A : Lichens do not grow in polluted area having `SO_(2)`.
R : Lichens secrete carbonic acid and oxalic acid on barren rocks.

Lichen secrets which acids

Lichen secrets weak acids

Lichens secrete acid . . . . . On rocks

Lichens indicate SO_2 pollution because they

Mark True (T) or False(F) for the following statements & choose the correct option. Br (A) Phycobiont partner of lichens synthesises food for its other partner, br (B) Lichens do not grow in air polluted areas, br (C) Animals store their food reserve in the form of glycogen or fat

[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 .

[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 .