Water plants provide ....... to water animals
$O_2$and food
Water and $CO_2$
Food and water
Shelter and shade
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 |
Which one of the following components of ecosystem comes from outside
Find an incorrect statement for $DFC$
Which one of the following system constitutes the primary producers
Mark the correct match