Question

(a) What are lichens? Give two examples and one use of it?

(b) Name the excretory organs of following:

(i) Cockroach

(ii) Leech

Answer 1

a)Lichen is an organism formed by intimate association between a fungus & an alga..
Algae prepare food for fungi as it contains chlorophyll & fungi provides shelter to algae..
uses :it is used as an indicator(substances which show different colours in acid or base)
b)1.The excretory organ of cockroach is the malpighian tubules
    
2.Leech excretes through nephridia.


PLS MARK S BRAINLIEST

Answer 2

A lichen is not a single organism. Rather, it is a symbiosis between different organisms - a fungus and an alga or cyanobacterium. Cyanobacteria are sometimes still referred to as 'blue-green algae', though they are quite distinct from the algae. The non-fungal partner contains chlorophyll and is called the photobiont.
Evidence that lichens areexamples of successful symbiosis is the fact thatlichens can be found in almost every habitat and geographic area on the planet. Two species in two genera of green algae are found in over 35% of all lichens, but can only rarely be found living on their own outside of alichen.

Excretory organ in cockroach --malpighian tubules