Question

17. In the biosphere, ecosystems may be classified on the basis of their nature, duration and size.
Accordingly they may be natural or artificial, temporary and permanent and small sized or large sized.
The various components of any ecosystem may be grouped in to biotic and a biotic component.
Recall this topic and answer the following questions-
(I) Which of the following is not a man made ecosystem?
(a).cropland
(b) pond
(c) garden
(d).aquarium
(II). Mark the decomposer out of the following:
(a).fungi of decay
(b).Bacteria
(c).Crow
(d).Both a and b
(III). Biotic components of an ecosystem include:
(a)producers
(b)consumers
(c) decomposers
(d)all of these
(IV) In a food chain, the third level is always occupied by
(a)carnivores
(b)herbivores
(c)decomposers
(d)producers​

Answer 1

Answer:

1 (b) pond

2(d) both a and b

3(d) all of these

4(a) carnivore