Q10 of 70 Page 92


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


b. What type of population growth is represented by the above age pyramid?


(a) The three tiers represent:

Tier 1: Pre-reproductive population


Tier 2: Reproductive population


Tier 3: Post Reproductive population


(b) The pyramid represents growing or expanding population as the pre-reproductive and reproductive population is growing.


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8

In a pond, we see plants which are free-floating; rooted–submerged; rooted emergent; rooted with floating leaves. Write the type of plants against each of them.

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The density of a population in a habitat per unit area is measured in different units. Write the unit of measurement against the following:

a. Bacteria _______________


b. Banyan _______________


c. Deer _______________


d. Fish _______________


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In an association of two animal species, one is a termite which feeds on wood and the other is a protozoan Trichonympha present in the gut of the termite. What type of association they establish?

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Lianas are vascular plants rooted in the ground and maintain erectness of their stem by making use of other trees for support. They do not maintain direct relation with those trees. Discuss the type of association the lianas have with the trees.