MEDIUM
Earn 100

Which of these countries is NOT a member of ASEAN?

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Important Questions on Current Electricity

HARD
Differentiate between an ‘Expanding age pyramid’ and a ‘Stable age pyramid’. Substantiate your answer with diagrams.
 
HARD
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
EASY
If 8 individuals in a population of 80 butterflies die in a week, calculate the death rate of population of butterflies during that period.
HARD
Explain Commensalism and mutualism with examples
HARD
Analyse the effects of ‘Alien species invasion’ on the biodiversity  of  a given area. Provide two examples.
 
MEDIUM
Explain the difference between commensalism and mutualism types of interactions, with the help of a suitable example of each.
HARD
State two observations made by the German naturalist, Alexander von Humboldt during his extensive explorations in South American Jungles.
EASY
Give two points of differences between electrochemical and electrolytic cells.
MEDIUM
Explain any two reasons which causes the losses of biodiversity.
EASY
An association of individuals of different species living in the same habitat and having functional interactions is:
EASY
In which of the following both pairs have correct combination?
HARD
Write the difference between genetic biodiversity and species biodiversity that exists at all the levels of biological organisations.
EASY
How many hotspots of biodiversity in the World have been identified till now? 
MEDIUM

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? 

EASY
The principle of competitive exclusion was stated by
MEDIUM
"India has greater ecosystem diversity than Norway." Do you agree with this statement? Give reasons in support of your answer.
EASY

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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EASY
A battery, an open switch and a resistor are connected in series as shown in figure. Consider the following three statements concerning the circuit. A voltmeter will read zero if it is connected across points
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(i) P and T (ii) P and Q (iii) Q and T
Which one of the above is/are true?