The following graph depicts changes in two populations (A and B) of herbivores in a grassy field. A possible reason for these changes is that [2015]
population A produced more offspring than population B
population A consumed the members of population B
both plant populations in this habitat decreased
population B competed more successfully for food than population A
(4)
Both the populations are herbivorous, thus they cannot affect each other. If the food sources for these populations A and B have decreased, then both the populations A and B would have declined. If population A have produced more offspring then the graph A should have increased. Based on the graph, population B is more successful in competing with population A, that is why number of organisms in population B increased while that in population A decreased, as they get access to limited resources.
Epiphytes that are growing on a mango branch is an example of which of the following? [2025]
Commensalism
Mutualism
Predation
Amensalism
(1)
Commensalism is the type of interaction in which one-species benefits and another is neither harmed nor benefited. An orchid growing as an epiphyte on a mango branch is an example of commensalism.
Given below are two statements : [2025]
Statement I : Fig fruit is a non-vegetarian fruit as it has enclosed fig wasps in it.
Statement II : Fig wasp and fig tree exhibit mutual relationship as fig wasp completes its life cycle in fig fruit and fig fruit gets pollinated by fig wasp.
In the light of the above statements, choose the most appropriate answer from the options given below :
Both statement I and statement II are correct
Both statement I and statement II are incorrect
Statement I is correct but statement II is incorrect
Statement I is incorrect but statement II is correct
(2)
Fig fruit is a vegetarian fruit as it only gets pollinated by wasp. Fig tree and fig wasps shows mutualism in which both species are benefitted. So, statement I is incorrect. Statement II is also not correct as fig inflorescence/flower gets pollinated by fig wasp.
Which one of the following equations represents the Verhulst-Pearl Logistic Growth of population? [2025]
(2)
Logistic growth is described by Verhulst-Pearl logistic growth equation
