Which of the following is a free living soil nitrogen fixing bacteria ?

The rate of biomass production is called productivity and it is expressed in terms of:

In a typical test cross:

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).
BOD refers to the -

Write the correct sequence of events performed in DNA fingerprinting technique
A. Isolation of DNA
B. Separation of DNA fragments by electrophoresis
C. Digestion of DNA using restriction endonucleases.
D. Transfer of seperated DNA fragments to synthetic membrane
Choose the correct answer from the options given below:

Read the passage carefully and answer the given questions. DNA Fingerprinting
Polymorphism in DNA sequence is the basis of genetic mapping of the human genome as well as of DNA fingerprinting. DNA fingerprinting involves identification of differences in some specific regions in the DNA sequence called repetitive DNA. It works on the principle of polymorphisms in DNA sequences. The repetitive DNA are separated from bulk genomic DNA. The bulk DNA forms a major peak and the other small peaks are referred to as satellite DNA. These repetitive/satellite DNA sequences show a high degree of polymorphisms and form the basis of DNA fingerprinting.
Variable Number of Tandem Repeats are -

Arrange the following steps of Polymerase Chain Reaction in proper sequence.
(A) Amplification of DNA
(B) Annealing of primer
(C) Extension of primer
(D) Denaturation of ds DNA
Choose the correct answer from the options given below:

The compounds\([\text{CuSO}_4(\text{NH}_3)_2]\text{Br}_2\)and\([\text{Cu}(\text{NH}_3)_2\text{Br}_2]\text{SO}_4\) are:

The introduction of dielectric slab between the capacitor plates increase its capacitance due to

The area of the region bounded by the parabola \(y^2=4 a x\) and its latus rectum is:

A battery of emf 12 V and internal resistance 3 \( \Omega \) is connected to an external resistor R. If the current in the circuit is 0.6 A, the voltage across the external resistor will be

A boat 10 m high floating at a uniform speed of 13 meters per minute \(( m / min )\) away from a lamp post 15 m high.
Then the rate at which the length of shadow of the boat increases is :

Identify the correct statements.
(A) The density of nuclear matter is independent of the size of the nucleus.
(B) Nuclear forces are charge independent and are non-central forces.
(C) The nuclides having the same mass number are called isotones.
(D) The mass of a nucleus can be less or more than the sum of the masses of nucleons present inside it.
Choose the correct answer from the options given below: