Alluvial soil is a type of
Important Questions on Organisms and Populations
Spirodela polyrhiza and Lemna gibba are two small monocotyledons, which lies flat on the surface of quiet fresh water bodies. When these were grown in nutrient culture media, the following data were obtained.
The type of interaction between the two species is most likely to be
On the african plain, large herbivores like black rhinoceros disturb insect communities as they move. Birds like cattie egret feeds on the displaced insects. Neither the displacement of insects nor the activity of birds has any effect on the rhino. Oxpecker (a small dark bird) removes ticks from the skin of the rhino. The bird gets food & the mammals get relief from parasites.
An outline of these inter-relief from parasites. Match the alphabets with the relationship that the organisms possess among themselves and then write only appropriate number in the space against each alphabet.
The accompanying graph depicts the relationship between environmental impact (E), world population (P), average standard of living (L) and world resources (R). What is expected, if the world population remains stable but the average standard of living continues to increase?
A researcher clips pinnae of 20 rabbits trapped in a section of forest and released them. After a fortnight he traps 28 rabbits in the same section of forest and notices 4 of them with clipped pinnae. His estimate of rabbit population in the sector of the forest should be:
If "K is the carrying capacity of the habitat, 'N' is the total number of individuals in a population with intrinsic rate of reproduction as Y, the growth rate of such a population will be directly proportional to:
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