The species redundancy hypothesis suggests: 1) all species are important for the

Question

The species redundancy hypothesis suggests: 1) all species are important for the proper functioning of a community 2) species are not important 3) that loss of some species does not affect the function of a community 4) disturbances produce the largest number of species 5) time is an important factor influencing species number Which one of the following cycles is characterized by often being a limiting nutrient in ecosystems and having no atmospheric component in its cycle? 1) phosphorus 2) carbon 3) nitrogen 4) iron 5) water Even though nitrogen constitutes 78% of the Earth's atmosphere, the amount available for living things nearly all comes from 1) a few groups of nitrogen-fixing bacteria 2) the breakdown of minerals 3) a few genera of detritivores 4) the breakdown of dead plants 5) nitrogen-containing fertilizers

Explanation / Answer

Que 34.

Ans:

The species redundancy hypothesis suggests: 3) that loss of some species does not affect the function of a community.

Explanation:

- The loss of some species will not affect ecosystem stability.

- Because other species can expand their role and take up the functions vacated by the lost species.

- Hence, correct option is: 3).

Que 35.

Ans:

The cycle that is characterised by often being a limiting nutrient in ecosystems and having no atmospheric component in it's cycle is: 1) Phosphorus.

Explanation:

- A chemical nutrient such as phosphorus, which is necessary for growth but is found in limited quantities in a given ecosystem.

- Unlike many other biogeochemicals, the atmosphere does not play significant role in the movement of the phosphorus.

- Phosphorus normally occur in nature as parts of a phosphate ion.

- Hence, correct option is: 1)

Que 36.

Ans:

Even though nitrogen constitutes 78% of the Earth's atmosphere, the amount available for living things nearly all comes from: 1) a few groups of nitrogen fixing bacteria.

Explanation:

- The majority of the earth's atmosphere (about 78%) is composed of atmospheric nitrogen, but it is not in the form that is usable to living things.

- In order to use atmospheric nitrogen, it must be fixed or converted into ammonia.

- Nitrogen fixation is done by a few groups of nitrogen fixing bacteria.

- Hence, correct option is: 1).

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