If in a population of size ”N” the birth rate is represented as “b” and the death rate as “d”, the increase or decrease in “N” during a unit time period ”t” will be: The equation given above can also be represented as: What does ”r” represent. Write any one significance of calculating ”r” for any population?

r here represents the intrinsic rate of increase of population and it is equal to the difference in the natality (birth rate) and mortality (death rate). The 'r' is called the 'intrinsic rate of natural increase. It' is a very important parameter chosen for assessing impacts of any biotic or abiotic factor on population growth. If the value of 'r' is increasing it signifies the growth of the population and if it is going down then the population growth has slowed down.

The nuclear radius of Al 13 27 is 3 . 6 fermi. Find the nuclear radius of Cu 29 64 .

Radius of Al is r Al = r ∘ A 1 3 = r ∘ 27 1 3 = 3 . 6 fermi, here A is atomic mass number corresponding to Al . For the radius of Cu is r Cu = r ∘ A 1 3 = r ∘ 64 1 3 . Now, r Cu r Al = 64 1 3 27 1 3 = 4 3 ⇒ r Cu = r Al × 4 3 = 4 . 8 fermi. Hence, the nuclear radius of Cu 29 64 is 4 . 8 fermi.

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Which state in India has the highest percentage of net sown area?

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Important Questions on Nuclei

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Physics>Modern Physics>Nuclei>Size of the Nucleus

The principle of competitive exclusion was stated by

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Physics>Modern Physics>Nuclei>Size of the Nucleus

The ratio of mass densities of nuclei of

^{40} C a

and

^{16} O

is close to:

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Physics>Modern Physics>Nuclei>Size of the Nucleus

An association of individuals of different species living in the same habitat and having functional interactions is:

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Physics>Modern Physics>Nuclei>Size of the Nucleus

If 8 individuals in a population of 80 butterflies die in a week, calculate the death rate of population of butterflies during that period.

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Physics>Modern Physics>Nuclei>Size of the Nucleus

Given below is the representation of the extent of the global diversity of invertebrates. What groups the four portions (A-D) represent respectively?
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Physics>Modern Physics>Nuclei>Size of the Nucleus

State two observations made by the German naturalist, Alexander von Humboldt during his extensive explorations in South American Jungles.

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Physics>Modern Physics>Nuclei>Size of the Nucleus

Explain any two reasons which causes the losses of biodiversity.

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Physics>Modern Physics>Nuclei>Size of the Nucleus

Explain Commensalism and mutualism with examples

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Physics>Modern Physics>Nuclei>Size of the Nucleus

Write the difference between genetic biodiversity and species biodiversity that exists at all the levels of biological organisations.

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Physics>Modern Physics>Nuclei>Size of the Nucleus

"India has greater ecosystem diversity than Norway." Do you agree with this statement? Give reasons in support of your answer.

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Physics>Modern Physics>Nuclei>Size of the Nucleus

Differentiate between an ‘Expanding age pyramid’ and a ‘Stable age pyramid’. Substantiate your answer with diagrams.

HARD

Physics>Modern Physics>Nuclei>Size of the Nucleus

If area of triangle is

35

sq. units with vertices

(2, - 6), (5, 4)

and

(k, 4),

then

k

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Physics>Modern Physics>Nuclei>Size of the Nucleus

If in a population of size ”N” the birth rate is represented as “b” and the death rate as “d”, the increase or decrease in “N” during a unit time period ”t” will be:

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The equation given above can also be represented as:

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What does ”r” represent. Write any one significance of calculating ”r” for any population?

HARD

Physics>Modern Physics>Nuclei>Size of the Nucleus

Match the following and select the correct option:

(a)	Earthworm	(p)	Pioneer species
(b)	Succession	(q)	Detrivore
(c)	Ecosystem service	(r)	Natality
(d)	Population growth	(s)	Pollination

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Physics>Modern Physics>Nuclei>Size of the Nucleus

Explain the difference between commensalism and mutualism types of interactions, with the help of a suitable example of each.

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Physics>Modern Physics>Nuclei>Size of the Nucleus

Analyse the effects of ‘Alien species invasion’ on the biodiversity of a given area. Provide two examples.

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Physics>Modern Physics>Nuclei>Size of the Nucleus

If the point charge is moved to a distance $d$ from the centre of the square and the side of the square is doubled, explain how the electric flux will be affected.

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Physics>Modern Physics>Nuclei>Size of the Nucleus

The nuclear radius of

{}_{13}^{27}{Al}

3.6

fermi. Find the nuclear radius of

{}_{29}^{64}{Cu}

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Physics>Modern Physics>Nuclei>Size of the Nucleus

A nucleus with

A = 235

splits into two nuclei whose mass numbers are in the ratio

2 : 1

. If

R_{0} = 1.4 fm

, find the radii of the new nuclei.

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Physics>Modern Physics>Nuclei>Size of the Nucleus

The stable nucleus that has a radius

{\frac{1}{3}}^{rd}

of that of

{Os}_{76}^{189}

is,

Which state in India has the highest percentage of net sown area?

Important Questions on Nuclei

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