Foliose lichen stage - xerarch, Biology

Assignment Help:

Foliose Lichen Stage - Xerarch

As mentioned earlier, the weathering of the rocks and the decaying of the crustose lichens results in the formation of soil on the otherwise bare rocks. The foliose lichens make their appearance on such spots on the rocks which have accumulated some soil. These lichens include Dermatocarpon, Parmelia and Umbilicaria. These lichens have large, leaf-like thalli, which overlap the crustose lichens. The latter are thus cut-off from direct light. This results in death and decay of the crustose lichens.

The mass of foliaceous lichens can absorb and retain more water to some extent. Wind and water-borne dust particles are trapped by these lichens. This helps in the further building up of substratum. All these processes result in the accumulation of more and more humus. The rocks are weathered by the acids secreted by the living and the decaying plants. The weathering of the rocks and the rapid addition of humus to it result in the increase in thickness of soil layer. Thus, a considerable change in habitat is brought about.


Related Discussions:- Foliose lichen stage - xerarch

Determine indicators used in monitoring and surveillance, Determine Indicat...

Determine Indicators used in monitoring and surveillance? Various simple indicators may be used such as: 1) Weight-for-height 2) Body mass index (weight in kg/square of h

Define about the physical fitness, Define about the Physical Fitness? P...

Define about the Physical Fitness? Physical fitness is a general term we come across quite often and use it to describe an individual if he or she is able to carry out a variet

Use of computer in biotechnology, what are the uses of computer in biotechn...

what are the uses of computer in biotechnology ??? briefly explain any twenty

Ventricular arrhythmias-peri operative problems, Ventricular Arrhythmias : ...

Ventricular Arrhythmias :  These include premature ventricular contractions (PVC), ventricular tachycardia (VT) and ventricular fibrillation (VT). At times they may be respon

Why iodine is important for human body, Why Iodine is Important for Human B...

Why Iodine is Important for Human Body? Iodine is an essential constituent of the thyroid hormones: thyroxine (T 4 ) and triiodothyronine (T 3 ), which have a key role in growt

Cell, How cell divides?

How cell divides?

Dinoflagellates, Dinoflagellates are single-celled to colonial protistans ...

Dinoflagellates are single-celled to colonial protistans characterized by the two flagella, one girdling cell and the other trailing the cell. Some of the dinoflagellates exist in

Precaution - separation of amino acid by paper chromatogrphy, Define Precau...

Define Precaution for Separation of Amino Acids by Paper Chromatography? 1. Hold the paper with the extra strip kept at one side. Handling of whatman paper with hand should be

Dietary management of dyspepsia, Q. Dietary management of dyspepsia? Ke...

Q. Dietary management of dyspepsia? Keeping in mind the etiology, symptoms and complications of dyspepsia it must be clear that treatment and management of [his disorder does n

Explain the structure and functions of kidney, Explain the Structure and Fu...

Explain the Structure and Functions of Kidney You would have got a clear idea as to where the kidneys are situated. Yes, the kidneys are located in the posterior part of the ab

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