During allergic reactions, which of the followings are secreted?
(A) Histamines
(B) Interferons
(C) Serotonin
(D) Pyrogens
Choose the correct answer from the options given below:

The density of population is decreased by the processes
(A) Natality
(B) Emigration
(C) Mortality
(D) Immigration
Choose the most appropriate combination from the options given below.

How many episodes of mass extinctions of species have occurred on earth since the origin and diversification of life?

Arrange the steps of Polymerase chain reaction in proper sequence-
A. Selection of desired fragment of DNA
B. Annealing
C. Amplification
D. Extension
E. Denaturation
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.
What is the purpose of using a gene promoter in recombinant DNA technology?

Identify the hormone releasing IUDs -

The pioneer species of primary succession in water are:

An inverted pyramid of biomass can be found in:

The area bounded by the curve \(y=x^2\) between \(x=0\) and \(x=\pi\), in the first quadrant is :

Match List - I with List - II.

List - I	List - II
(A) Oxalic acid	(I) Hexane-1,6-dioic acid
(B) Acetophenone	(II)Ethane-1,2-dioic acid
(C) Phthalic acid	(III) Benzene-1,2-dicarboxylic acid
(D) Adipic acid	(IV) \(\Delta T_b=k_b m\)

Choose the correct answer from the options given below :

Identify the optically active compounds from the following:
(A) \(\left[ Co ( en )_3\right]^{3+}\)
(B) trans \(-\left[ Co ( en )_2 Cl _2\right]^{+}\)
(C) cis- \(\left[ Co ( en )_2 Cl _2\right]^{+}\)
(D) \(\left[ Cr \left( NH _8\right)_5 Cl \right]\)
Choose the correct answer from the options given below:

Inactive protoxins is converted into its active toxin by:

The light rays travel from a glass slab with refractive index \( \mu_1 \) to the second slab with refractive index \( \mu_2 \). The refractive index of the second slab with respect to the first one is: (Assume that the two slabs have the same thickness)