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Previous Year Question (PYQs)
1
Read the following passage and answer the
questions:
A Lichen is a composite organism that arises from
algae living among filaments of multiple fungi in a
symbiotic relationship. The combined lichen has
properties different from those of its component
organisms. Lichens come in many colours, sizes,
and forms. The properties are sometimes plant like,
but lichens are not plants. Lichens may have tiny
leafless branches, flat leaflike structures or flakes
that lie on the surface like peeling paint or other
growth forms.
Lichens occur from sea level to high alpine
elevations, in many environmental conditions and
can grow on almost any surface. Different kinds of
lichens have adopted to survive in some of the most
extreme environment on earth such as Arctic,
Tundra, hot dry deserts, rocky coasts, and toxic
slag heaps. They can even live inside solid rocks,
growing between the grains.
It is estimated that 6% of the earth’s land
surface is covered by lichens. Some of them are
considered to be the oldest living things. They are
among the first living things to grow on fresh rock
exposed after an event such as a land slide. The
long-life span and slow but regular growth rate of
some lichens can be used to date events.
The passage states all the following
about Lichens EXCEPT
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