Biosphere, Biology

Assignment Help:

Biosphere

Biosphere is that part of the earth where life can exist. It is a narfqy layer around the surface of the earth. If you visualise the earth to be the size of an apple the biosphere would be as thick as its skin. The biosphere extends from the floor of the ocean some 11,000 metres below the surface of the earth to the top of the highest mountains, or about 9,000 metres above the sea level. Its most densely populated region is just above and below the sea level.

Biosphere represents a highly integrated and interacting zone comprising of atmosphere (air), hydrosphere (water) and lithosphere (land) as you can see in Figure shown below.

2231_biosphere.jpg

Life inthe biosphere is abundant between 200 metres (660 feet) below the surface of the ocean and about 6,000 metres (20,000 feet) above sea level.

Biosphere is absent at extremes of the North and South poles, the highest mountains and the deepest oceans, since existing conditions there do not support life. Occasionally spores of fungi and bacteria do occur at great height beyond 9,000 metres, but they are not metabolically active, and hence represent only dormant life.

The energy required for the life within the biosphere comes from the sun. The nutrients necessaj for living organisms come from air, water and soil and not from outside. The same chemicals are recycled over and over again for life to continue. Living organisms are not uniformly distributed throughout the biosphere. Only a few organisms live in the polar regions, while the tropical rain forests have an exceedingly rich diversity of plants and animals.

 


Related Discussions:- Biosphere

Controlling introduction of alien species, Controlling Introduction of Alie...

Controlling Introduction of Alien Species As you know the alien species can cause the existing population to decrease or even become extinct. The individuals of alien species

Types of mode of nutrition, what is the mode of nutrition of fungi,bacteria...

what is the mode of nutrition of fungi,bacteria and man

What is posterior aneurysm? , What is  Posterior Aneurysm? The te...

What is  Posterior Aneurysm? The technique of Posterior Aneurysm operation is the same. Care must be taken to avoid injury to the posterior papillary muscle and poster

Explain doxycycline, Explain Doxycycline Doxycycline, which frequently c...

Explain Doxycycline Doxycycline, which frequently causes gastrointestinal disturbances and can cause photosensitivity and vaginitis, offers an inexpensive once-daily alternative

Differentiating causes of hypoxemia, Study and complete the following Mini ...

Study and complete the following Mini Clini: Differentiating Causes of Hypoxemia. Explain the pathophysiological mechanism of how the following disorders cause hypoxia: Pleu

What are target organs of the hormones, What are target organs of the hormo...

What are target organs of the hormones? Target organs, target tissues and target cells are those exact organs, tissues and cells upon which each hormone acts and makes its effe

Cells, true or false. the law of entropy says that all energy is ultimately...

true or false. the law of entropy says that all energy is ultimately derived from the sun

INVERTEBRATES - STRUCTURE & FUNCTION, 1. Write general characters of phylum...

1. Write general characters of phylum mollusca and classify it upto classes, giving at least two examples of each class.

Define absorption, Define Absorption, Storage and Elimination of Riboflavin...

Define Absorption, Storage and Elimination of Riboflavin? Riboflavin is absorbed from the small intestine through the portal vein and is passed to all tissues via general circu

CONNECTING LINKS, HOW SHOULD I PREPARE AN INVESTIGATORY REPORT ON CONNECTIN...

HOW SHOULD I PREPARE AN INVESTIGATORY REPORT ON CONNECTING LINKS AS AN EVIDENCE OF EVOLUTION

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd