Mutualism is found in

• hermit crab and sea anemone

• ox pecker and rhinoceros

• zoochlorellae and Hydra

• E.coli and man

Fasciola hepatica (liver fluke) infects its intermediate host and primary host at the following larval stages respectively

• redia and miracidium

• cercaria and redia

• cercaria and metacercaria

• miracidium and metacercaria

Euryhaline species denotes an animal

• without osmoregulation

• which lives in saline water

• which has a wide range of saline tolerance

• which has a wide range of temperature tolerance

On high mountains, difficulty in breathing is due to :

• decrease in partial pressure of O₂

• decrease in amount of O₂

• increase in CO₂ conc

• all of the above

The resting state of reptiles in winter is

• hibernation

• aestivation

• diapause

• moulting

Interbreeding population of animals is called :

• sub-species

• species

• community

• genus

Population means

• all the animals of a place

• all the animals and plants found in an area

• human beings in an area

• animal/plants of a species living in a specific area

Assertion : Lateral line system is found in fishes and aquatic larval amphibians.

Reason : Lateral line system has receptors which are the clusters of sensory cells derived from ectoderm.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both the assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both the assertion and reason are false.

Given below is the survivorship curve of different population.

Which type of the curve has the highest chances of senescence affecting mortality?

• Type I

• Type I and II

• Type III

• Type I, II and III

Which of the following rule states that Avian and mammalian forms are generally of higher size in colder region as compared to warmer region'?

• Bergmann's rule

• Allen rule

• Gloger rule

• Hardy-Weinberg rule