Which of the following ecological pyramids is always upright?

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#Question id: 40207

#Environmental Science

Assertion (A): The pH of normal rain is considered to be exactly 7.0 (Neutral).

Reason (R): Carbon dioxide (CO2) in the atmosphere dissolves in raindrops to form weak carbonic acid.

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#Question id: 40208

#Environmental Science

Given below are two statements:

Statement I: Under the Environmental Impact Assessment (EIA) Notification 2006, "Category A" projects require clearance from the Central Government (MoEFCC).

Statement II: "Category B" projects do not require any Environmental Clearance from either State or Central authorities.

In light of the above statements, choose the correct answer:

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#Question id: 40209

#Applied Microbiology

The process by which ATP is synthesized using the energy released by the flow of protons (H⁺) across a membrane down their electrochemical gradient is known as:

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#Question id: 40210

#Applied Microbiology

Match the PCR step in Column I with the correct temperature range or characteristic in Column II.

Column I (PCR Step)	Column II (Condition / Event)
A. Denaturation	1. ∼72 °C; Optimum for Taq polymerase activity
B. Annealing	2. ∼94 °C; Hydrogen bonds break to separate DNA strands
C. Extension	3. ∼4 °C; Short-term storage after cycling
D. Final Hold	4. ∼50–65 °C; Primers bind to the template

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#Question id: 40211

#Environmental Science

 Match the scientists in List I with their proposed theories or experiments in List II.

List I (Scientists)	List II (Theories/Experiments)
A. A.I. Oparin & J.B.S. Haldane	I. Swan-necked flask experiment (Biogenesis)
B. S.L. Miller & H.C. Urey	II. Coacervate droplets (Chemical Evolution)
C. Louis Pasteur	III. Microspheres (Thermal synthesis of proteins)
D. Sidney Fox	IV. Simulation of primitive earth conditions

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#Question id: 40212

#Applied Microbiology

Read the following statements regarding the steps of a standard PCR cycle and choose the correct option.

Statement I: The denaturation step involves the breaking of phosphodiester bonds to separate the double-stranded DNA into single strands.

Statement II: The annealing temperature is usually set 3 -5 ⁰   C lower than the melting temperature (Tm) of the primers to ensure specific binding.