Pollination in Ophrys (a mediterranean orchid) occurs by
Insect through clip mechanism
Insect through trap door mechanism
Insect through pseudocopulation mechanism
Insect through lever mechanism
Salinity of the soil is often caused due to
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$(I)$ | $(II)$ | $(III)$ |
$(a)$ $+$ | $(i)$ $-$ | $(P)$ Amensalism |
$(b)$ $-$ | $(ii)$ $-$ | $(Q)$ Commensalism |
$(c)$ $-$ | $(iii)$ $0$ | $(R)$ Predation |
$(d)$ $+$ | $(iv)$ $0$ | $(S)$ Competition |
In recent years, there has been an increasing incidence of floods in the plains of northern India because
July $11^{\text {th }}$ is observed as