Which one of the following options will express intermediate skin colour in an individual?

Read the passage carefully and answer the questions given along
Our immune system plays the major role in preventing diseases when we are exposed to disease-causing agents. Immunity is of two types: (i) Innate immunity and (ii) Acquired immunity. The human immune system consists of lymphoid organs, tissues, cells and soluble molecules like antibodies. The immune system also plays an important role in allergic reactions, auto-immune diseases and organ transplantation. The primary lymphoid organs are bone marrow and thymus. The secondary lymphoid organs are spleen, lymph nodes, tonsils, Peyer's patches of small intestine and appendix. There is lymphoid tissue also located within the lining of the major tracts (respiratory, digestive and urogenital tracts) called mucosa associated lymphoid tissue (MALT). It is important to note that HIV/AIDS is not spread by mere touch or physical contact; it spreads only through body fluids. AIDS has no cure, prevention is the best option. Adolescence is accompanied by several biological and behavioural changes and surveys and statistics show that use of drugs and alcohol has been on the rise especially among the youth. Factors associated with drug and alcohol abuse among adolescents are a child's natural curiosity, stress, the perception among youth that it is 'cool' or progressive to smoke, media exposure and an unstable or unsupportive family structures and peer pressure. It is best to identify the situations that may push an adolescent towards use of drugs or alcohol, and to take remedial measures well in time.
Find the incorrect statement about human health and disease.

Read the following passage carefully and answer the given questions. During anaerobic sludge digestion, bacteria produce a mixture of gases such as methane, hydrogen sulphide and carbon dioxide. These gases form biogas and can be used as source of energy as it is inflammable. The bioactive molecule, cyclosporin A, that is used as an immunosuppressive agent in organ-transplant patients, is produced by the fungus Trichoderma polysporum. You must have noticed that bottled fruit juices bought from the market are clearer as compared to those made at home. This is because the bottled juices are clarified by the use of pectinases and proteases. Statins produced by the yeast Monascus purpureus have been commercialised as blood-cholesterol lowering agents. It acts by competitively inhibiting the enzyme responsible for synthesis of cholesterol. The BOD test measures the rate of uptake of oxygen by microorganisms in a sample of water and thus, indirectly, BOD is a measure of the organic matter present in the water.
Cyclosporin A, that is used as an immunosuppressive agent in organ-transplant patients, is produced by -

Which organism was used by T.H. Morgan for his experiments ?

Steps to produce transgenic animals are given below. Arrange them in a correct sequence
(A) Selection of proper vector
(B) Introduction of a recombinant vector in host animal cell
(C) Combining of desired gene with the vector using ligase enzymes
(D) Identification and isolation of desired gene
Choose the correct answer from the options given below:

Which of the following show Pleiotropism?

Answer the questions from the figure given below:

Taq polymerase is the preferred DNA polymerase in PCR because :

Consider the following statements
(A) Corpuscular model predicted that if the ray of light bends towards the normal after refraction then the speed of light would be greater in the second medium
(B) In optical fibre, the refractive index of the core is kept higher than cladding.
(C) Diffraction due to clouds is efficient in equal measures for all wavelengths
(D) Light travels faster in glass than in air.
(E) When light reflects from an air glass plate interface, the reflected wave suffers a phase change of \( \pi \).
Choose the correct answer from the options given below :

Arrange the following steps of gel electrophoresis in correct sequence:
(A) Staining the DNA with ethidium bromide
(B) Movement of DNA fragments towards anode under an electric field through agarose
(C) Exposure to UV radiation
(D) Separation of DNA fragments according to their size
Choose the correct answer from the options given below:

A solenoid with \(2 \times 10^4\) turns per meter, diameter 0.1 m , has a coil of 100 turns and 0.01 m radius placed inside. If solenoid current decreases from 4 A to 0 in 0.05 s , total charge through coil is :

If R and S are two equivalence relations on a set A, then

In the course of evolution, life forms on earth tend to move from

A diver at a depth of 1.2 m in clear water (n = 4/3) sees the sky in a cone of semi-vertical angle :