Recent questions tagged ch15

<div>How can you, as an individual , prevent the loss of biodiversity?</div><div>We as individuals c

asked Jul 20, 2017 by pady_1

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<div>Species diversity decreases as we move away from the equator towards the poles. What could be t

asked Jul 12, 2017 by pady_1

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<div>Though the conflict between the humans and wildlife started with the evolution of man, the inte

asked Jul 12, 2017 by pady_1

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Elaborate how invasion of alien species reduces the species diversity of an area?

asked Jul 12, 2017 by pady_1

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What is co-extinction? Explain with a suitable example.

asked Jul 12, 2017 by pady_1

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What are sacred groves and their role in biodiversity conservation?

asked Jul 12, 2017 by pady_1

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Humans benefit from diversity of life. Give two examples.

asked Jul 12, 2017 by pady_1

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What criteria should one use in categorizing a species as threatened?

asked Jul 12, 2017 by pady_1

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Can you think of a scientific explanation, besides analogy used by Paul Ehrlich, for the direct rela

asked Jul 11, 2017 by pady_1

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There is a greater biodiversity in tropical/sub tropical regions than in temperate regions. Explain.

asked Jul 11, 2017 by pady_1

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What characteristics make a community stable?

asked Jul 11, 2017 by pady_1

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Is it true that there is more solar energy available in the tropics? Explain briefly.

asked Jul 11, 2017 by pady_1

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Is it possible that productivity and diversity of natural communities remain constant over a time of

asked Jul 11, 2017 by pady_1

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Define the terms (i) Bioprospecting (ii) Endemism

asked Jul 11, 2017 by pady_1

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Why is genetic variation important in the plant Rauwolfia vomitoria?

asked Jul 11, 2017 by pady_1

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Explain as to how protection of biodiversity hot spots alone can reduce upto 30% of the current rate

asked Jul 11, 2017 by pady_1

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What accounts for the greater ecological diversity of India?

asked Jul 11, 2017 by pady_1

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How is presently occurring species extinction different from earlier mass extinctions?

asked Jul 11, 2017 by pady_1

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Suggest a place where one can go to study coral reefs, mangrove vegetation and estuaries. 

asked Jul 11, 2017 by pady_1

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List any two major causes other than anthropogenic causes of the loss of biodiversity. 

asked Jul 11, 2017 by pady_1

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What is the expanded form of IUCN? 

asked Jul 11, 2017 by pady_1

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What does the term 'frugivorous' mean?

asked Jul 11, 2017 by pady_1

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Define gene pool.

asked Jul 11, 2017 by pady_1

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What does 'Red' indicate in the IUCN red list (2004)? 

asked Jul 11, 2017 by pady_1

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An AM transmitter records an antenna current of $10.5\;A$ . The antenna current drops to $10\;A$ when only carrier is transmitted. What is the percentage modulation ?

asked Oct 3, 2016 by meena.p

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When a broad cast AM transmitter is $50\%$ modulated its antenna current is $12\;A$ . What would be the carrier current ?

asked Oct 3, 2016 by meena.p

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If $V_r$ is velocity of red light and $V_b$ is the velocity of blue light in vacuum, then

asked Oct 3, 2016 by meena.p

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The TV transmission tower in Delhi has a height of $340\;m$ . The distance up to which the broad cost can received , (taking the radius of earth to be $6.4 \times 10^{6}m)$ is

asked Oct 3, 2016 by meena.p

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Refractive index of ionosphere is

asked Oct 3, 2016 by meena.p

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The electro magnetic waves of frequency $2\; MHz$ to $30\;MHz$ are used

asked Oct 3, 2016 by meena.p

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Which of the following frequencies will be suitable for beyond the horizon communication ?

asked Oct 3, 2016 by meena.p

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A radio station has two channels . One is AM at $1020\;KHz$ and the other FM at $89.5\;MHZ$ For good result you will use

asked Oct 3, 2016 by meena.p

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LANDSAT series of satellite move in near polar orbits at an attitude of

asked Oct 3, 2016 by meena.p

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The sky wave with a frequency of $50\;MHz$ is incident on D- region at an angle of $30^{\circ}$ then angle of refraction is

asked Oct 3, 2016 by meena.p

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When radio waves passes through ionosphere , phase difference between space current and captive displacement current is .

asked Oct 3, 2016 by meena.p

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Modem is a device which perform

asked Oct 3, 2016 by meena.p

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Calculate the phase velocity of electro magnetic wave having electron density and frequency for D layer , $N = 400\; electron /cc, \nu = 300\;kHz$

asked Oct 3, 2016 by meena.p

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The maximum range of ground or surface wave propagation depends on

asked Oct 3, 2016 by meena.p

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Calculate the length of half wave dipole antenna at $300\;MHz$

asked Oct 3, 2016 by meena.p

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A 400 watt carrier is modulated to a depth of $75\%$ . calculate the total power in the modulated wave .

asked Oct 3, 2016 by meena.p

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A broad cast AM transmitter radiates $50 \;kw$ of carrier power . What will be the radiated power at $85 \%$ modulation ?

asked Oct 3, 2016 by meena.p

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A T.V tower has a height of 100 m , How much population is covered by the T.V broad cast if the average population density around the town is $5000 \;km^{-2}$?

asked Oct 3, 2016 by meena.p

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Out of the following which is not an essential element of a communication system ?

asked Sep 30, 2016 by meena.p

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A repeater is a combination of

asked Sep 30, 2016 by meena.p

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If $\lambda$ is wave length of radio signals to be transmitted , then the length of Hertz antenna is

asked Sep 30, 2016 by meena.p

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Line of sight propagation is

asked Sep 30, 2016 by meena.p

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The correct radiation between plasma frequency $\nu$ of a radio wave length and electron density N of the ionosphere

asked Sep 30, 2016 by meena.p

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Sky wave propagation is also called

asked Sep 30, 2016 by meena.p

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What is the value of frequency at which an e.m wave must be propagated for the D- region to have a refractive index of $0.49 $ Electron density for D- layer is $10^9m^{-3}$

asked Sep 30, 2016 by meena.p

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A T.V transmission town antenna is at a height of 20 m . How much service area can it cover if the receiving antenna at a height of 25 m

asked Sep 30, 2016 by meena.p

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