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Biology
13. Organisms and Populations
Home · Class 12 · Biology · Ref. Book · 13. Organisms and Populations
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Q14 of 70 Page 92

What is a tree line?

Tree line is an altitude beyond which no tree is seen.

Due to environmental conditions such as cold temperature, high altitude or lack of moisture the trees are not found beyond this line and if found show stunted growth or form low dense matted bushes. So beyond tree line only shrubs and hers are found.


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12

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.

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15

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

16

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Questions · 70
13. Organisms and Populations
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