91Ó°ÊÓ

Assertion: Mycorrhizae are association between fungi and roots of higher plants. Reason: Lichens represent mutualistic relationship between fungus and photosynthetic algae or cyanobacteria.

Assertion: Parasitism and predation are considered to be negative interactions. Reason : Parasites and predators limit the population of their host species.

Assertion: Cuscuta lost its chlorophyll and leaves in the course of evolution. Reason: Cuscuta is a total parasite.

Assertion: Parasite may reduce population density of its host. Reason: Parasite may reduce survival growth and reproduction of host.

Assertion: Kangaroo rat use minimal water for removal of excretory product. Reason: Kangaroo rat has the ability to concentrate urine.

Assertion: We maintain a constant body temperature to \(37^{\circ} \mathrm{C}\), in summer when outside temperature is more than our body temperature. Reason: We sweat profusely in summer, which brings down the body temperature.

Assertion: Desert lizards have physiological ability to main body temperature. Reason: Desert lizards are warm blooded animals.

Assertion: Population ecology, an important area of ecology. Reason: It links ecology to population genetics and evolution.

Assertion: Total number is not an easily adoptable measure for population size. Reason: If the population is huge and counting is impossible and time consuming.

Assertion: Female mosquito is not considered as parasite although it needs our blood for reproduction. Reason: Parasitism is aimed to obtain either food or shelter.