Arrange the given steps for sewage treatment plant in correct sequence?
(A) Formation of flocs
(B) Pumping of sludge into anaerobic sludge digester
(C) Filtration and sedimentation
(D) Reduction in BOD by biological treatment
Choose the correct answer from the options given below:

Read the following passage carefully and answer the given questions.
Bioactive molecule, cyclosporin A, that is used as an immunosuppressive agent in organ-transplant patients, is produced by the fungus Trichoderma polysporum. Statins produced by the yeast Monascus purpureus have been commercialised as blood-cholesterol lowering agents. It acts by competitively inhibiting the enzyme responsible for synthesis of cholesterol. Baculoviruses are pathogens that attack insects and other arthropods. The majority of baculoviruses used as biological control agents are in the genus Nucleopolyhedrovirus. These viruses are excellent candidates for species-specific, narrow spectrum insecticidal applications. They have been shown to have no negative impacts on plants, mammals, birds, fish or even on non-target insects. BOD refers to the amount of the oxygen that would be consumed if all the organic matter in one liter of water were oxidised by bacteria. The sewage water is treated till the BOD is reduced. Cheese, is one of the oldest food items in which microbes were used. Different varieties of cheese are known by their characteristic texture, flavour and taste. For example, the large holes in 'Swiss cheese' are due to production of a large amount of CO₂ by a bacterium named Propionibacterium sharmanii.
Baculoviruses are-

Verhulst-Pearl logistic growth equation can be represented by -

Read the given passage and answer the following questions:
Secondary treatment or biological treatment: The primary effluent is passed into large tanks where air is pumped into it. This allows vigorous growth of aerobic microbes. While growing, these microbes consume the major part of the organic matter in the effluent. This significantly change the BOD (biochemical oxygen demand) of the effluent. The effluent in then passed into a tank a small part of the sludge is pumped back into the aeration tank to serve as the inoculum. The remaining major part of the sludge is pumped into large tanks called sludge digesters. Here, other kinds of bacteria grow anaerobically in the sludge. The biogas produced can be used source of energy as it is inflammable. The effluent from the secondary treatment plant is generally released into natural water bodies like rivers and streams.
The biogas is a mixture of the following gases

Which one of the following human ancestors probably lived in East African grasslands two million years ago?

Which of the following is a man-made ecosystem?

Read the paragraph given below and answer the question.
Insulin used for diabetes was earlier extracted from slaughtered cattle and pigs. Insulin from an animal source, though caused some patients to develop allergy or other type of reactions. Insulin consists of two short polypeptide chains: chain A and chain B, that are linked bridges. In mammals, including human, insulin is synthesised as a pro-hormone.
Insulin is synthesised as in mammals.

A first order reaction is found to have rate constant, \(k=3.5 \times 10^{-4} s^{-1}\). It's half life will be :

Which of the following ecosystem is most productive in terms of net primary productivity?

Which of the radiation of sun light is used as heat energy?

The point estimate of the population standard deviation for the random sample \(5,8,10,7,10,14\) is :

Consider the following test:
\(H _0: \mu \leq 12\)
\(H _{ a }: \mu>12\)
A sample of 36 provided a sample mean \(\bar{x}\) = 16 and a sample standard deviation S = 4.2 Then the value of the t-test statistic is:

The gene controlling the ABO blood groups in humans is :