The pyramid of biomass in the sea is -

BOD values of three water samples A, B and C were recorded as 20 mg/L, 10 mg/L and 50 mg/L. Which of the sample is/are the most polluted?

Observe the table and answer the given question :

Identify the amino acids with one codon each?

Arrange the following evolutionary human species in order of their appearance on earth from the current to the oldest one.
(A) Homo erectus
(B) Neanderthal man
(C) Dryopethicus
(D) Homo sapiens
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Match List-l with List-II

List-I (Disorders)	List-II (Features)
(A) Colour blindness	(I) 45 with 'XO'
(B) Haemophilia	(II) Trisomy of 21\textsuperscript{st} chromosome
(C) Down's Syndrome	(III) Mutation of certain genes on 'X' chromosome
(D) Turner's Syndrome	(IV) Protein involved in clotting of blood

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The technique shown in the picture is used to:

The factors that affect the Hardy Weinberg equilibrium are:
(A) Gene flow
(B) Genetic Drift
(C) Mutation
(D) Feeding habit
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If k be the kinetic energy and m the mass of a moving particle then the de-Broglie wavelength of the particle is :

Read the following paragraph carefully and answer the given questions.
Certain types of leukocytes (WBC) of our body like polymorpho-nuclear leukocytes (PMNL-neutrophils) and monocytes and natural killer (type of lymphocytes) in the blood as well as macrophages in tissues can phagocytose and destroy microbes. For determining the cause of allergy, the patient is exposed to or injected with very small doses of possible allergens, and the reactions studied. The use of drugs like anti-histamine, adrenalin and steroids quickly reduce the symptoms of allergy. Heroin, commonly called smack is chemically diacetylmorphine which is a white, odourless, bitter crystalline compound. This is obtained by acetylation of morphine. 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. Different species of Plasmodium (P. vivax, P. malaria and P. falciparum) are responsible for different types of malaria. Of these, malignant malaria caused by Plasmodium falciparum is the most serious one and can even be fatal.
Malignant malaria is caused by -

For an AC circuit, a phase diagram shows emf on X-axis, and current I is at angle \( \theta \) to emf. Angle \( \theta \) is phase angle between emf and current. Current I is resolved into two components, \( I \cos \theta \) is along emf on X-axis. \( I \sin \theta \) is along perpendicular direction to emf.
(A) Component \( I \cos \theta \) will draw the power from the source
(B) Component \( I \sin \theta \) will draw the power from the source
(C) \( I \cos \theta \) is called the powerless current
(D) \( I \sin \theta \) is called the powerless current
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A long solenoid carrying a current produces a magnetic field B along its axis. If the value of current is halved and the number of turns per unit length is doubled then the new value of magnetic field is:

\(\int \frac{\cos 2 x-\cos 2 \alpha}{\cos x-\cos \alpha} d x\) is equal to

Arrange the following step of PCR in correct sequence.
(A) Extension of Primer
(B) Annealing
(C) Denaturation of ds DNA
(D) Amplification
(E) Use of DNA polymerase and deoxynucleotides
Choose the correct answer from the options given below: