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Assertion. The nuclear envelope acts as ...

Assertion. The nuclear envelope acts as an interface between the genetic component of the cell and the cytoplasm.
Reason. It thus protects DNA against the mutagenic effect of cytoplasmic enzyme

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

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Nuclear charge actually experienced by an electron is termed as effective nuclear charge The effective nuclear Z^(**) actually depends on type of shell and orbital in which electron is actually present. The relative extent to which the various orbitals penetrate is . s gt p gt d gt f (for the same value of n) The phenomenon in which penulitmate shell electrons act as screen or shield in between nucleus adn valence shell electrons and there by reducing nuclear charge is known as sheilding effect. The penultimate shell electrons repel the valence shell electron to keep them loosely held with nucleus . It is thus evident that more is the shielding effect, lesser is the effective nuclear charge and lesser is the ionizatio energy. Which of the following is not concerned to effective nuclear charge?

Assertion (A) Most mineral must enter the root by the active absorption into the cytoplasm of epidermal cells. Reason (R ) This transportation needs energy in the form of ATP . Some ions also move into the epidermal cells passively.

Nuclear charge actually experienced by an electron is termed as effective nuclear charge. The effective nuclear charge Z^(**) actuall ydepends on type of shell and orbital in which electron is actually present. The relative extent to which the various orbitals penetrate the electron clouds of other orbitals is s gt p gt d gt f (for the same value of n) The phenomenon in which penultimate shell electrons act as screen or sheild in between nucleus and valence shell electrons and thereby reducing nuclear charge is known as shielding effect. the penultimate shell electrons repel the valence shell electron to keep them loosely held with nucleus. it is thus evident that more is the shielding effect, lesser is the effective nuclear charge and lesser is the ionization energy. Q. Which of the following is not concerned to effective nuclear charge?

Nuclear charge actually experienced by an electron is termed as effective nuclear charge. The effective nuclear charge Z^(**) actuall ydepends on type of shell and orbital in which electron is actually present. The relative extent to which the various orbitals penetrate the electron clouds of other orbitals is s gt p gt d gt f (for the same value of n) The phenomenon in which penultimate shell electrons act as screen or sheild in between nucleus and valence shell electrons and thereby reducing nuclear charge is known as shielding effect. the penultimate shell electrons repel the valence shell electron to keep them loosely held with nucleus. it is thus evident that more is the shielding effect, lesser is the effective nuclear charge and lesser is the ionization energy. Q. Which of the following valence electron experience maximum effective nuclear charge?

Nuclear charge actually experienced by an electron is termed as effective nuclear charge. The effective nuclear charge Z^(**) actuall ydepends on type of shell and orbital in which electron is actually present. The relative extent to which the various orbitals penetrate the electron clouds of other orbitals is s gt p gt d gt f (for the same value of n) The phenomenon in which penultimate shell electrons act as screen or sheild in between nucleus and valence shell electrons and thereby reducing nuclear charge is known as shielding effect. the penultimate shell electrons repel the valence shell electron to keep them loosely held with nucleus. it is thus evident that more is the shielding effect, lesser is the effective nuclear charge and lesser is the ionization energy. Q. Which of the following valence electron experience maximum effective nuclear charge?

TRUEMEN BIOLOGY ENGLISH-Living World -ASSERTION AND REASON
  1. [A] : Peroxisomes occur , both in plants and animals . [R] : Peroxis...

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  2. [A] : Glyoxysome are present only in plant cells . [R] : They are fo...

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  3. Assertion. The nuclear envelope acts as an interface between the genet...

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  4. [A] : One or many nucleoli are present in a nucleus . [R] :The nucle...

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  5. [A] : Nucleus controls metabolic as well as hereditary activities of t...

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  6. [A] : Homeostasis is the maintenance of a stable internal environment ...

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  7. [A] : Usually the cells of animals and plants have controlled growth ....

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  8. [A] : Behavioural activities that are correlated with a one week cycle...

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  9. [A] : Prokaryotic cell shows no cyclosis. [R] : Eukaryotic cell show...

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  10. [A] : No energy can be released in the cell in the absence of mitochon...

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  11. [A] : The lymphocytes have well developed lysosomes . [R] : Because ...

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  12. [A] : Prokaryotes lack Mitochondria. [R] : Their plasma membrane bea...

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  13. [A] : Nuclear membrane of karyotheca forms an envelope-like structure ...

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  14. [A] : The space between nuclear envelope and nucleolus is filled by ka...

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  15. [A] : Leucocytes can digest any thing harmful they eat . [R] : Leuco...

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  16. [A] : The nuclear membrane forms envelope like structure called nuclea...

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  17. [A] : The nuclear envelope is the derivative of membrane of mitochondr...

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  18. [A] : Rods and cones of retina are modified cilia . [R] : Cilia are ...

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  19. [A] : Golgi bodies and dictyosomes are synonymous . [R] : In plants ...

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  20. [A] : Mitochondria have evolved from bacteria . [R] : Mitochondria a...

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