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प्रश्न
Comment on the following figures: 1, 2 and 3:
A, B, C. D, G, P, Q, R, S are species
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उत्तर
Fig. 1: It is a single population and all individuals are of the same species, i.e. A - Individual interact among themselves and their environment.
Fig. 2: It is a community and it contains three populations of species A, B and C. They interact with each other and their environment.
Fig. 3: It is a biome. It contains three communities of which one is in climax and other two are in different stages of development. All three communities are in the same environment and they interact with each other and their environment.
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संबंधित प्रश्न
(a) Name the two growth models that represent population growth and draw the respective growth curves they represent.
(b) State the basics for the difference in the shape of these curves
(c) Which one of the curves represents the human population growth at present? Do you think such a curve is sustainable? Give reason in support of your answer.
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
Represent diagrammatically three kinds of age-pyramids for human populations.
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.
List the attributes that populations but not individuals possess.
If a population growing exponentially double in size in 3 years, what is the intrinsic rate of increase (r) of the population?
Define the carrying capacity.
What is reproductive fitness? Explain it with the help of an example.
Answer the following question.
"The size of a population for any species is not a static parameter." Justify the statement with specific reference to fluctuations in the population density of a region in a given period of time.
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)}
Give an account of population regulation.
Nutrient enrichment of water body result.
Which of the following would necessarily decrease the density of a population in a given habitat?
Which one of the following organisms reproduces sexually only once in its lifetime?
The density of a population in a habitat per unit area is measured in different units. Write the unit of measurement against the following:
Fish
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.
What would be the best method to measure the total population density of a dense bacterial culture in a petridish and why?
Important attributes belonging to a population but not to an individual are:
- Birth rate and death rate
- Male and female
- Birth and death
- Sex-ratio
Select the correct option from the given options:
The number of lily plants in a pond was found to be 50. After one year, the number. increased to 65. Calculate the natality of lily plants.
