Match the following columns.
Column $- I$ | Column $- II$ |
$(a)$ Phytoplankton, grass | $(p)$ First trophic level |
$(b)$ Man, Lion | $(q)$ Herbivore |
$(c)$ Zooplankton, Cow, Grasshopper | $(r)$ Third trophic level |
$(d)$ Birds, Wolf | $(s)$ Top carnivore |
$a-p, b-q, c-r, d-s $
$a-s, b-r, c-q, d-p $
$a-p, b-r, c-q, d-s$
$a-p, b-s, c-q, d-r$
The phytoplankton in the ponds act as
Assertion : A network of food chains existing together in an ecosystem is known as food web.
Reason : An animal like kite cannot be a part of a food web.
In an ecosystem, the largest population is of
Why are oceans least productive ?
What do ecologists call the transfer of energy that begins with the sun and passes from one organism to the next in a food chain?