Study the Graph Given Below and Answer the Questions that Follow - Biology


Study the graph given below and answer the questions that follow :

(i) Write the status of food and space in the curves (a) and (b).
(ii) In the absence of predators, which one of the two curves would appropriately depict the prey population?
(iii) Time has been shown on X-axis and there is a parallel dotted line above it. Give the significance of this dotted line



(i) There is ample food and space for the population depicted by curve (a). When the resources are unlimited, the curve is exponential. There are limiting food and space for the population depicted by curve (b). When the resources are limiting, the curve becomes sigmoid.

(ii) In the absence of predators, curve (a) would appropriately depict the prey population.

(iii) The dotted line represents the carrying capacity of the environment. The carrying capacity represents the size of population that the environment can hold by providing necessary resources. When a population reaches this line its population size is stabilised by various environmental factors.

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2013-2014 (March) Delhi Set 1


Construct an age pyramid which reflects a stable growth status of human population.

How does an age pyramid for human population at given point of time helps the policy-makers in planning for future.

"Analysis of age-pyramids for human population can provide important inputs for long-term planning strategies." Explain.

What is an age-pyramid?

Define the Carrying capacity.

What is reproductive fitness? Explain it with the help of an example. 

Study the flow chart given below and complete the equation that follows by identifying 1, 2, 3 and 4.

Nt + 1 = Nt + {(1+ 2) − (3 + 4)}

Animals that can move from fresh water to sea called as ________.

Give an account of population regulation.

Measures of ‘Central tendency’ refer to:

Nutrient enrichment of water body result.

The phenomenal and rapid increase of population in a short period is called ______.

Population having large number of postreproductive and small number of prereproductive age group is called

`"dN"/"dt" = "rN" (("K"- "N")/"K")` in logistic growth "K" represents:

Age distribution in a population can influence

Label the three tiers 1, 2, 3 given in the above age pyramid.

Define ‘zero population growth rate’. Draw a age pyramid for the same.

List any four characters that are employed in human population census.

An individual and a population has certain characteristics. Name these attributes with definitions.

Given below is the Age Pyramid of the population in one of the states in India as per 2011 census. It depicts the male population on the left-hand side, female population on the right-hand side, newborns towards the base and gradually increasing age groups as we move from base to the top, with the oldest population at the top. Study this pyramid and comment upon the appropriateness of the Assertion and the Reason.

                              Percentage to the total population

Assertion: It is a stable population.

Reason: The pre-reproductive and reproductive individuals are almost in equal numbers and the post-reproductive individuals are relatively fewer.

Identify the type of pyramid given above. Write the identifying feature on the basis of which you identified it.

With the help of neatly labelled diagrams, explain the different types of age pyramids of human population.


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