Which one of the followings would increase population density after certain time?

The gene encoding resistance to which antibiotic are considered useful selectable marker for E. coli.
(A) ampicillin
(B) tetracycline
(C) kanamycin
(D) penicillin
(E) chloramphenicol
Choose the correct answer from the options given below :

Read the passage carefully and give the answers to the question :
India was amongst the first countries in the world to initiate action plans and programmes at a national level to attain total reproductive health as a social goal.
These programmes called 'family planning' were initiated in 1951 and were periodically assessed over the past decades. Improved programmes covering wider reproduction-related areas are currently in operation. Creating awareness among the people about various reproduction-related aspects and providing facilities and support for building up a reproductively healthy society are the major tasks under these programmes.
Which of the following is not a Sexually Transmitted Disease?

The vector through which dengue and chikungunya spread is:

Sporopollenin, the most resistant organic material is present in:

Which one of the following statements is correct about Saccharomyces cerevisiae?

Which of the following is/are not the factor(s) causing the poor health of a person?
(A) Genetic disorders
(B) Infections
(C) Intake of unbalanced diet and un-clean water
(D) Having good eating habits
Choose the correct answer from the options given below:

The values of ' \(a\) ' and ' \(b\) ' if the equation of straight line trend by least square method is given by \(y=a+b x\) such that \(\sum x=0, \sum y=84, \sum x y=108, \sum x^2=70\) for 6 observation as are :

Let functions \(f:\{1,3,4\} \rightarrow\{1,2,5\}\) and \(g:\{1,2,5\} \rightarrow\{1,3\}\) be defined as \(f=\{(1,2),(3,5),(4,1)\}\) and \(g=\{(1,3),(2,3),(5,1)\}\) respectively. Then, which one of the following is correct statement for \(g \circ f\)?

If a p-n junction is forward biased, then what is the direction of diffusion and drift current across the junction?

By increasing the temperature, the specific resistance of a conductor and a semiconductor

The IUPAC name of the following compound is

Area lying in the first quadrant and bounded by the circle \(x^2+y^2=4\) and the lines x = 0 and x = 2 is: