Dominant producers of neritic zone of sea are
Important Questions on Organisms and Populations
The following curves show the growth of two different species of bacteria G and H. They were cultured in Petri plates of two different sizes ( diameter and diameter) with of a similar nutrient media. (The lighter colour indicates the population in the smaller Petri plate.)
Which of the following would be true for the above experiment?
I. Species G has reached its carrying capacity
II. Species H has reached its carrying capacity
III. Species G is limited in its population by space
IV. Species H is limited in its population by space
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?
