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प्रश्न
Define population growth. Explain different types of age pyramids.
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उत्तर
Definition: The increase in the size of a population or increase in number of individuals is known as population growth. When resources in the habitat are unlimited, population show exponential growth. When resources in the habitat are limited, it leads to competition between individuals for limited resources. This type of population growth is called logistic growth
Age distribution and Age pyramids:
- A population consists of individuals with different ages. The entire population is divided into three age groups - prereproductive (0-14 years), reproductive (age 15-44 years), post reproductive (45-85+years)The relative proportion of individuals of various age groups in the population is referred to as age structure of the population.
- If the age distribution (per cent individuals of a given age or age group) is plotted for the population, the resulting structure is called as age pyramid.
संबंधित प्रश्न
Select the statement which explains the best parasitism.
Name the type of association: Crow feeding the hatchling of Koel
What is population interaction? Explain the interactions in Mutualism and Competition.
Competition between species leads to ________.
Which one of the following pair does NOT show commensalism?
In a pond, we see plants which are free-floating; rooted–submerged; rooted emergent; rooted with floating leaves; Write the type of plant against the following examples.
| Plant Name | Type | |
| a. | Hydrilla | ______ |
| b. | Typha | ______ |
| c. | Nymphaea | ______ |
| d. | Lemna | ______ |
| e. | Vallisneria | ______ |
Observe the set of 4 figures A, B, C and D and, answer the following questions
- Which one of the figures shows mutualism?
- What kind of association is shown in D?
- Name the organisms and the association in C.
- What role is the insect performing in B?
 Fig. (A) |
 Fig. (B) |
 Fig. (C) |
 Fig. (D) |
Give one example for the following:
A parasitic angiosperm
Name any two categories of organisms that in general are adversely affected by competition.
In which interaction of species, both the species are at a loss?
