The first instance of construction of an artificial recombinant DNA molecule was carried out on the plasmid of:

Read the following passage carefully and answer the given questions.
The B-lymphocytes produce an army of proteins in response to pathogens. Each antibody molecule has four peptide chains, two small called light chains and two longer called heavy chains. Virus-infected cells secrete proteins called interferons which protect non-infected cells from further viral infection. Symptoms of allergic reactions include sneezing, watery eyes, running nose and difficulty in breathing. The use of drugs like anti-histamine, adrenalin and steroids quickly reduce the symptoms of allergy. Lymphoid organs are the organs where origin and/or maturation and proliferation of lymphocytes occur. The primary lymphoid organs are bone marrow and thymus. After maturation the lymphocytes migrate to secondary lymphoid organs like spleen, lymph nodes, tonsils, Peyer's patches of small intestine and appendix. Heroin commonly called smack is chemically diacetylmorphine which is a white, odourless, bitter crystalline compound. This is obtained by acetylation of morphine, which is extracted from the latex of poppy plant Papaver somniferum.
Which one of the following is not a feature of an antibody:

Identify the correct sequence of structures formed during spermatogenesis.
(A) Spermatozoa
(B) Secondary spermatocytes
(C) Spermatogonia
(D) Spermatids
Choose the correct answer from the options given below:

Match List - I with List - II.

List - I (Pathogen)	List - II (Disease)
(A) Wuchereria	(I) Typhoid
(B) Plasmodium	(II) Pneumonia
(C) Streptococcus	(III) Malaria
(D) Salmonella	(IV) Elephantiasis

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Amniocentesis is legally used to determine---
(A) Sex of the foetus
(B) Presence of genetic disorders
(C) Massive child immunization.
(D) Survivability of the fetus
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What does 'r' in equation dN/dt = rN (K-N / K) represent?

Arrange the following in order of their appearance, if a sperm starts travelling from testicular lobules?
(A) Urethra
(B) Vas deferens
(C) Urethral meatus
(D) Vasa efferentia
Choose the correct answer from the options given below:

Match List I with List II

LIST-I	LIST-II
A. \(\left[1 + \left(\frac{dy}{dx}\right)^2\right] = \frac{d^2y}{dx^2}\)	I. order 2, degree 3
B. \(\left(\frac{d^3y}{dx^3}\right)^2 - 3\frac{d^2y}{dx^2} + 2\left(\frac{dy}{dx}\right)^4 = y^4\)	II. order 2, degree 1
C. \(\left(\frac{dy}{dx}\right)^2 + \left(\frac{d^2y}{dx^2}\right)^3 = 0\)	III. order 1, degree 2
D. \(\left(\frac{dy}{dx}\right)^2 + 6y^3 = 0\)	IV. order 3, degree 2

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Arrange the following electromagnetic waves in the increasing order of their energy:
(A) infrared rays
(B) AM radio waves
(C) y - rays
(D) Microwaves
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Arrange the following groups of plants according to their appearance on earth.
(A) Angiosperms
(B) Seed ferns
(C) Rhynia type plants
(D) Psilophyton
Choose the correct answer from the options given below:

If \(x=4 t^2, y=8 t\), then \(\frac{d^2 y}{d x^2}\) is:

A plano-convex lens has focal length 0.5 m and the retractive index of the material of the lens is 1.5. The radius of curvature of the convex surface of the lens is

Oral contraceptive pills used by females, function through: