Which element is responsible for causing soil salinity? At what concentration does the soil become saline?

While living in and on the host species, the animal parasite has evolved certain adaptations. Describe these adaptations with examples.

Do you agree that regional and local variations exist within each biome? Substantiate your answer with suitable example.

Does light factor affect the distribution of organisms? Write a brief note giving suitable examples of either plants or animals.

Give one example for each of the following:

i. Eurythermal plant species _______________

ii. A hot water spring organism _______________

iii. An organism seen in deep ocean trenches _______________

iv. An organism seen in compost pit _______________

v. A parasitic angiosperm _______________

vi. A stenothermal plant species _______________

vii. Soil organism _______________

viii. A benthic animal _______________

ix. Antifreeze compound seen in antarctic fish _______________

x. An organism which can conform _______________