Which of the following does NOT serve as biofertilizer in paddy field?

Genetically modified crops have advantages over normal crops as they are:
(A) More tolerant to cold, drought, salt and heat
(B) Less efficient in mineral usage
(C) Less reliant on chemical pesticides
(D) Nutritionally enriched
Choose the correct answer from the options given below :

In angiosperms, the outer wall of ovary develops into :

Read the given paragraph carefully and answer the following questions:
Since the DNA is enclosed within the membranes, we have to break the cell open to release DNA along with other macromolecules such as RNA, proteins, polysaccharides and also lipids. This can be achieved by treating the bacterial cells/plant or animal tissue with enzymes such as lysozyme (bacteria), cellulase (plant cells), chitinase (fungus). There are some basic steps in genetically modifying an organism (i) identification of DNA with desirable genes; (ii) introduction of the identified DNA into the host; (iii) maintenance of introduced DNA in the host and transfer of the DNA to its progeny. Agrobacterium tumifaciens, a pathogen of several dicot plants is able to deliver a piece of DNA known as 'T-DNA' to transform normal plant cells into a tumor and direct these tumor cells to produce the chemicals required by the pathogen. Other molecules can be removed by appropriate treatments and purified DNA ultimately precipitates out after the addition of chilled ethanol. Selection of recombinants due to inactivation of antibiotics is a cumbersome procedure because it requires simultaneous plating on two plates having different antibiotics. Therefore, alternative selectable markers have been developed which differentiate recombinants from non-recombinants on the basis of their ability to produce colour in the presence of a chromogenic substrate. In this, a recombinant DNA is inserted within the coding sequence of an enzyme, ß-galactosidase. This results into inactivation of the gene for synthesis of this enzyme, which is referred to as insertional inactivation.
Which enzyme is not used to lyse the cells for extraction of DNA?

If in a pond there were 20 lotus plants last year and through reproduction 8 new plants are added, taking the current population to 28, then the birth rate will be -

"Match List-l with List-ll

List-l (Terms)	List-II (Features)
(A). Amniocentesis	(I). Maternal mortality rate
(B). MMR	(II). Surgical method of contraception
(C). Periodic abstinence	(III). Process to test genetic disorders in foetus
(D). Vasectomy	(IV). Natural method of contraception

Choose the correct answer from the options given below: "

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:

The particular solution of the differential equation \(\frac{d y}{d x}=e^{x^2 / 2}+x y\), when \(x = 0\), \(y = 1\) is

Arrange the given species in correct trophic levels in a grassland ecosystem?
(A) Crow
(B) Vulture
(C) Rabbit
(D) Grass
Choose the correct answer from the options given below:

Two identical short magnetic dipoles of magnetic moment \( 2 \text{ Am}^2 \) are placed with their axis mutually perpendicular and centers 2 m apart. The magnitude of the resultant magnetic field at the midpoint (O) between the dipoles is :

The function \(f(x)=\left\{\begin{array}{ll}\frac{|x|}{x}, & \text { if } x \neq 0 \\ 0, & \text { if } x=0\end{array}\right.\) is:

If A and B are two matrices of order \(4 \times m\) and \(4 \times n\), respectively and \(m=n\),
then the order of matrix \((5 A-2 B)\) is:

Read the following passage carefully and answer the given questions.
Immune System in the Body
The human immune system consists of lymphoid organs, tissues, cells and soluble molecules like antibodies. The primary lymphoid organs are bone marrow and thymus where immature lymphocytes differentiate into antigen-sensitive lymphocytes. After maturation the lymphocytes migrate to secondary lymphoid organs like spleen, lymph nodes, tonsils, Peyer's patches of small intestine and appendix. The secondary lymphoid organs provide the sites for interaction of lymphocytes with the antigen, which then proliferate to become effector cells. The bone marrow is the main lymphoid organ where all blood cells including lymphocytes are produced. Each antibody molecule has four peptide chains, two small called light chains and two longer called heavy chains. Hence, an antibody is represented as H2L2. Different types of antibodies are produced in our body. IgA, IgM, IgE, IgG are some of them. Techniques like radiography (use of X-rays), CT (computed tomography) and MRI (magnetic resonance imaging) are very useful to detect cancers of the internal organs.
The site of interaction of lymphocytes with antigen is