Select and arrange the steps of gel electrophoresis in correct sequence.
(A) Separation of DNA fragments according to their size
(B) Staining of DNA with ethidium bromide
(C) Forcing DNA fragments to move towards anode
(D) Eluting the desired DNA fragments
(E) Visualisation under UV radiation
Choose the correct answer from the options given below:

Observe the illustration and answer the following question:

Meiotic division in primary oocytes is arrested at:

Which of the following microbes is not used as a biocontrol agent?

Match List I with List II

List I	List II
A. Commensalism	Balanus and Chthamalus
B. Mutualism	Mycorrhizae and legume plants
C. Parasitism	Cuscuta on hedge plants
D. Competition	Sea anemone and clownfish

Choose the correct answer from the options given below:

Read the passage carefully and answer the given questions.
Recombinant DNA Technology
Asexual reproduction preserves the genetic information, while sexual reproduction permits variation. Traditional hybridization procedures used in plants and animals breeding very often lead to inclusion and multiplication of undesirable genes along with the desired genes. The techniques of genetic engineering, which include creation of recombinant DNA, use of gene cloning and gene transfer, overcome this limitation and allow us to isolate and introduce only one or a set of desirable genes without introducing genes into the target organism.
In Recombinant DNA Technology, what is the role of the "selectable marker gene"?

Genes which code for a pair of contrasting traits are knows as:

In a given habitat during a given period of time, population density increases if :-

Arrange the following events of human embryo development in a correct sequence:
(A) Blastocyst formation
(B) Implantation
(C) Formation of morula
(D) Cleavage in zygote
Choose the correct answer from the options given below:

The large holes in 'Swiss Cheese' are due to the production of a large amount of CO2 by a bacterium named as

Let \(\vec{a}\) and \(\vec{b}\) be unit vectors. If \(\sqrt{3} \vec{a}-\vec{b}\) is a unit vector, then the angle between \(\vec{a}\) and \(\vec{b}\) is

In which ecosystem is the biomass of primary consumers greater than producers?

Which one of the following will show Tyndall effect ?

The rate constants of a reaction at 200 K and 300 K are \(0.02 s^{-1}\) and \(0.04 s^{-1}\). The activation energy ( \(E _{ a }\) ) for this reaction will be :