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Recent questions tagged class 12

Which recombinant vaccine is currently used in vaccination programme?

asked Apr 9, 2019 by priyanka.clay6

1 answer

Isah Upanishad says ‘let no one species encroach over the rights and privileges of other species. <br> One can enjoy nature by giving up greed’. But human activities have accelerated the rate of extinction of species in recent times. <br> (a) Name any four such mass activities. <br> (b) Describe how each of these activities leads to loss of biodiversity. <br> ( c) What value is taught by the Upanishad?

asked Apr 9, 2019 by priyanka.clay6

1 answer

a) Taking one example each of habitat loss and fragmentation, explain how the two are responsible for biodiversity loss. <br> b) Explain two different ways of biodiversity conservation.

asked Apr 9, 2019 by priyanka.clay6

1 answer

What are the two types of desirable approaches to conserve biodiversity? State the differences between the two

asked Apr 9, 2019 by priyanka.clay6

1 answer

Explain giving one example, how co-extinction is one of the causes of loss of biodiversity. List the three other causes also (without description).

asked Apr 9, 2019 by priyanka.clay6

1 answer

Alien species are highly invasive and are a threat to indigenous species. Substantiate this statement with any three examples.

asked Apr 9, 2019 by priyanka.clay6

1 answer

How to conserve biodiversity?

asked Apr 9, 2019 by priyanka.clay6

1 answer

How do sanctuaries differs from national parks in terms of conservation?

asked Apr 9, 2019 by priyanka.clay6

1 answer

Would Western Ghats ecosystems be less functional if one of its tree frog species is lost forever? Substantiate your answer in the light of hypothesis proposed by Paul Ehrlich.

asked Apr 9, 2019 by priyanka.clay6

1 answer

In an experiment, the slope of regression (z) is 0.2 and in another experiment the value obtained is 1.2. Explain the two situations in respect of species area relationships.

asked Apr 9, 2019 by priyanka.clay6

1 answer

Biologists are not sure about how many prokaryotic species there might be. Give reasons.

asked Apr 9, 2019 by priyanka.clay6

1 answer

Why is the sobriquet. The Evil Quartet used in context of biodiversity? Name the members of this quartet. Why do we grieve for the genes when a species is lost

asked Apr 9, 2019 by priyanka.clay6

1 answer

What is so special about tropics that might account for their greater biological diversity?

asked Apr 8, 2019 by priyanka.clay6

1 answer

Hot spots are the regions of exceptionally high biodiversity. But they have become regions of accidental habitat loss too. Name the three hot spots of our country. Why are they called hot spot?

asked Apr 8, 2019 by priyanka.clay6

1 answer

Explain rivet popper hypothesis.name the ecologist who proposed it.

asked Apr 8, 2019 by priyanka.clay6

1 answer

White Bengal tigers are protected in zoological parks. Tiger reserves are maintained in western ghats. How do these two approaches differ from each other? Mention the advantages of each one.

asked Apr 8, 2019 by priyanka.clay6

1 answer

Name the sociobioligist who popularized the term biodiversity. Identify the levels of biodiversity in India represented by- <br> a)Diversity amongst amphibians in eastern and western ghats. <br> b)50,000 strains of rice in India. <br> c)Presence of deserts, mangroves and coral reefs of India. <br>

asked Apr 8, 2019 by priyanka.clay6

1 answer

Lantana & Eichornia are examples of two weeds. How do they affect the ecosystem?

asked Apr 8, 2019 by priyanka.clay6

1 answer

There are 34 biodiversity hot spots in the world. What are the criteria of selection of such hot spots?

asked Apr 8, 2019 by priyanka.clay6

1 answer

National parks come under 'in situ' conservation while Zoological parks under 'ex situ' conservation. Comment.

asked Apr 8, 2019 by priyanka.clay6

1 answer

Amazon forests are regarded are "Lungs of the Planet". Why?

asked Apr 8, 2019 by priyanka.clay6

1 answer

Seeds of different genetic strains are kept for long periods in seed banks. Explain the conservative strategy involved in this process.

asked Apr 8, 2019 by priyanka.clay6

1 answer

The species diversity of plants is much less than that of animals. What could be the reason for this and figure out how animals achieved greater diversifications ?

asked Apr 8, 2019 by priyanka.clay6

1 answer

Would the extinction of one insect pollinator affect the ecosystem? Explain.

asked Apr 8, 2019 by priyanka.clay6

1 answer

Columbia located near the equator has nearly 1400 species of birds while new york at 41˚ N has 105 species and Greenland at 71˚ N has only 56 species. Comment.

asked Apr 8, 2019 by priyanka.clay6

1 answer

Identify a,b,c and d in the above pie diagram showing global biodiversity of plants. <br>

asked Apr 8, 2019 by priyanka.clay6

1 answer

Why is genetic variation important in the plant Rauwolfia vomitoria?

asked Apr 8, 2019 by priyanka.clay6

1 answer

What is the expanded for of IUCN?

asked Apr 8, 2019 by priyanka.clay6

1 answer

About 20 species of a Cichlid fish became extinct when a particular fish was introduced in Lake Victoria of Africa. Name the invasive fish.

asked Apr 8, 2019 by priyanka.clay6

1 answer

The amazon rain forest is referred to as ‘the lungs of the planet’. Mention any one human activity which causes loss of biodiversity in this region.

asked Apr 8, 2019 by priyanka.clay6

1 answer

Write the importance of cryopreservation in conservation of biodiversity

asked Apr 8, 2019 by priyanka.clay6

1 answer

Why is India said to have greater ecosystem than Norway?

asked Apr 8, 2019 by priyanka.clay6

1 answer

Mention one application of pollen bank. How are pollen stored in the bank?

asked Apr 8, 2019 by priyanka.clay6

1 answer

Name the unlabelled areas 'a' and 'b' of the pie chart representing the global biodiversity of invertebrates showing their proportionate number of species of major taxa. <br>

asked Apr 8, 2019 by priyanka.clay6

1 answer

Why is tropical environment able to support greater species diversity?

asked Apr 8, 2019 by priyanka.clay6

1 answer

If the distance between two charge is reduced to half then the electrical force between them will become

asked Mar 21, 2019 by meena.clay6

1 answer

The electric potential inside a conductivity sphere

asked Mar 20, 2019 by meena.clay6

1 answer

Torque acting on a electric dipole in a uniform electric fiels $\hat E$

asked Mar 20, 2019 by meena.clay6

1 answer

Coulombs states that Force between charges is

asked Mar 20, 2019 by meena.clay6

1 answer

Expression for electric field at any point on axial line of electric dipole is

asked Mar 20, 2019 by meena.clay6

1 answer

Net flux through closed surface S is

asked Mar 20, 2019 by meena.clay6

1 answer

Explain the origin of spectral lines of hydrogen spectrum on basis of Bohr's theory.

asked Jul 20, 2017 by pady_1

2 answers

Obtain the relation for frequency of spectral lines emitted from hydrogen atoms.

asked Jul 20, 2017 by pady_1

1 answer

Calculate the energy level of an electron in $n^{th}$ orbit or derive an equation for the energy of

asked Jul 20, 2017 by pady_1

1 answer

<div>Explain the phenomenon of diffraction of light at a single slit to show the fringes of diffract

asked Jul 19, 2017 by pady_1

1 answer

<div>Explain polarisation by reflective. State and Prove Brewster's law.</div>

asked Jul 19, 2017 by pady_1

1 answer

Derive an expression for intensity at any point on the observation serem in the young’s double sli

asked Jul 19, 2017 by pady_1

1 answer

Explain the Eliminations reaction.

asked Jul 19, 2017 by pady_1

1 answer

What is meant by ‘disproportionation’ of an oxidation state? Give an example

asked Jul 19, 2017 by pady_1

1 answer

Give the Preparation of Potassium dichromate (K2Cr2O7)

asked Jul 19, 2017 by pady_1

1 answer

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