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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 the day time , and the othet at night

B

Both processes cannot happen simultaneously

C

Both processes can happen together because the diffusion coefficient of water and `CO_(2)` is different

D

The above processes happen only during night time

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The correct Answer is:
C
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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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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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AAKASH INSTITUTE ENGLISH-TRANSPORT IN PLANTS -Assignment (Section C) Previous Year Questions
  1. The water potential of pure water is

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

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

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  4. Root pressure develops due to

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  5. A column of water within xylem vessels of tall trees does not break un...

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  6. Transpiration and root pressure cause water to rise in plants by

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  7. In a ring girdled plant

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  8. Which one gives the most valid and recent explanation for stomatal mov...

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  9. Which of the following criteria does not pertain to facilitated transp...

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  10. Lenticels are involved in

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  11. Guttation is the result of

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

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  13. Given below is the diagram of a stomatal apparatus. In which of the fo...

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  14. Guard cells help in

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  15. The rupture and fractionation do not usualy occur in the water column ...

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  16. Two cells A and B are contiguous, Cell A has osmotic pressure 10 atm, ...

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  17. The translocation of organic solutes in sleve tube membres is supportt...

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  18. Potometer works on the principle of

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  19. Water entering the root due to diffusion is part of

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  20. When water moves through a semipermeable membrane then which of the fo...

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