statement ? Give reason

A metal foil is at a certain distance from an isotropic point source that emits energy at the rate P. Let us assume the classical physics to be applicable. The incident light energy will be absorbed continuously and smoothly. The electrons present in the foil soak up the energy incident on them. For simplicity , we can assume that the energy incident on a circular path of the foil with radius 5xx10^(-11) m (about that of a typical atom ) is absorbed by a single electron. The electron absorbs sufficient energy to break through the binding forces and comes out from the foil. By knowing the work function, we can calculate the time taken by an electron to come out i.e., we can find out the time taken by photoelectric emission to start. As you will see in the following questions, the time decay comes out to be large, which is not practically observed. The time lag is very small. Apparently, the electron does not have to soak up energy . It absorbs energy all at once in a single photon electron interaction. if work function of the metal of the foil is 2.2 eV, the time taken by electron to come out is nearly

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A metal foil is at a certain distance from an isotropic point source that emits energy at the rate P. Let us assume the classical physics to be applicable. The incident light energy will be absorbed continuously and smoothly. The electrons present in the foil soak up the energy incident on them. For simplicity , we can assume that the energy incident on a circular path of the foil with radius 5xx10^(-11) m (about that of a typical atom ) is absorbed by a single electron. The electron absorbs sufficient energy to break through the binding forces and comes out from the foil. By knowing the work function, we can calculate the time taken by an electron to come out i.e., we can find out the time taken by photoelectric emission to start. As you will see in the following questions, the time decay comes out to be large, which is not practically observed. The time lag is very small. Apparently, the electron does not have to soak up energy . It absorbs energy all at once in a single photon electron interaction. If power of the source P is 1.5 W and distance of the foil from the source is 3.5 m, the energy received by an electron per second is

Leguminous plants are able to fix atmospheric nitrogen through the process of symbiotic nitrogen fixation. Which one of the following statements is not correct during this process of nitrogen fixation?

DINESH PUBLICATION ENGLISH-TRANSPORT IN PLANTS-REVISION QUESTIONS FROM COMPETITIVE EXAMS
  1. Water potential of soil quantified in term of

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  2. Identify the wrong statement .

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  3. Find the correct pair of statements (i) Influx of Cl- into guard ce...

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  4. Arrange the following in ascending order based on their solute concent...

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  5. Photosynthates are translocated from source to sink organs mainly in t...

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  6. The movement of water and minerals in xylem and the movement of phloem...

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  7. In the given diagram, which is the initial condition of plasmolysis

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  8. Water exudation through hydathodes is

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  9. Apoplast movement of water occurs through:

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  10. In plants opening of stomata is regulated by

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  11. Incipient plasmolysis is

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  12. Basis of stomatal opening is

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  13. The movement of water molecules from a region of high concentration t...

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  14. Which of the following equations is correct in respect of osmotic phen...

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  15. X and Y are adjacent living cells. The cell X has solute potential (Ps...

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  16. Water vapour comes out from the plant leaf through the stomata} openin...

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  17. A few drops of sap were collected by cutting across a plant stem by a ...

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  18. A plasmolysed cell can be deplasmolysed by placing it in

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  19. Assertion : Translocation of sugar from source to sink is defined as p...

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  20. Which of the following facilitates opening of stomatal aperture ?

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