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Lichens are called pioneer colonisers of...

Lichens are called pioneer colonisers of base rock. How can they help in formation of soil ?

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Lichens release chemical substances to break the rock into smaller, particles and hence make soil.
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Lichens are called pioneer colonisers of bare rock. How can they help in to formation of soil ?

Name the pioneer species on a bare rock. How do they help in establishing the next type of vegetation? Mention the type of climax community that will ultimately get established.

Read the following five statements (A to E) and select the option with all correct statement (A) Mosses and Lichens are the first organisms to colonise a bare rock. (B) Seloginella is a homosporous pteridophyte. (C) Coralloid roots in Cycas have VAM. (D) Main plant body in bryophytes is gametophytic whereas in pteridophytes it is sporophytic. (E) In Gymnoperms, male and female gametophytes are present within sporangla located on sporophyte.

a. Define corrosion. b. What is corrosion of iron called? c.Why corrosion of ironis a serious problem? d. How we can prevent corrosion of iron? e. How will you recognise the corrosion of silver? OR Why does silver turn blackish when exposed to air?

[A] : Lichens are of considerable ecological imporance as pioneers in colonization of rocky habitats by plants . [R] : The lichens excrete organic acids which disintegrate rocks , thus forming soil or substrata in which other kinds of plants become established .

Read the following five statements (A to E) and select the option with all correct statement (A) Mosses and Lichens are the first organisms to colonise a bare rock. (B) Seloginella is a homopourous pteridophyte. (C) Coralloid roots in Cycas have VAM. (D) Main plant body in bryophytes is gametophytic whereas in pteridophytes it is sporophytic. (E) In Gymnoperms, male and female gametophytes are present within sporangla located on sporophyte.

Lichens growing on rocks are called