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

What is the genetic code, What is the genetic code? Genetic code is the...

What is the genetic code? Genetic code is the key for the conversion of DNA nucleotide sequences (and therefore RNA nucleotide sequences) into amino acids sequences that will c

What do numeric pyramids represent?, What do numeric pyramids represent? ...

What do numeric pyramids represent? The Numeric pyramids represent the number of individuals in each trophic level of a food chain.

How do plants solve the problem of transporting substances, How do plants s...

How do plants solve the problem of transporting substances throughout their tissues? In bryophytes the substance transport is completed by diffusion. In tracheophytes (pteridop

Explain advantages and disadvantages of spread plate method, Explain Advant...

Explain Advantages and Disadvantages of Spread Plate Method? The advantages and disadvantages of spread plate method are highlighted next. Advantages   1. It is useful fo

Developmental disorders, DEVELOPMENTAL DISORDERS - 1 .      AMNIONITI...

DEVELOPMENTAL DISORDERS - 1 .      AMNIONITIS- Inflammation of amnion due to infection. 2 .      ABORTION- Escape of a embryo prior to the stage of viability (ab

Explain procedure for performing the completed coliform test, Explain Proce...

Explain Procedure for Performing the Completed Coliform Test? Completed test is the last step in the Coliform test procedure which is described herewith. Conduct the exercise f

Injection route - administration of drugs, Injection Route An injecti...

Injection Route An injection is an unpleasant experience for a person at any age and is particularly traumatic to the small child who often lives in fear to the next "need

Explain what is genetic factors, Explain what is Genetic Factors ? It h...

Explain what is Genetic Factors ? It has been suggested that certain genetic defect(s) could be partly responsible for increased risk of CAD in Asian Indians. No specific genet

Determine the bioavailability of minerals, Bioavailability of Minerals ...

Bioavailability of Minerals It is well known that the concentration of a nutrient in a food is not a reliable indicator of its nutritional value. In other words, the entire qua

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