The type of antibodies that produce the immune response in the presence of allergens like pollen, dust, animal dander etc. is _________.

The first clinical gene therapy was given in 1990 to a 4-year old girl suffering from:

Arrange the following in correct sequence with respect to the events of menstrual cycle:
(A) Development of primary follicle to graafian follicle
(B) Attainment of peak level in luteinising hormone
(C) Release of ovum by graafian follicle
(D) Formation of corpus luteum
Choose the correct answer from the options given below:

When Tt x Tt are crossed, how many percent of the offsprings show a recessive phenotype?

Read the passage carefully and give the answers to the question :
Does the number of species in a community really matter to the functioning of the ecosystem? This is a question for which ecologists have not been able to give a definitive answer. For many decades, ecologists believed that communities with more species, generally, tend to be more stable than those with less species.
According to the International Union for Conservation of Nature and Natural Resources (IUCN) (2004), the total number of plant and animal species described so far is more than 1.5 million.
Which of the following is not a characteristic of a stable biological community?

Which of the following is not a benefit of genetically modified plants/crops?

Which one of the following is not an example of narrowly utilitarian reason to conserve biodiversity?

The Western Ghats have a greater number of amphibian species than the Eastern Ghats. This is an example of :

The kinetic energy of an \(\alpha\)-particle incident on gold foil is reduced to half of its initial value. How does the distance of closest approach change?

Factors that do not affect Hardy-Weinberg equilibrium are:
(A). Genetic drift
(B). Mitosis
(C). Genetic recombination and natural selection
(D). Pleiotropy
Choose the correct answer from the options given below:

A square of side L m lies in the XY plane in a region where the magnetic field is \( \vec{B} = B_0(2\hat{i} + 3\hat{j} + 4\hat{k}) \text{ T.} \) The magnitude of magnetic flux through the square is:

If \(P, Q\) and \(R\) are matrices of order \(2 \times 3,3 \times 5\) and \(5 \times 3\) respectively. Then which of the following are valid?
(A) \(P Q R\)
(B) \(P R Q\)
(C) \(Q R\)
(D) \(R Q\)
(E) \(P R\)
Choose the correct answer from the options given below :

Read the passage carefully and answer the questions
The transition metals and their compounds are known for their catalytic activity. This activity is ascribed to their ability to adopt multiple oxidation states and to form complexes. Vanadium(V) oxide (in Contact Process), finely divided iron, and nickel (in Catalytic Hydrogenation) are some of the examples. Catalysts at a solid surface involve the formation of bonds between reactant molecules and atoms of the surface of the catalyst (first row transition metals utilise 3d and 4s electrons for bonding). This has the effect of increasing the concentration of the reactants at the catalyst surface and also weakening of the bonds in the reacting molecules (the activation energy is lowering). Also because the transition metal ions can change their oxidation states, they become more effective as catalysts.
Which of the following catalyses the oxidation of SO2 in the manufacture of sulphuric acid?