What happens in anaerobic sludge digester?
(A) Anaerobic bacteria digest the bacteria and fungi in the sludge
(B) Aerobic bacteria digest the bacteria and fungi in the sludge
(C) Methane and Carbon dioxide is produced
(D) Methane and Nitrogen dioxide is produced
Choose the correct answer from the options given below :

What is the primary function of the aeration tanks in the secondary treatment of sewage?

Match List - I with List - II.

List - I	List - II
(A) Australian marsupials	(I) Homologous organs
(B) Wings of butterfly and wings of a bird	(II) Natural selection
(C) Industrial melanism	(III) Adaptive radiation
(D) Forelimbs of Horse and Bat	(IV) Analogous organs

Match List I with List - II.

List - 1	List - II
(A) Biocontrol agent	(I) Aphids
(B) Mycorrhiza	(II) Methanobacterium
(C) Ladybird	(III) Trichoderma
(D) Biogas	(IV) Glomus

Choose the correct answer from the options given below :

Microbes in human welfare Microbes are a very important component of life on earth. we use microbes and microbially derived products almost every day, like LAB to make curd, yeast to make bread, adding flavor and texture to cheese, producing antibiotics etc. The addition of LAB, improves the milk quality by increasing vit. B12. Cheese is one of the oldest food items in which microbes are used. For example, large holes in Swiss cheese are due to CO2 produced by the bacterium Propionibacterium sharmanii. The BOD test measures the rate of uptake of oxygen by microorganisms in a sample of water and thus, indirectly, BOD is a measure of the organic matter present in the water. The greater the BOD of waste water, the more is its polluting potential. In anaerobic sludge digesters, bacteria produce a mixture of gases like methane, hydrogen sulphide and carbon dioxide. These gases form biogas and can be used as a source of energy. Biofertilisers are organisms that enrich the nutrient quality of the soil. The main sources of biofertilisers are bacteria, fungi and cyanobacteria. You have studied about the nodules on the roots of leguminous plants formed by the symbiotic association of Rhizobium. These bacteria fix atmospheric nitrogen into organic forms, which is used by the plant as a nutrient. Other bacteria can fix atmospheric nitrogen while free-living in the soil (examples Azospirillum and Azotobacter).
In anaerobic sludge digesters, the biogas produced by the bacteria, is composed of -

Match List - I with List - II.

List I (Disease)	List ll (Causal organism)
(A) Pneumonia	(I) Protozoan
(B) Common cold	(II) Roundworm
(C) Malaria	(III) Bacteria
(D) Ascariasis	(IV) Virus

Choose the correct answer from the options given below:

The transfer of the ovum from a donor to the fallopian tube of another female is known as:

Identify the enzyme which is used for isolating genetic material from plant cells.

Progestasert and LNG-20 are examples of:

The system of equations
\(x+y+z=7\)
\(x+2 y+3 z=5\)
\(x+3 y+\lambda z=\mu\)
has a unique solution, if

Read the passage given below and answer the question.
Phenols and Alcohol have the same function group (-OH) but phenols are stronger acids than alcohol due the resonance stabilization of phenoxide ion than alkoxide ion (-RO\(^{-}\)). Electron withdrawing groups tend to increase the acidic strength while electron releasing groups tend to decrease it.
Which of the following reagent is used to distinguish between phenol and benzoic acid ?

Which one of the following is not a sexually transmitted infection?

A cell is prepared by dipping a Cu rod in \(1\ M\ CuSO_4\) solution and Sn rod in \(1\ M\ SnCl_2\) solution.
The standard electrode potential of Cu is \(+0.34\ V\) and Sn is \(-0.14\ V\). Emf of cell will be :