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Biology

General

Easy

Question

The graph given below represents the effect of sewage discharge on some important characteristics of river.

Select the correct option with respect to the peaks A and B.

Peak A – Sharp increase in BOD, disappearance of clean water organisms,
Peak A – Increase in dissolved oxygen, reappearance of clean water organisms,
Peak A – Sharp increase in BOD, appearance of clean water organisms,
Peak A – Increased number of anaerobic bacteria, disappearance of clean water organisms,

The correct answer is: Peak A – Sharp increase in BOD, disappearance of clean water organisms,

– Increase in dissolved oxygen, reappearance of clean water organisms.
Peak B – Sharp decline in dissolved oxygen, disappearance of clean water organisms.
Peak B – Increase in dissolved oxygen, disappearance of clean water organisms.
Peak B – Sharp decline is dissolved O₂, reappearance of clean water organisms.

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$L t subscript x not stretchy rightwards arrow a end subscript fraction numerator x sin a minus a sin x over denominator x minus a end fraction$

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The figure shows position of structures prior to digestion process

Consider the statements with reference to the diagram
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II) The process involves the coordinated activity of the tongue, soft palate, pharynx and oesophagus
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Consider the statements with reference to the diagram
I) The process will start as the bolus will be forced to move from oral cavity to pharynx
II) The process involves the coordinated activity of the tongue, soft palate, pharynx and oesophagus
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Identify the steps shown and choose the steps correctly describing the process from the above given statements.

See the figure given below carefully
Identify the histology of which part of alimentary canal is given in the figure by choosing correct option.

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