Some important events in the history of life on Earth are given below.

A. First dinosaurs appeared.

B. First reptiles appeared.

C. First insect fossils appeared.

D. First toothed birds appearance.

E. First wingless insect appeared.

F. Mammals like reptile arise

Match the above with the geological time periods and choose the correct combination,

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#Question id: 3017

#I Life Science/ Life Sciences Group – I-V

Biofilms

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#Question id: 8935

#SCPH06 I Botany

What may have occurred to prevent species that are of the same grade from also belonging to the same clade?

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#Question id: 10356

#SCPH05 I Biotechnology

Why the GS  and GOGAT is activated in light and while the AS is inhibited?

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#Question id: 13057

#SCPH01 Biochemistry

Precision will be reduced, but yield will be increased

Optimisation of a PCR reaction is often a compromise between the competing demands for precision, efficiency and yield. Although the specific effects may vary, generally, increasing the annealing temperature will increase non-specific primer binding and reduce precision. Increasing the length of the elongation phase will reduce the proportion of incomplete newly-synthesised strands and therefore increase yield. In this case, the potential effect on efficiency is unclear. Increasing the elongation phase would increase the reaction time, but the time taken to ramp down to a lower annealing temperature would be reduced.

How primer concentration leads to decrease in PCR efficiency?

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#Question id: 2659

#SCPH05 I Biotechnology

The correct option regarding the lac operon in E.coli from the following is