MCQ
Black rust of wheat is caused by
- ✓Puccinia graminis
- BUstilago
- CPythium
- DNone of these
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$I.$ Charles Elton developed the concept of ecological pyramid
$II.$ After the name these pyramids are also called as Eltonian pyramids
$III.$ It is a graphical representation or pyramid shaped diagram which depicts the number of organisms, biomass and energy at each trophic level
Which of the statements given above are correct?
$I.$ $pH$ of soil
$II.$ mineral composition of the soil
$III.$ water holding capacity of soil
$IV.$ weather condition
Choose the correct option