Directions: The following question has four choices out of which ONLY ONE is correct.

The vegetation found between the tree line and the snow line is called as

Bio-geochemical cycle of which element has atmospheric phase:

Which of the following pair is a sedimentary type of a biogeochemical cycle?

Which of the following is not true about biodiversity?

Which of the following is not a character of r-selected species?

When a forest that is destroyed by fire and again reoccupied by herbs in the initial stage is an example of

Which one of the following is not generally a features of shifting cultivation?

Choose the mismatch

The transfer of energy through a terrestrial ecosystem is often depicted by energy pyramids. Which one of the following statement is true?

The length of the food chain in an ecosystem is generally limited to 3 - 4 trophic levels because

Assertion(A): Farmen et al reported that from 1875 to 1985, a reduction of 40% to 50% of ozone content over Antarctica occured, reaching Southern New Zealand, Australia and Southern America. Reasoning (R): Ozone layer thinning in the stratosphere directly influences the increase in global warming.

Which of the following statements is/are not true about the nitrogen cycle? A. Biological nitrogen fixation amounts to more than 60% of the annual total fixation. B. Nitrogen fixation is achieved industrially by Haber Bosch process. C. Nitrification involves the reduction of nitrogen compounds. D. Decomposers carry out deamination resulting in the release of nitrogen. E. Nitrosomonas reduces ammonia to nitrites.

The interbreeding organisms in a species showing continuous distribution form

Which of the following statements is/are false? P. genetic diversity helps prevent a species from becoming extinct Q. the phenomenon in which animals with favorable adaptation reproduce more rapidly is called differential reproduction R. geographic isolation is a common mechanism contributing to speciation S. biologists estimate that 99% of all the species that have ever existed are now extinct

The role of decomposers in nitrogen cycle is to